Based on the new code reroofing projects must adhere to the minimum r value of 30.
Pennsylvania roof inslulation minimum.
R value climate zone chart for wall attics and floors.
Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
State only pa pennsylvania 2015 iecc 4r 30 5r 30 6r 30.
Minimum insulation r value requirements by state.
If you think you re among the 90 of us homes that are under insulated 1 performing a simple insulation inspection will help you determine your insulation needs.
Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.
Must meet certain minimum.
Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities.
All new construction in the usa and canada today must meet certain minimum r values depending on what climate area of the country you live in.
When insulation is exposed during a recover project adding additional insulation may be required to meet the current code requirements.
What does this mean for you.
The cost of an spf roof or insulation system can often be recovered in less than 5 years simply through energy savings alone.
Having the correct amount of attic insulation can help you maintain a comfortable temperature throughout your home and help save money on your energy bills plus prevent major issues like ice dams in the winter.
State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2r 20 3r 20 state local mo missouri 2012 iecc 4r 25.
Existing 3 4 inches of insulation.
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.
Recommended insulation levels for retrofitting existing wood framed buildings.
Add insulation to attic.
If you are using polyisocyanurate insulation you will need 2 layers of 2 6 to meet the r value of 30.
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.
Monthly energy and utility savings of 30 or greater can be achieved when compared to the alternative roofing and insulation systems.
High r value with foam insulation in pennsylvania.
