R Value For Metal Roofs For Zone 4

Average wall and roof u factor 0 200 in climate zones 1 5 and 0 120 in climate zones 6 8 comply with the roof solar reflectance and thermal emittance provisions for climate zone 1.

R value for metal roofs for zone 4.

Prescriptive roof insulation climate zone 4 example using the tables. Existing attic 3 4 inches of insulation r 38. Metal building roofs first value is for insulation. For over 30 years we have developed and promoted high r value insulation systems in metal buildings.

Add r5 to r6 insulative wall sheathing beneath the new siding. Metal buildings r 19 nc r 19 nc r 6 r 10 attic other r 30 r 38 r 38 nc r 13 nc roofs zone 3 southeast most of ca non residential residential semi heated opaque elements old new old new old new insulation above deck r 15ci r 20 ci r 15ci r 20ci r 3 8ci r 5ci metal buildings r 19 nc r 19 nc r 10 nc. 90 1 2004 2007 iecc 2009 90 1 2010 iecc 2012 iecc 2015 iecc 2018 90 1 2013 2016 cz 0 only for 90 1 2016 climate zone. Department of energy recommended r values for add insulation to attic zone 4 uninsulated attic attic insulation run between r 49 to r 60.

Walls should be between r 19 to r 21 basement walls r13 to r 19. Floors r 25 to r 30. Add r5 insulative sheathing before installing the new siding. Attics and other roofs r value is for insulation installed both inside and outside the roof or entirely inside the roof cavity.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. The top layer of insulation is draped over purlins and compressed when the metal roof panels are attached. R value insulation chart 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. 2 x 4 3 inch 4 38 2 x 6 5 inch 6 88 cedar logs and lumber 1 33 sheathing materials plywood 1 25 inch 0 31 inch 0 47 inch 0 63 inch 0 77 inch 0 94 fiberboard 2 64 inch 1 32 inch 2 06 r value of building materials material r inch r thick ness.

A high r value system is commonly referred to as a double layer system. Steel bands are installed on the underside and perpendicular to the roof purlins. For zones 4 to 8. Two layers of insulation are installed and held up with metal bands to achieve a high r value.

For a very good introductory overview article on r value see r values over at the website of. The map and chart show each region of the u s the subsequent zones and corresponding r values. Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.