Fire Rated Roof Underlayment

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.

Fire rated roof underlayment.

Polyglass creates self adhered fire resistant roof underlayment the polystick xfr provides water and fire proofing for high temperature applications including metal roofing. Underlayment must also act as a secondary weather barrier in case the roof fails. 1 4 spans flute widths up to 2 5 8. 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.

Traditionally metal roofs have used standard 30 pound felt paper underlayment. However in some jurisdictions roof assemblies are also required to be fire resistant. In some jurisdictions roof assemblies are required to be fire resistant. 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.

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. R values 28 tested in accordance with astm c518 spannings. I have a few questions about standing seam metal roof assemblies. Firestone clad gard underlayment s provide an ideal moisture barrier between the roof deck and the adjacent metal system.

Versashield fire resistant roof deck protection provides the very best fire protection. 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. 1 4 dens deck roof board. It also can t protect against any water that flows upward toward the top of your roof like ice and water dams or heavy rain and wind storms.

Shop the lifetime roofing system here. Densdeck roof boards can replace any generic type x gypsum board in any roof assembly in the ul fire resistance directory under the prefix. Providing a skid resistant surface nail resealability high temperature resistance corrosion protection weatherproofing during installation and more clad gard is a smart way to protect your metal roofing investment.