R38 Roof Insulation Thickness

Product thickness in 10 25 in 2 10 25 2 12 in 8 eco options category.

R38 roof insulation thickness. Eight inches of poor quality insulation may have a higher and better r value than one inch of top quality insulation. So you need to know an insulation product s thickness as well as its r value in order to compare it to another product. Of energy says up to r60 is cost effective. Wall insulation whenever exterior siding is removed on an.

10 thick r 38c ecotouch thermal batt insulation prevents moisture damage and help assure long roof life by providing 1 of ventilation air space between the insulation and roof deck. Sized for proper ventilation r 38c ecotouch thermal batt insulation is designed to eliminate r value loss caused by compressing standard r 38 products in 2x12 cathedral ceiling construction. The thickness of your r 38 insulation will depend on the material you have the brand and how it s installed. Foamular xps roof insulation for commercial buildings page 5 foamular xps roof insulation for commercial buildings foamular xps insulation is a rigid foam insulation which meets the needs of today s design professionals for a truly sustainable insulation product.

R38 is the bare minimum in dallas per code iecc 2015 that has been recently adopted in texas. Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and. A recent mckinsey co. Depending on your roof it may be more economical to add foamboard insulation above the roof than spray under the sheathing.

An insulation value of r 38 is at the high end and requires a minimum thickness of 12 inches. To achieve r 38 you can use two layers of. Material type r value cost per square foot cost per square foot per r value fiberglass batt 3 5 12 inches thick 13 0 20 to 0 40 0 02 30 0 60 to 1 00 0 03. Get free shipping on qualified r38 fiberglass insulation or buy online pick up in store today in the building materials department.

An r 38 fiberglass batt should be approximately 12 inches thick while the thickness of cellulose insulation of a finished fitted product will larger. The fiberglass comes in rolls also known as batts which vary in size. Owens corning insulation products help improve thermal performance and control moisture in commercial institutional and. R value does not depend on a single layer of insulation.

As a foil faced polyisocyanurate foam insulation enerfoil tm s r value actually more than doubles.