New Roof Insulation Requirements

Add insulation to attic.

New roof insulation requirements.

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. Insulation puts the money back in your pocket by protecting your home from the elements and lowering energy costs. New rules and practical. It is important to note when insulation is on the floor of the attic the space between the insulation and the roof deck must be vented to the exterior.

Whether you re doing a weekend fix or folding it into a bigger home renovation insulating your roof will pay off for years to come. R values can be higher for foam insulation and other advanced insulation systems. Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. Insulation tight to the roof deck i e.

This insulation strategy has not changed in recent code iterations and is not discussed in this article. Minimum insulation r value requirements non residential above roof deck. Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. Roof slopes 9 12 and higher will require a dry in with a minimum of 3 side laps 12 end laps.

Choose feldco roofing for your brand new roof. Cavity fibrous or cellulose insulation can be installed at levels up to r 15 in a 2 inch x 4 inch wall and up to r 21 in a 2 inch x 6 inch wall. Synthetic underlayment may also be used in lieu of a 30 felt provided it is an acceptable substitute to the roofing manufacturer. Insulation entirely above the roof deck directly below the roof deck or both above and below the roof deck.

Insulation must keep a distance of at least 25mm from the roof underlay in all parts of the ceiling roof area. A minimum of a 30 astm felt should be used as an underlayment. Iecc 2015 requirements by climate zone 3. 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.

Insulation on the floor of the attic figure 1. Existing 3 4 inches of insulation. Minimum insulation r value requirements non residential above roof deck. Recommended insulation levels for retrofitting existing wood framed buildings.

The information contained in this document is meant to be used as a quick reference guide for insulation levels across the united states. State applicable energy ashrae zone minimum r value state local. Browse product options or contact your local insulfoam rep to help you quickly pick the best products to simplify your building envelope needs and fit your project budget all with one supplier.