Foam Insulation Board Over Windows

Even with all the joints sealed it is still not recommended to have a vertical joint in the sheathing occur over a window head.

Foam insulation board over windows.

Instead you should use zip sheathing asphalt felt or housewrap as your wrb. Insulating boards are just one of the many types of foam insulation. This is an even more dense and more expensive foam board insulation. The first is a foam backed foil that is much like the blue foam insulation used on a home s outer shell.

There are basically two types of reflective insulation that can be used by homeowners today. If your building has outie windows you should use the rigid foam or housewrap installed on the exterior side of the rigid foam as your wrb. Polyiso comes in several thicknesses and is used over house sheathing underneath siding or in attic spaces where its reflective properties are very effective. The layout of the sheathing board over the wall area should be done with this in mind.

Shop at lowe s to find the foam sheeting you need for your next insulation project. For the foam sheathing to be an effective air barrier and provide the drainage plane the joints between the boards must be sealed. Consider using spray foam insulation as well to seal smaller cracks and gaps. It provides an r value of 6 per inch of thickness and often comes foil faced to help reflect radiant heat.

Typically sold as sheet insulation in a standard size of 4 x 8 foam insulation panels can help reduce energy costs get a handle on moisture control and more. Prepare a rough opening for a nail fin window over exterior rigid foam insulation. It comes in sheets the same size as plywood and is easy to work with. Polyisocyanurate is another option coming in as the densest and more expensive option for foam board.

When to use foam board insulation.