Does Insulation Come Before Exterior Or After?


After the wiring is in place, the insulation can be laid in. Most homes are insulated using batt or roll insulation. Other options, such as spray foam or loose insulation, are also a possibility, but in all cases the insulation needs to be installed after the wiring is done.


The answer, happily, is yes. In fact, the two products combined make your home super-insulated from outside wind and weather. If you choose to install house wrap with rigid foam, generally, it should go under the insulation, not around it.

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Frequently Asked Questions

Does it matter which way you install insulation?

The first layer should have the facing against the drywall to act as a vapor barrier. (The general rule for insulation is that the facing always goes toward the conditioned space.) The second layer of insulation should be unfaced so that moisture doesn't collect between the layers.

Where do you first insulate?

If you are looking at adding to an existing insulation, the attic is your best first step. Current codes are looking for a minimum of R60 which is about 2 feet of fiberglass in an attic area. For not a lot of money, you can have loose fiberglass insulation blown into your attic area through your attic access.

What does insulation look like on outside of house?

Our partners at Be Constructive apply a layer of 10cm thick expanded polystyrene to the outside of the exposed walls of your home. The insulation boards are stuck to the walls initially with concrete adhesive and then reinforced by mechanical fixings and plastic caps.

Do you wire or install insulation before you drywall?

Wiring should be installed before any insulation. When building a home, everything needs to be done in the correct order. For instance, after the framing is complete and the exterior walls have been put up, you need to consider the inside of the wall cavities before you drywall the interior.

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