Required Roof Insualtion

Framed wall insulation must meet or exceed r 13.

Required roof insualtion.

Install roofing underlayment flashing and cladding as per best practices. Continuous insulation zones ashrae 90 1 ashrae 189 1 igcc ibc iecc 2004 2007 2010 2013 2016 2009 2011 2014 2012 2015 2009 2012 2015 0 25 1 15 20 2 15 20 25 3 15 20 25 4 15 20 302535 5 15 20 302535 6 15 20 3035 7 15 20 3540 25 8 20 3540 25 minimum r value non residential above roof deck. Add insulation to attic. 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.

Nailbase must be vented in high snow load areas. Recommended insulation levels for retrofitting existing wood framed buildings. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. R 38 shall be deemed to satisfy the requirement for r 49 wherever the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves.

Minimum insulation r value requirements by state. Insulation on the floor of the attic figure 1. Residential requirements for insulation are divided by the location in the home. However there is an exception.

Building and energy codes almost always specify a required minimum r value for exterior walls and roof assemblies with above deck insulation so the minimum required r value in your local jurisdiction is something that you need to take into account when planning a building project. Iecc 2015 requirements by climate zone 3. 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. Existing 3 4 inches of insulation.

Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. Minimum insulation r value requirements non residential above roof deck. Rigid insulation layers exterior to existing roof sheathing must provide sufficient thermal insulation r value to control condensation risk see climate specific guidance. The 2015 irc requires r 49 insulation for ceilings with attic spaces.

These energy code r value requirements change from state to state and even city to city. Ceiling insulation must be much higher at r 30 and a raised floor must be at least r 13. Insulation tight to the roof deck i e. For block walls interior insulation must meet or exceed r 7 8 and exterior insulation must be r 6.

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. Install nailbase for cladding.