How to insulate a loft or roof: install insulation and save on heating (2023)

Around 25% of heat lost from an un-insulated home goes through the roof. The good news is you can easily install roof insulation

So, how much could you save by installing loft or attic insulation in your home? This Uswitch guide makes it easy to find out how to insulate your roof and save money on your energy bills.

Your options for roof insulation will depend on the type of roof you have. Pitched (sloping) roofs are more straightforward and there are more options to choose from, while flat roofs and dormer roofs are more of a challenge to insulate.

If you have a typical house with a sloping roof, or have the top flat in a block and are responsible for the loft space and roof above, you can either choose to have a warm loft or a cold loft:

Cost-wise, there are a range of options available for roof insulation, some of which are relatively inexpensive. Some can be achieved with little DIY experience, while others require more do-it-yourself expertise. Some roof insulation options require specialist equipment and need to be carried out by a professional. Energy-efficiency grants are currently available for cold loft roof insulation.

Warm roof solutions are generally more expensive, but they can provide a greater level of heat retention. Also, you can more easily use the loft to store temperature-sensitive items, as a 'cold roof' can get very hot in the summer.

The simplest and cheapest loft insulation solution is the classic cold loft option. This involves insulating between and over the wooden joists immediately above the ceiling of your top floor. This is generally the only grant-funded option, although it is also fairly easy to do as a DIY project.

If you use your loft for storage, you will need to clear it before any grant-assisted work can be done, as grants, whether partial or 100%, will not cover the cost of clearing a loft. It could also be the perfect opportunity to sort through the items you're storing to see if you still need them.

The recommended depth of blanket style insulation (glass or mineral wool) for a loft is 250 to 270 mm.

If you already have insulation, but it was put in some time ago, it is worth checking the depth, as only a few years ago the recommended depth of insulation was 200mm, and before that it was as low as 100mm.

(Video) Four ways to insulate your home and save £100s on your energy bill - Which?

If you do have existing roof insulation, the first thing to do is to check the depth. If there is only 25mm of insulating material, then this is likely to date back to the 1970s, as this type of insulation was subsidised then. In fact, any insulation that is less then 100mm is likely to be old and is worth disposing of; it is also difficult to top-up older insulation to the recommended depth as modern insulation is sold in standard depths of 100mm and 170mm.

Most typically, especially where insulation has been put in since the 1980s, this will fill the approximately 100mm depth of the joists, and this is easy to top-up. The commonly available, low cost and subsidised products tend to come in either 100mm depth, to go between the joists, and 170mm to be laid (at right angles) over and across the joists, to take the depth up to the recommended 270 mm.

Are there any other jobs that need to be done in my loft to complete the insulation work?

If you are having your insulation installed professionally or under a grant, there are a number of additional tasks that are normally carried out. If you are doing a DIY installation, you mustn't ignore them.

  • Remember to cover the pipes with pipe insulation. Your loft will be colder due to the insulation keeping the warmth in the floors below, so you're more likely to get burst pipes in freezing weather.

  • Insulation should go up the side and over any tanks, or special tank insulation can be used, but you mustn't insulate under any tanks, as without some heat flowing up from below, these are also likely to freeze.

  • If your tank is in a raised position (at least 10cms above the uppermost layer of insulation) then you can insulate the underside of the tank .

  • If there are electric cables in the loft, try to leave these exposed so they can remain cool. If there is enough slack, they can be gently raised and the insulation put underneath. In practice, lighting cables are unlikely to be a problem, especially if you use low energy lightbulbs.

    Shower cables are most likely to need attention, although the fire risk is fairly minimal as showers tend to only be used for short periods. If you see any cables or junction boxes that appear to be in a poor state, you will need to get an electrician to put them right, anyway.

    (Video) How to fit insulation 2022 to the latest Building regulations Part L

  • If you have recessed halogen lights in a room below the loft, they must be protected before they are covered in insulation. Halogen lights give off a lot of heat that is concentrated in a small area, and they pose a serious fire risk if insulation is placed directly against them. Protective cylindrically shaped fire protectors, which are called loft caps or loft covers, are available and it is essential to invest in these before you install your insulation.

