Residential Roof Insulation Requirements

Minimum insulation r value requirements by state.

Residential roof insulation requirements.

Minimum insulation r value requirements non residential above roof deck insulfoam wall insulation products. 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. 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.

R value is a measure of insulation s ability to resist heat traveling through it. 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. 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. With the broadest product offering in the insulation industry and more than 160 years of experience johns manville is your expert building partner.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. 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. Minimum insulation r value requirements non residential above roof deck. 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 higher the r value the better the thermal performance of the insulation. Building swh system has 1 of the following sized to provide 60 of hot water requirements or sized to provide 100 of hot water requirements if building complies with c403 4 7 waste heat recovery from service hot water heat recover chillers building equipment process equipment or combined heat and power system. Insulation level are specified by r value. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.

See the department of energy s doe ranges for recommended levels of insulation below.