Use Foam Sheets Instead Of Fiberglass Insulation

Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.

Use foam sheets instead of fiberglass insulation.

However the fiberglass can be compressed decreasing the size of the air pockets. The most common insulation materials are fiberglass cellulose and foam. 3 benefits of rigid foam sheathing. For instance a 5 5 inch wall cavity can be filled with 2 inches of foam and an r 13 fiberglass batt as a cost effective system that seals the walls with an r 25 insulation system exceeding u s.

However after reading about the flash and batt method. More effective insulation with r values ranging from 3 6 to 8 0 rigid foam sheathing has much better insulation per inch than other materials i e. These are panels of rigid foam sold in 4 by 8 foot sheets in a variety of thicknesses from 1 4 to 2 inches it is also sold in large bundled panels joined at the ends accordion style for use as an exterior sheathing material. Usually this type of insulation is used in areas where space is limited especially in new constructions where space is maximized for office use or commercial use.

That s not a problem with foam board insulation. It also acts as a good sound barrier because it effectively absorbs sound coming from any direction. The type of insulation you need depends on which type is currently installed and the required r value. In my upcoming master bath remodel i am considering stripping two exterior walls of drywall in order to make them 2x6 in thickness to allow for additional insulation.

It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. My plan was to install 1 rigid foam board against the backside of the exterior plywood sheathing with all gaps sealed with foam and then r 19 fiberglass batt insulation. After that thin furring strips are installed on top of the foam to provide a firm base for the drywall screws and drywall but can you run rigid foam between the studs just as you would do with fiberglass rolls or spray foam. Insulation types include loose fill batts rolls foam board spray board and vapor barriers.

Foam board insulation is easy to use and is a great diy way to add some insulation. When installing fiberglass people often compress conventional fiberglass batts which reduces the product s effectiveness. The correct method of using rigid foam is to run continuous 4 foot by 8 foot sheets of the foam across the concrete basement wall making the rigid foam the de facto wall. In an open cell insulation product like fiberglass the air is trapped inside the fiber.