Insulation R Value For Crawl Space Ceiling

Therefore how well insulation performs is more accurately measured by its total r value than by inches of thickness.

Insulation r value for crawl space ceiling.

Whether the floor of your crawl space is bare earth gravel or concrete it is going to exude moisture. This type of insulation allows for conditioned air to be introduced into the crawl space. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. However the insulation needs to be treated with a fire retardant.

Insulation should be between any area that separates a heated space from an unheated space. 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. Insulation level are specified by r value. R value is a measure of insulation s ability to resist heat traveling through it.

Mixed with moderate heating and cooling requirements. It will keep out all the outdoor air. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need.

The table below shows what levels of insulation are cost effective for different climates and. A double layer is recommended. Most areas in the country will require insulation on the foundation walls equal to or greater than an r value of 5. R values per inch vary with different types of materials.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. This type of crawl space also allows insulation with an r value of 19. The higher the r value the better the thermal performance of the insulation. You could opt for thick insulation with a radiant barrier and an r 11 value.

A 4 by 8 foot sheet of 2 inch thick expanded polystyrene insulation r value 7 7 is 26. It will keep out all the outdoor air. Add a vapor barrier. If you have an unheated garage with living space above the garage ceiling should also be insulated in the same manner.

Recycled glass or sand that s melted and spun into fibers. Insulate your crawl space walls and the ceiling for maximum climate control. Recommended home insulation r values.