Residential Roof Insulation Requirements

Insulation level are specified by r value.

Residential roof insulation requirements.

Minimum insulation r value requirements non residential above roof deck insulfoam wall insulation products. The higher the r value the better the thermal performance of the insulation. The table below shows what levels of insulation are cost effective for different climates and locations in the home. The information contained in this document is meant to be used as a quick reference guide for insulation levels across the united.

R value is a measure of insulation s ability to resist heat traveling through it. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. Minimum insulation r value requirements by state. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local.

The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. Our building science knowledge and network of skilled contractors can help you meet or exceed new title 24 requirements providing more comfortable and energy efficient homes. See the department of energy s doe ranges for recommended levels of insulation below. Minimum insulation r value requirements non residential above roof deck.

With the broadest product offering in the insulation industry and more than 160 years of experience johns manville is your expert building partner. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. For over 50 years insulfoam has been enabling building professionals to construct high quality building insulation systems at a minimal cost.

Exterior roof complies with table c402 2 11 commercial cool roof or insulation of r 15 if present attics above insulation are vented and attics below insulation unvented roof surface slope of not less than unit vertical in 12 units horizontal i e 1 48 or 2 1 code says 21 tropical zone.