  • Don't forget to insulate the loft hatch. This usually involves attaching a block of polystyrene insulation to its upper side, and ensuring any gaps around the side of it are sealed by applying draught proofing strips around the frame

Can I still use my loft for storage once the roof insulation is in place?

If you have the recommended level of loft insulation, you will no longer be able to store items by resting them on the joists. Putting items on insulation weighs it down and reduces its effectiveness, and you won't be able to put boards onto the joists either.

There are a couple of options you can consider though, although these wouldn't be included in any grant funding. You could put in some cross-joists so that any boarding will be able to accommodate the full 270mm of insulation. This is probably a job for a professional joiner. There are some firms which specialise in providing a fully (raised) boarded loft, along with a loft ladder and suitable loft lighting, providing a very convenient storage space.

Alternatively, and probably more cheaply and easily, if you already have insulation in up to 100mm, you can add one of an increasing number of insulation products that have a polystyrene or a wooden layer on top of them. Those with a polystyrene top layer will not be as hard wearing as those with a wood finish, but polystyrene provides the best insulation performance. In theory you won't be able to achieve the performance of 270mm of mineral or glass wool, but you will come close to it. If you want to match or exceed the performance of 270mm of a wool product, then you could consider a warm roof solution.

How does a warm roof solution work?

For a warm roof solution you will need to install insulation in the plane of the roof pitch, that is, immediately below the sloping roof. This will help to avoid your roof-space becoming excessively hot in summer or cold in winter, and will reduce heat losses from your roof. Assuming you don't have a room in the roof, and it is just a 'loft', then you should also implement all the 'cold-roof' insulation measures described above, including any raised boarding as appropriate.

How to insulate a loft or roof: install insulation and save on heating (1)

One important point to remember with a warm roof solution is the need for ventilation immediately below the roof tiles. This is to prevent any condensation build up, or water getting in through or around the tiles. You need to create a space for air to flow parallel to the rafters and immediately under the tiles from one side of the roof (the eaves) to the apex and down to the other side, otherwise the roof structure may begin to rot.

What types of insulation can be used for a warm roof solution?

The materials used to insulate under the roof include batts of mineral or glass wool insulation , held in place by 'battens' of wood attached to and across the rafters. Alternatively, polystyrene slabs , which are sometimes supplied foil-covered, can be fitted. These usually have to be cut to size. Another option is EPS (expanded polystyrene) 'squeeze' products; these are manufactured with a 'concertina' shape and spring-like effect and can be pushed into place.

There is an exception to the ventilation rule, and that's when applying polyurethane spray foams. These solutions, mainly professionally installed but also now available as a DIY measure, can generally only be applied where the underside of the tiles is bare and there is no roofing felt. Spray foam may also provide additional physical strength where a roof is not in the best condition, by holding the structure together. However missing or slipped tiles must be attended to prior to applying the foam insulation.

What insulation solutions are available for a flat roof?

There are three types of insulation solution if you have a flat roof:

The lowest layer with any of these solutions - especially with the cold deck solution - is likely to be a vapour membrane, which is used to stop warm air rising and bringing moisture that will condense somewhere in the roof structure.

The insulation of flat roofs nearly always requires professional assistance, and there are no associated energy-saving grants. A good time to insulate a roof is when it is being replaced, although in many cases a roof that is in good condition can be retro-fitted with insulation.

Do dormer bungalows and houses with attics in the roof space need a different approach to insulation?

Dormer roofs are roofs that contain rooms and can present considerable challenges when it comes to insulation. Dormer bungalows, also known as Dutch bungalows, were built quite widely in the UK, particularly in the 1960s and 70s. They have a conventional lower storey, along with an upper storey, with a smaller floor area, in the roof.

(Video) How To Fit A Loft Hatch Insulation Seal And Save Money On Heating Bills

Three storey town and detached houses have been built in the last few years, as builders attempt to build bigger houses in limited plots of land. Their top storey is often 'in the roof', like an attic. However, due to modern building regulations, they are well insulated. But if you have an older property of this type, Victorian or Edwardian, many of which had attics, you'll need to install insulation; this may not be as straightforward as in a modern house .

