Fire Rated Roof Underlayment

Firestone clad gard underlayment s provide an ideal moisture barrier between the roof deck and the adjacent metal system.

Fire rated roof underlayment.

Versashield fire resistant roof deck protection helps to provide the best protection against fire spread and penetration by upgrading the ul fire classification of almost any type of roof. Underlayment must also act as a secondary weather barrier in case the roof fails. However in some jurisdictions roof assemblies are also required to be fire resistant. Traditionally metal roofs have used standard 30 pound felt paper underlayment.

1 4 spans flute widths up to 2 5 8. For roof slopes of four units vertical in 12 units horizontal 33 percent slope or greater underlayment shall be a minimum of one layer of underlayment felt applied shingle fashion parallel to and starting from the eaves and lapped 2 inches 51 mm fastened only as necessary to hold in place. I have a few questions about standing seam metal roof assemblies. R values 28 tested in accordance with astm c518 spannings.

Shop the lifetime roofing system here. Fr 10 is a coated glass fiber mat specifically designed for installation over wood decks or certain combustible insulation. Fr 10 fire resistant slipsheets enhance the overall fire performance of many conventional commercial roof systems including metal roofs. In some jurisdictions roof assemblies are required to be fire resistant.

Densdeck roof boards can replace any generic type x gypsum board in any roof assembly in the ul fire resistance directory under the prefix. Polyglass creates self adhered fire resistant roof underlayment the polystick xfr provides water and fire proofing for high temperature applications including metal roofing. 1 4 dens deck roof board. Synthetic underlayment like an ice and water shield is quite a bit lighter rolls out in large rolls and is made of polypropylene fiberglass polyethylene and.

However contractors now recognize the benefits of synthetic underlayment for metal roofing particularly when it comes to its tolerance to heat and ultraviolet uv radiation. Versashield fire resistant roof deck protection is a key part of the gaf lifetime roofing system 1 and has earned the good housekeeping seal. First class a fire rated assemblies appear to require metal roofing directly over class a rated underlayment over the roof deck with no ventilation space between the metal and underlayment.