How To Install Radiant Barrier Insulation In Stud Wall

keeping the heat out of exterior walls

This technique likewise keeps warmth in during cold months.

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Installing a radiant obstacle in the wall surfaces is done just favor the cathedral ceiling technique. When you are trying to block warm from coming in, it is best to have the foil closest to the exterior layer as possible, while still preserving an air space on one side of the foil. If you are remodeling a wall surface that shares exterior sheapoint, read listed below for the typical instructions on a retrofit/reversion application.

If you are doing NEW building and construction, you should really consider utilizing a radiant obstacle home wrap OUTSIDE the wall, in between the brick/stone/siding and exterior sheapoint. For even more indevelopment on home wrap see: Radiant Barrier as a Housage Wrap.


The exterior of a west facing wall can reach over 150º on a hot-sunny afternoon. Generally the wall absorbs the radiant warm from the sun and also heats up. Then, this warmth travels by conduction with a wall surface made of lumber and insulation. The difficulty exists in that standard insulation just slows down heat flow by conduction, it does not speak warmth.

The goal is to force the warmth to CONVERT to radiant develop (radiant heat), so that you can REFLECT it earlier to wbelow it came from. The best way to make the heat transform to radiant warmth is to make it cross an air area. So, we will use they very same method as the Cathedral Ceiling Method except the airspace will certainly be “dead air” rather of ventilated.

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To make this straightforward, think in regards to LAYERS of your wall and also how the heat will certainly circulation through the layers from the exterior to the inside. You want the radiant obstacle to be the initially line of defense versus radiant heat and the consistent insulation to be the second line of defense versus conductive warm circulation.

The Layers of the Wall

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Here are the layers (from the exterior to the interior) as they need to be installed:

Outside airBrick/stone/sidingExterior sheathingAIR SPACE – produced by making use of foam strips to separate foil from exterior sheathing. You MUST have an airarea for a radiant barrier to occupational.kosid.org™ Radiant Barrier Foil – Perforated, not solidStandard insulation via R-value to reduce conductive heat flow. This insulation have the right to be fiberglass, cellushed, foam board or spray foam.Interior Sheetrock/drywallInside of the home/building

One optional technique we favor is to put a layer of either ½” or ¾” foam board BETWEEN the studs and also the sheetrock. You deserve to usage roofing nails via a huge head to hold the foam board in place prior to you finish with your sheetrock. Basically you will install the foam board choose sheetrock and also then install the sheetrock utilizing much longer drywall screws so you have the right to survive the foam layer also.

For Added Performance of the Wall

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For an added air-tight wall, we recommfinish putting a bead of caulk on the confront of the studs before the foam layer (or prior to the sheetrock layer). Be certain to caulk in between the bottom plate of the wall to either the concrete slab or the subfloor to reduce air leakage under the wall as well.

Adding the foam board to the assembly does several things:

adds R-valuehelps air seal the wallreduces thermal bypasssound/noise reduction

You will certainly be amazed at just how bit heat will certainly obtain via a wall surface constructed using this approach.

For similar installation instructions, watch Installing Radiant Barrier in a Cathedral Ceiling to Keep the Heat Out.