Drywall, for example, has an R value of approximately R-0.5 for its half inch thickness. This is minimal considering that filling a 4-inch thick wall cavity with insulation increases the R value to approximately R-15.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. Materials that stop air leaks are called air barriers and are best placed next to insulation. Because drywall is frequently installed against insulation, it can be an effective air barrier.
Seal the foam box to the strut and then place a layer of putty on the perimeter face to seal it against the back of the drywall. And while sanding and patching is often necessary to give drywall an attractive finish, it's not mandatory. To create a good air barrier, the drywall must be hermetically attached to the frame and all possible air leakage points around the holes cut in the drywall must be properly sealed. This is because all you need to repair existing drywall is drywall mud, an all-purpose razor, and some adhesive tape.
But it's not often that drywall is hung that isn't full of holes for electrical boxes, ducts, windows and doors. 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. It is possible to insulate existing walls without discarding drywall by using loose filler cellulose. Drywall installation also requires additional steps, such as mud, sanding and taping, which makes installing plywood a relatively less cumbersome process.
Drywall and siding limit convective heat transfer, while fiberglass block insulation inhibits conductive heat transfer in typical wall construction. The time has come to think about the many options for insulating drywall now that you understand its importance. Drywall cannot match the beauty and warm decorative effect of the patterns that wood grain naturally gives to finished plywood boards, especially plywood.