Insulation Under Siding R Value
R value measures how well certain building insulation materials can resist heat.
Insulation under siding r value. To put the r value of insulated siding into perspective walls with 2 x4 construction are typically insulated in the r 13 to r 20 range depending on the type of insulation selected. If kraft or foil faced insulation is used it should be installed per manufacturer recommendations to minimize air leakage and avoid sagging of the insulation. The thick insulation component helps reduce energy use and lower utility bills. The insulation must also meet the manufacturer s specified minimum weight per sq ft.
The typical r value of this product is r 2 5 to r 3 5 depending on the density of the foam board. The insulation s ability to resist heat flow determines its r value. For the corresponding r value. Add r5 insulative wall sheathing beneath the new siding.
Wall insulation whenever exterior siding is removed on an. For a cavity r value of 24. The insulation does add some r value to a wall but only a modest amount typically estimated at r 2 to r 2 7. Know exactly how much you need with our project calculators.
The higher the r value the greater the insulation performance. Using 2 x6 construction offers the potential for r value up to r 25. Wall 1 insulated with only r 19. Wall 4 r 19 in the cavity plus r12 2 foam board under the vinyl.
That s a remarkable improvement and that will make a tangible difference in how much energy is saved in your home. For more information about how much insulated vinyl siding can save check out this article about cost and return on investment. When determining how much insulation you need don t guesstimate calculate. Wall 2 insulated with high density spray foam at a nominal 4 inches in the cavity.
This amount of r value will make no difference in efficiency. Batt insulation should fill the wall cavity evenly. Wall 3 r 19 in the cavity plus r6 1 foam board under the vinyl. The greater the number the greater the resistance to heat movement and the better insulating factors it has.
What may help though is the taping of the seams and the caulking of all penetrations through the siding once completely installed. Manufacturers often claim a significant reduction in thermal bridging when homes have insulated vinyl siding.