How do I insulate the dormer window area of my dormer roof?

Dormer roofs nearly always have 'dormer windows' which are not flush with the pitched roof, but instead have window structures that protrude from the roof. These structures have a front containing the window, triangular shaped side walls (which generally don't have a cavity) and a flat roof (or occasionally a miniature pitched roof). So the advice that applies to insulating windows, walls and flat roofs applies . However, if the window is the full width of the structure, insulated dry lining of the walls may be difficult as it will narrow the area. If this is the case, you may want to explore external cladding, or creatively use curtains to provide insulation.

How do I insulate the 'voids' behind the dwarf walls in my dormer roof?

Perhaps the most unusual aspect of a dormer bungalow is the triangular roofspaces or voids between the edges of the main roof and the walls at the ends of the rooms (these semi-internal walls are known as dwarf walls, because they are often not the full height of the room, on account of the pitched ceiling). With these voids, if there is no existing access, it may be worth putting in a hatch or door because the void is likely to provide a good storage area. If there is access, or access is created, there are two broad options. You can either insulate the pitched roof , or you can insulate the void side of the dwarf wall and the 'floor' of the area within the void .

Insulating the 'floor' of the void (or, the ceiling of the storey below, depending which way you look at it, is straightforward, with a number of options available, and is in effect the same as creating a cold roof solution. If space allows, you can even add raised boarding to create a storage area.

However, in order to insulate the dwarf wall with the same materials, you will need to support the mineral or glass wool, without compressing it. One solution is to use hooks and rot-proof nylon string, but it may be easier to use polystyrene, urethane or another rigid product, in which case insulating the pitched roof is probably going to be the simpler option anyway.

The most challenging aspect of a dormer roof is likely to be pitched (sloping) ceilings. The same challenge will apply to providing better insulation to any loft rooms put in before the current building regulations.

Part of the solution is similar to creating a 'warm roof' (as discussed earlier). But this will be slightly complicated by the need to take down the ceiling to gain access. A vapour membrane is also a likely requirement, to stop moisture, which is naturally generated in an occupied room; without a membrane, vapour would rise and penetrate into the roof and insulation structure, where condensation could occur, resulting in rot.

(Video) How to Insulate Your Roof: Insulating Your Attic to Save Energy and Money

FAQs

What is the best way to insulate the loft? ›

If access is easy and your loft joists are regular, you can use rolls of mineral wool insulation. The first layer is laid between the joists – the horizontal beams that make up the floor of the loft – then another layer is laid at right angles to cover the joists and make the insulation up to the required depth.

What is the best way to insulate a roof? ›

You can use batts, polystyrene slabs, expanded polystyrene or spray foam to insulate your roof or loft space. Spray foam is usually a job undertaken by professionals. Although there are DIY options available in the marketplace. One of the advantages of warm loft insulation is that it is ideal for a flat roof.

What is the cheapest way to insulate a loft? ›

Wool Insulation: The Cold Loft Insulation

They are by far the cheapest options, and are a great solution if you are on a budget, and want to achieve the best all round insulation for your money.

What is the cheapest way to insulate a roof? ›

Glass wool is one of the most common insulation materials for roofs. It is lightweight, has a good insulation value and is quite cheap as well. Glass wool insulation is only possible if there is a roofing underlay.

How does loft insulation help reduce heat loss? ›

The use of more loft insulation can reduce heat loss by reducing the movement of air upwards. The fibres of the insulation can also prevent the trapped air from circulating and causing convection currents.

How much heat does roof insulation save? ›

Insulating the roof can reduce the heat loss by up to 50%, saving energy and saving you money.

Is it better to insulate the roof from inside or outside? ›

Flat roofs are best to insulate on the outside of the roof, which prevents heat loss and reduces energy consumption. By applying insulating material on top of the roof structure, you avoid the risk of moisture damage in the wooden structure. With interior insulation, this risk is greater for flat roofs.

