Drywall is considered a suitable building material for interior walls, but its main purpose is not to insulate. To make a significant difference in the transfer of heat flow, you must include insulation together with the installation of drywall. Yes, drywall helps to insulate to a minimum. Although each building material has a certain resistance to heat flow, also known as the R value, several of them are more effective than others.
For example, the half-inch thickness of drywall has an R value of approximately R-0.5.A 4-inch thick wall cavity can increase its R value to approximately R-15 by adding insulation to it. Regular drywall is a poor insulator. This is because half an inch of drywall only has an R value of 0.45, which is poor. Drywall is mainly composed of compressed gypsum and paper for structural integrity.
For all intents and purposes, air will not flow through it if properly installed, however, the importance of being airtight is to control the formation of moisture and condensation within walls. This is where the vapor barrier comes into play. Drywall thermal insulation protects the home from moisture, drafts and creates a pleasant microclimate. There's more to this additional layer than you'd imagine.
Make sure you're covered and learn more about thermal insulation now. It is possible to insulate existing walls without discarding drywall by using loose filler cellulose. Drywall cannot match the beauty and warm decorative effect of the patterns that wood grain naturally gives to finished plywood boards, especially plywood. The installation of drywall also requires additional steps, such as mud, sanding and taping, something that causes the plywood installation is a relatively less cumbersome process.
This is because all you need to repair existing drywall is drywall mud, an all-purpose razor, and some adhesive tape. The time has come to think about the many options for insulating drywall now that you understand its importance. And while sanding and patching is often necessary to give drywall an attractive finish, it's not mandatory. For example, the image below shows a wall composed of four layers of ½ inch drywall on the inside for aesthetic purposes, actual insulation between the uprights, a ¾ inch plywood coating on the outside, and wood cladding as the final exterior finish.
In cold climates, vapor barriers (such as polyethylene) must be installed between the drywall and the insulation, since the interior tends to be more humid than the outside. This won't help you with the moisture inside the wall because the moisture resistance properties of drywall have to do with the green paper on the front face of the drywall. Elsewhere, I read that air doesn't move through most solid objects (concrete blocks and masonry in general are notable exceptions), so since drywall isn't mentioned as an exception, that seems to confirm that they should work well. Drywall and siding limit convective heat transfer, while fiberglass block insulation inhibits conductive heat transfer in typical wall construction.
This insulation layer will do its job from the inside of the walls together with drywall and some other materials.
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