Pennsylvania Roof Inslulation Minimum

R value climate zone chart for wall attics and floors.

Pennsylvania roof inslulation minimum.

Recommended insulation levels for retrofitting existing wood framed buildings. If you are using polyisocyanurate insulation you will need 2 layers of 2 6 to meet the r value of 30. Add insulation to attic. Monthly energy and utility savings of 30 or greater can be achieved when compared to the alternative roofing and insulation systems.

Minimum insulation r value requirements by state. Based on the new code reroofing projects must adhere to the minimum r value of 30. Non residential above roof deck this matrix provides the minimum insulation r values required by local and state municipalities. 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.

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. When insulation is exposed during a recover project adding additional insulation may be required to meet the current code requirements. Existing 3 4 inches of insulation. 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.

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. 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. Must meet certain minimum. Many homes have no insulation at all because building codes didn t even require insulation prior to the mid 1970 s.

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. High r value with foam insulation in pennsylvania. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. The cost of an spf roof or insulation system can often be recovered in less than 5 years simply through energy savings alone.

See the department of energy s doe ranges for recommended levels of insulation below. Minimum insulation r value requirements non residential above roof deck.