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.
Roof and deck insulation.
The bottom layer of a single ply membrane roofing system is the roof deck or substrate.
Structural standing seam metal panel roof systems shall be tested in accordance with astm e1592 or fm 4474.
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.
The first step with roof installation is to prepare the roof deck by getting rid of all dirt dust and contaminants.
R 19 insulation is typically installed in the vented attic application underneath the roof deck.
No insulation is installed on the ceiling or attic floor.
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.
Minimum insulation r value requirements non residential above roof deck is an extremely handy table for state and local jurisdictions in the united states.
The roof deck can be plywood metal concrete or wood planks.
Minimum insulation r value requirements non residential above roof deck.
The right thickness would need to be calculated to move the dew point above the plywood deck where air infiltration is minimized.
Unvented attics have r 38 integrated roof deck ird insulation installed underneath the roof deck.
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.
Structural through fastened metal panel roof systems shall be tested in accordance.
For cathedral ceiling applications make sure there is a minimum of a one inch 1 air space between the insulation and the roof deck.
The document was updated in 2020 and is available on the carlisle syntec website.
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.
Of attic floor area and where at least 30 percent of the free ventilation area.
Rigid foam insulation installation prepare roof deck.
Free ventilation area of attic ventilation for every 150 sq.
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.
Benefits of densdeck roof board include.
Typically this would be achieved by adding polyiso insulation above the plywood 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.