Should I insulate roof or floor of loft? ›

But the best solution is actually to insulate both the attic floor and the underside of the roof. In this way you prevent the heat from the rooms below escaping to the attic rooms above. At the same time, the areas below the roof benefit from increased comfort both during the winter and the summer.

What do you put on the roof to save energy? ›

Some of the most energy-efficient roofing options are clay tile roofs and concrete roofs. These materials are known for their ability to absorb and retain solar energy, so they'll keep your home warm and insulated long after the sun goes down.

How thick should my loft insulation be? ›

Since 2003, current building regulations recommend a depth of at least 270mm (mineral or glass wool) in the loft – use this as a starting point rather than a finishing line to see larger savings. In 1995, the recommended depth was 200mm. Prior to that it was less than 100mm.

What is the best roof insulation for heat? ›

One of the most common and effective ways to insulate your roof is with polyurethane spray foam. This spray-applied plastic is known to be highly effective for sealing any cracks as well as resisting wind and heat.

Should you insulate the underside of your roof? ›

You'll also want to insulate the exterior walls and the underside of the attic's roof. Otherwise, space will suck up a tremendous amount of heating and cooling energy throughout the year, because all of that energy goes right up and out of the roof.

Should I remove old loft insulation before laying new? ›

In most circumstances removing your old insulation isn't necessary and it can actually be quite beneficial to leave it. This is as most insulation will retain its thermal properties so leaving it in place will mean that you continue to benefit from it whilst also having an additional layer of insulation on top!

Is spray foam loft insulation any good? ›

Spray foam insulation is one the most effective ways to insulate your home – it has a higher effective rate of insulation than other options like fibreglass and organic insulation. Because of how effective spray foam insulation is at keeping heat in (and energy bills down), we would always recommend considering it.

Can you put insulation directly on the roof? ›

Putting insulation directly against your roof is ill-advised. There needs to be a gap between the insulation and the membrane, which serves as an additional waterproofing layer under the slates or tiles.

What is the best material to insulate your attic? ›

Fiberglass batt is considered to be the best insulation for attics. Compared to other insulation materials, it is the cheapest and easiest to install. Fiberglass batt is also incredibly energy efficient, as it helps to slow the spread of hot and cold air.

Can you have too much loft insulation? ›

As long as you ventilate your property properly, you can have as much insulation as you like within reason. The trick with loft insulation is to balance the amount of insulation you have with the amount of ventilation necessary to prevent damp. As long as you get that balance right, you should be fine.

What type of insulator prevents heat loss through the roof? ›

Fiberglass – Fiberglass is used for a wide variety of applications, including insulation. This material is one of the most effective types of roofing insulation and comes in a wide variety of shapes and sizes.

What makes insulation more effective? ›

R-Values. An insulating material's resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value -- the higher the R-value, the greater the insulating effectiveness. The R-value depends on the type of insulation, its thickness, and its density.

How do you prevent heat loss in a roof? ›

For roofs, the easiest way to prevent heat loss is through insulation of the ceiling in the loft cavity. It is important to put adequate insulation in the loft or ceiling and to ensure that no gaps are left, especially around hatches, electrical and pipework.

Does insulation in the roof make the house warmer? ›

The short answer, yes, insulating the attic is an effective way to keep your home cooler during the summer months. While it's a given that the insulation in your attic will keep the home warmer during the winter, it isn't immediately obvious that insulation can also help to keep the home comfortable during the summer.

Will insulating attic keep house warmer? ›

So, does attic insulation affect whole-home comfort in the winter? The answer is Yes! Attic insulation is a great place to start if you want your home to stay warm during the bitter cold and keep your family comfortable. This insulation also helps during the hotter months of the year.

Is insulating roof worth it? ›

A properly sealed attic or well-installed insulation in a roof is much more efficient in terms of energy. A roof is a very large surface area, and can easily lose heat during the winter if not properly insulated. Roof insulation will also make your air conditioning significantly more effective in the hot summer months.

