Is it better to insulate walls or roof?

Wall insulation, always go through the attic. The biggest return will be seen here.

Is it better to insulate walls or roof?

Wall insulation, always go through the attic. The biggest return will be seen here. You would stop heat loss by natural convection and block solar gain (an increase in heat) in the attic, which can result in energy savings of 30 to 50 percent. You will not see such a big return on investment when insulating walls.

A properly insulated basement can save you money on heating and provide a dry and comfortable living space. In most cases, a basement with insulation installed on its outer walls should be considered a conditioned space. Even in a house with a basement without air conditioning, the basement is more connected to other living spaces than to the outside, making basement wall insulation preferable to ceiling insulation. Insulation is a one-time cost that makes your home more comfortable throughout its lifespan, without having to spend another penny.

But life, and our budget, don't always allow us to both. If you had a very tight budget and you had to choose, you would first insulate your roof. Installing ceiling insulation can save about 35% on heating and cooling energy. Foam blocks airflow, needs no vapor barrier, and has a higher R-value per inch than loose fill or blocks, so you get more protection with less depth.

With spray foam, unlike loose fillers or wadding, you should cover the vents of the soffit (they are not necessary to keep the roof cool). Then cover the foam with drywall as needed for fire safety. The biggest difference between these two types of insulation is where they are installed. Attic insulation is installed on the roof plane, while roof insulation is installed on the roof slope itself, above and below the rafters.

Covering the ventilation grilles of the soffit with padding or loose wadding, which can happen if insulation is placed along the eaves, is a big no-no. Another option may be to densely pack the loose-fill insulation between the floorboards and the ceiling below, at the same time making sure that an air barrier is installed. For those who are not in the field of insulation, the differences between attic insulation and roof insulation can be difficult to distinguish. 1 ½ or 2 ½ story homes have attics with several small parts that can make it difficult to access, air seal and insulation.

In an ideal world, homeowners would have adequate insulation in the attic and roof, but in the real world, that is not always feasible. If there are obstructions above the joists, as in the case of a truss roof, it may be easier to place wadding insulation in the joist spaces and then use loose-fill insulation to create a full layer of insulation above the joists and around all obstructions. For new construction or if you are renovating, you may be wondering if you should insulate the roof or walls first. Do not hesitate to remove existing insulation where leak sites may be found and seal these areas.

To get the target R-value of the product you chose, use the number of bags your calculations showed you needed to insulate your attic never less. If your attic has enough insulation and adequate air sealing, and your house is still drafty and cold in winter or too hot in summer, you will likely need to add insulation to the exterior walls. We hope that you now better understand the differences, advantages and disadvantages of roof insulation and attic insulation. Also install an air barrier to prevent cold air from the garage from shorting the insulation under the subfloor.

Optimal insulation materials and foundation placement vary by weather, so consult a local insulation professional if you are planning a new home. If radon is a problem in your place of residence, you will also need to consider radon and radon resistant construction techniques when researching foundation insulation options. A ventilation baffle must be installed between the insulation and the roof deck to maintain the ventilation channel. When re-roofing, remove the roof finish and siding, seal the air and fill the cavities with insulation, and then install the new roofing materials, including a protective frost membrane.

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