Roof Insulation Sizes

For new construction use rigid boards to insulate slabs and the outside of foundation walls.

Roof insulation sizes.

R value measures how resistant types of insulation are to heat flow. If you think you re among the 90 of us homes that are under insulated 1 performing a simple insulation inspection will help you determine your insulation needs. Having the correct amount of attic insulation can help you maintain a comfortable temperature throughout your home and help save money on your energy bills plus prevent major issues like ice dams in the winter. Foam board insulation is easy to use and is a great diy way to add some insulation.

Insulation is rated by its r value. Some types of thicker foam board insulation are available but they may need to be special ordered. See the department of energy s doe ranges for recommended levels of insulation below. Insulation decreases the amount of heat entering from outside when it s hot and traps warmth inside when it s cold.

Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Install them using panel adhesive or screws. Smaller sizes are also available. They re much lighter and easier to work with than plywood sheets.

It s light weight provides ease of handling. It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches. Rigid roof insulation board.