Roof And Deck Insulation

Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states.

Roof and deck insulation.

State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local mo missouri 2012 iecc 4 r 25 5 r 25 state only mt montana 2012 iecc 6 r 30. Where the metal roof panel functions as the roof deck and roof covering and it provides both weather protection and support for loads the structural metal panel roof system shall comply with this section. For cathedral ceiling applications make sure there is a minimum of a one inch 1 air space between the insulation and the roof deck. Add insulation above the roof deck this approach fits current building science thinking in terms of putting the thermal control layer on the outside of the building structure.

The right thickness would need to be calculated to move the dew point above the plywood deck where air infiltration is minimized. The roof deck can be plywood metal concrete or wood planks. 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. Benefits of densdeck roof board include.

Structural standing seam metal panel roof systems shall be tested in accordance with astm e1592 or fm 4474. Shown to withstand delamination deterioration warping and jobsite damage more effectively than other roofing membrane substrates such as paper faced gypsum board fiber board and perlite insulation. R 19 insulation is typically installed in the vented attic application underneath the roof deck. Insulation with a thermal resistance of at least 0 85hr ft2 degree f btu or at least 3 4 inch air space is added to the roof deck over an attic or 7.

In climate zones 10 12 and 13 with 1 sq. Structural through fastened metal panel roof systems shall be tested in accordance. Rigid foam insulation installation prepare roof deck. The bottom layer of a single ply membrane roofing system is the roof deck or substrate.

The document was updated in 2020 and is available on the carlisle syntec website. Of attic floor area and where at least 30 percent of the free ventilation area. The radiant barrier except for radiant barriers laminated directly to the roof deck shall be installed to have a minimum gap of 3 5 inches between the bottom of the radiant barrier and the top of the ceiling insulation to allow ventilation air to flow between the roof decking and the top surface of the radiant barrier and have a minimum of. Typically this would be achieved by adding polyiso insulation above the plywood deck.

Unvented attics have r 38 integrated roof deck ird insulation installed underneath the roof deck. Minimum insulation r value requirements non residential above roof deck. Free ventilation area of attic ventilation for every 150 sq. See the department of energy s doe ranges for recommended levels of insulation below.