Should I insulate roof or ceiling? ›

If you are deciding between insulating the roof deck or the ceiling, Insulating your ceiling should be the priority. Not only is it easier but ceiling insulation is beneficial in a number of ways: Keeps the temperature in the building regulated. Saves on energy costs.

What temperature is too cold to roof a house? ›

Manufacturer Specifications for Cold

It really is too chilly for roofing in cold weather when temperatures fall below 40° F (4° C). Many roofing materials have adhesive properties that require the sun's heat to activate.

Can internal wall insulation cause damp? ›

Internal wall insulation won't cause damp when installed correctly. However it shouldn't be installed if there is a problem with damp as rising/penetrating damp will be seen. This means you will potentially need to reinstall if the problem isn't dealt with.

Should I insulate my attic floor and ceiling? ›

Should you insulate your attic roof? Insulation is a wise choice to increase the energy efficiency of your home. Quality insulation will make it more cost-effective to heat and cool your home, The Department of Energy's estimates range from a 10% to 50% savings, depending on several factors.

Is it better to insulate ceiling or walls? ›

As for attic vs. wall insulation, always go for the attic. The largest pay back will be seen here. You would stop heat loss from natural convection and block solar gain (an increase in heat) in the attic, which can result in energy savings of 30 to 50 percent.

Should insulation be put on roof rafters? ›

Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces. You can add insulation to the floor; the more the merrier. Just don't put it in the eaves. Also, make sure the attic is well ventilated.

How can I keep my energy bill low in the winter? ›

10 ways to save energy this winter
  1. Tackle draughty spots. ...
  2. Upgrade your heating controls. ...
  3. Turn down the thermostat. ...
  4. Replace your inefficient boiler. ...
  5. Keep the heat in with insulation. ...
  6. Insulate pipes to keep water hotter. ...
  7. Reflect on your radiator. ...
  8. Turn off standby.
19 Nov 2020

What shape of roof is most energy-efficient? ›

According to the Louisiana Department of Natural Resources Building Guide, flat or low-sloped roofs often demonstrate better energy efficiency because of differences in insulation. Generally, these roofs have a membrane system, which is applied on top of sheets of rigid insulation.

What color roof is most energy-efficient? ›

White is the best color for energy efficiency because of the albedo effect. With a white roof, or a roof with a color that has similarly lighter hues, the sun's rays are reflected instead of absorbed.

Should loft insulation go to the edges? ›

For ventilation, leave a gap of at least 25mm around the edge of the loft. Do not lay the insulation all the way up to the eaves. If your boiler flue goes through the loft, leave a gap around this as well. Install the first layer to roughly the depth of the joists.

Do you need an air gap for insulation? ›

You MUST have an air gap in order to get either the emissivity quality or the reflectivity quality that you're looking for, otherwise the foil will not work as a radiant barrier.

Should loft insulation be covered? ›

Placing loft boarding over insulation is an easy process and is essential if you want both storage and for your quilt insulation to work at its optimum performance. With the correct products, such as Loft Legs, this is easy and cost effective too.

What is the best insulation for roof rafters? ›

Normally, people use mineral wool or insulation boards to insulate the rafter space. We prefer recycled insulation for obvious reasons. If you are planning to use wool then it is imperative you wear protective clothing, goggles and a face mask, since the wool is an irritant.

What is the safest roof insulation? ›

Glasswool and rockwool insulation products are not hazardous products and are safe to install and use in your home or in other insulation applications for the life of the building.

How can I insulate my house cheaply? ›

Cheap ways to keep your house warm
  1. Draught-proof your home. ...
  2. Insulate your pipework. ...
  3. Invest in a smart thermostat. ...
  4. Change your curtains or blinds. ...
  5. Fit carpets with underlay. ...
  6. Move your furniture around. ...
  7. Increase your roof and loft insulation. ...
  8. Install better floor insulation.

What part of a house should you insulate first? ›

Crawl spaces – You need insulation in both ventilated and unventilated crawlspaces. This will keep pipes protected from cold temperatures in the winter. It helps help keep ductwork at adequate temperatures during each season.

