Minimum Residential Roof Insulation

Minimum insulation r value requirements by state.

Minimum residential roof insulation.

Mineral wool rolls are ubiquitous and cheap meaning a whole roof on a standard home could be insulated to the recommended 270mm with a spend of little more than 200. It s also within the capability of most diyers although not the most pleasant of tasks. If you want a vented roof assembly you need a to make sure that there is room in your attic to install a thick layer of new insulation plus a minimum of 6 inches of space between the top of the insulation and the underside of the roof sheathing and b you will have to install a cupola or doghouse as described in the article. Department of energy lists recommended minimum building insulation levels for each climate zone to promote energy efficient homes.

Zones 2 3 4 5. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Low roof clearance if part of a roof is too low to install insulation that meets the requirements then a less thick insulation product may be used in those low clearance areas.