Attic Insulation Zone Map

The amount of attic cavity ventilation is specified by numerous ratios of free vent area to insulated ceiling area ranging from 1 150 to 1 600 depending on which building code is consulted the 1 300 ratio being the most common.

Attic insulation zone map.

By zone as indicated in the map of the united states. Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and. There are many ways to retrofit a home with fiberglass and mineral wool insulation. Add r5 to r6 insulative wall sheathing beneath the new siding.

Insulation iecc sections 303 1 4 and 402 insulation r values are minimum acceptable levels and must be determined according to ftc rule. For over 50 years insulfoam has been enabling building professionals to construct high quality building insulation systems at a minimal cost. Department of energy doe and the international energy conservation code iecc. The map and chart below show the approximate amount of attic insulation you should have based on the zone in which you live.

Chart and image source. R values for walls represent the sum of cavity insulation plus insulated sheathing if any. It also suggests. How much attic insulation you need.

Csl and is the nation s largest manufacturer of block molded expanded polystyrene eps. Whenever exterior siding is removed on an uninsulated wood frame wall. Recommended levels of insulation. Insulfoam is a division of carlisle construction materials a wholly owned subsidiary of carlisle companies nyse.

The map and chart show each region of the u s the subsequent zones and corresponding r values. The second r value for mass walls applies when more than half the insulation is on the interior of the mass. Drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding and. Hawaii is in zone 1 for more specific information check with your town s building department.

Alaska is in zones 7 and 8. Wall insulation whenever exterior siding is removed on an. Add r5 to r6 insulative wall sheathing beneath the new. Zone attic floor wall uninsulated attic existing 3 4 inches of insulation uninsulated floor uninsulated wood frame wall insulated wood frame wall 1 r30 to r49 r25 to r30 r13.

Add r5 insulative wall sheathing beneath the new siding. R value insulation chart find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.