Do you have to tear down walls to insulate? ›

You don't need to tear apart your existing walls to install new insulation. All you need is an expert who knows how to do drill and fill to do the job.

Should insulation in attic be paper up or down? ›

Regardless of whether fiberglass insulation is installed in a wall, attic, or crawlspace; the paper facing should always face toward the inside of the home. That's because the paper contains a layer of asphalt adhesive which prevents water vapor from passing through it.

What are the negatives of spray foam? ›

On the downside, spray foam insulation comes at a price that is considerably more expensive than fiberglass. Often times, spray foam is triple the price of fiberglass and sometimes it can be more. Applying spray foam insulation is also something that is not advised to do by yourself unless it is a very small job.

Can mold grow on spray foam insulation? ›

As a product, spray foam insulation does not attract mold. And unlike wood or metal, spray foam does not rot, rust or deteriorate. This means that an area properly sprayed with foam insulation will never become a food source or a hospitable environment for a mold colony.

Is spray insulation cheaper than rolls? ›

One board foot of closed cell spray foam can cost you double to triple the price of a square foot of fiberglass insulation. But keep in mind that you get much better insulation and air sealing with spray foam.

Does the foil side of insulation go in or out? ›

If you're wondering whether to put the foil side of foam insulation board shiny side in or out, consider whether you want to make the space inside warmer or cooler. If you want to make the space warmer, the foil should face inside so it can reflect radiant heat back into the room.

What is the cheapest way to insulate an attic? ›

Because the simplest and cheapest way to insulate an attic is to add material to the floor. But if the floor is covered in plywood, you can't stuff enough insulation beneath it to do the job sufficiently—not even in warm climates. Plan to pull up the flooring and layer new insulation on top of the old.

What is the cheapest type of attic insulation? ›

Fiberglass: An inexpensive option, fiberglass insulation will cost about $0.35 per square foot, which equates to about $175 in material costs for a 500-square foot attic.

Can too much loft insulation cause Mould? ›

The simple answer to this is no. Loft insulation in itself is not responsible for damp appearing in your property – however, it can be a contributing factor when it comes to the spread of damp via condensation.

How do you fully insulate a loft? ›

If access is easy and your loft joists are regular, you can use rolls of mineral wool insulation. The first layer is laid between the joists – the horizontal beams that make up the floor of the loft – then another layer is laid at right angles to cover the joists and make the insulation up to the required depth.

How thick should your loft insulation be? ›

If you can get into the loft, measure the thickness of the insulation that's already there. Since 2003, current building regulations recommend a depth of at least 270mm (mineral or glass wool) in the loft – use this as a starting point rather than a finishing line to see larger savings.

What is the most efficient heat insulator? ›

The best insulator in the world right now is most probably aerogel, with silica aerogels having thermal conductivities of less than 0.03 W/m*K in atmosphere. of aerogel preventing ice from melting on a hot plate at 80 degrees Celsius! Aerogel has its amazing properties because it's mostly made out of air.

What is the best insulator to keep heat in? ›

Credit: Wikimedia. (PhysOrg.com) -- With its complete lack of atoms, a vacuum is often considered to be the best known insulator. For this reason, vacuums are regularly used to reduce heat transfer, such as in the lining of a thermos to keep beverages hot or cold.

Which type of insulating material is most heat resistant? ›

Without oxygen within the material, this helps to minimise the amount of damage that a fire can cause. So not only is cellulose perhaps one of the most eco-friendly forms of insulation, but it is also one of the most fire resistant forms of insulation. Cellulose has an R-value between R-3.1 and R-3.7.

What is the most important part of a house to insulate? ›

Attic. Arguably the most important space in the home to insulate is the attic. This is primarily because heat naturally rises, which means that the attic will hold a lot of the heat generated in the home. During the winter, having that heat escape through the attic will push up energy bills.

What would be the best type of material to insulate a house with? ›

Blown-in cellulose insulation or loose-fill fiberglass insulation fills cracks and crevices to help prevent heat loss during the winter. Fiberglass is a great option for keeping heat out that won't settle as time goes on. Its fire-resistant properties make it suitable for dry climates.

Where does house lose most heat? ›

6 Areas Of Your Home Where You Lose The Most Heat
  1. Basement Walls and Floors. 20% of home heat is lost through basement walls. ...
  2. Cracks in Walls, Windows and Doors. ...
  3. Poorly Insulated Windows. ...
  4. Framed Walls. ...
  5. Ceilings. ...
  6. Exterior Doors.

What kind of insulation do you use for a warm roof? ›

While PIR boards are one of the best materials to use in warm flat roof insulation, we recommend using loft insulation roll for cold roof insulation.

What material keeps a house warm? ›

1. Fiberglass Insulation. Fiberglass is the most common insulation used in modern times. Because of how it is made, by effectively weaving fine strands of glass into an insulation material, fiberglass is able to minimize heat transfer.

What temp should my attic be in the winter? ›

The ideal attic temperature should be no less than 60 degrees in the winter and no more than 10 to 20 degrees above the outdoor temperature in the summer. If your attic temperature climbs above 130 degrees, you may start running into issues with your energy bill, as well as the integrity of your roof.

What are the disadvantages of loft insulation? ›

Most of the complaints are regarding condensation and damp issues after loft insulation. And while that is possible, usually it is a result of a poorly done job, and not good enough insulation material. Another complaint you might find is pipes bursting in a recently insulated loft.

Is it better to insulate attic or walls? ›

As for attic vs. wall insulation, always go for the attic. The largest pay back will be seen here. You would stop heat loss from natural convection and block solar gain (an increase in heat) in the attic, which can result in energy savings of 30 to 50 percent.

Is insulating your loft worth it? ›

Installing loft insulation can save significant amounts of money on your fuel bills because it improves the thermal efficiency of your home. A quarter of heat is lost through the roof, meaning improved insulation can reduce this amount significantly.

What type of insulation holds in heat the best? ›

Aerogel is more expensive, but definitely the best type of insulation. Fiberglass is cheap, but requires careful handling. Mineral wool is effective, but not fire resistant. Cellulose is fire resistant, eco-friendly, and effective, but hard to apply.

What is the safest loft insulation? ›

Wrap up your loft with soft, natural sheep's wool. Sheep's wool insulation is safe to touch and won't irritate your skin, so you can handle it without wearing protective clothing. It can be used for insulating joists and rafters and is great for absorbing moisture, preventing mould and rot.

Can you put too much insulation in loft? ›

Lofts can't just chip off a layer of insulation, so the need to breathe is far more important. So, can too much loft insulation cause condensation? Yes it can, and it can cause havoc in your home as well.

What is the most important part of your house to insulate? ›

Attic. Arguably the most important space in the home to insulate is the attic. This is primarily because heat naturally rises, which means that the attic will hold a lot of the heat generated in the home. During the winter, having that heat escape through the attic will push up energy bills.

Should I remove old attic insulation before adding new? ›

Expert contractors that specialize in insulation advise that removing old fiberglass insulation is best before installing new cellulose insulation because of possible mildew, mold, or rodent excrement.

Should you insulate attic roof rafters? ›

Should you insulate your attic roof? Insulation is a wise choice to increase the energy efficiency of your home. Quality insulation will make it more cost-effective to heat and cool your home, The Department of Energy's estimates range from a 10% to 50% savings, depending on several factors.

Should loft insulation touch the roof? ›

Whatever form the insulation takes, it is vital that there is an air gap of at least 5cm between the face of the insulation and the roof covering.

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Author information

Name: Dean Jakubowski Ret

Birthday: 1996-05-10

Address: Apt. 425 4346 Santiago Islands, Shariside, AK 38830-1874

Phone: +96313309894162

Job: Legacy Sales Designer

Hobby: Baseball, Wood carving, Candle making, Jigsaw puzzles, Lacemaking, Parkour, Drawing

Introduction: My name is Dean Jakubowski Ret, I am a enthusiastic, friendly, homely, handsome, zealous, brainy, elegant person who loves writing and wants to share my knowledge and understanding with you.