Is Tpo Roof Covering Class Of Fire Rating

The slope of the test specimen is preselected and since steeper slopes are more of a challenge due to melting material feeding the fire the rating applies to the maximum slope passed.

Is tpo roof covering class of fire rating.

Class a does not mean grade a roofing systems are rated by realistic fire tests. Class a fire rated tpo membranes and epdm can achieve underwriters laboratories ul class a fire resistance listings by adding fire retardant chemicals during the manufacturing process. We must emphasize however that individual roof components are not rated at all. For example shake roofing with a fire retardant treatment rates class b on its own but achieves a class a rating when combined with specified underlying materials such as type 72 roll roofing material.

The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. If you are looking to install a single ply roofing membrane that will be energy efficient and are evaluating your options consider tpo thermoplastic olefin roofing. Fire ratings for roofs are classified as either class a class b class c or are unrated if a roof covering cannot meet the requirements for any of these classifications. This means that a tpo roof is as uv resistant and as heat resistant as epdm and as heat weldable.

The firestone ultraply tpo roofing systems have also been tested for their wind uplift resistance in accordance with the ueatc eota and fm guidelines resulting in several wind uplift ratings. Comparing ul class a fire ratings with isocyanurate insulation as the substrate the tpo membrane has a maximum slope of 0 5 inch in 12 the pvc is at a 2 in 12 and the epdm achieves a class a at a 0 5 inch in 12 for unreinforced adhered membranes and 0 75 inch in 12 for reinforced mechanically attached membranes. Please contact the firestone codes approvals department when looking for a specific classification or rating. Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance.

Tpo is touted to have the benefits of two of its direct competitors epdm and pvc roofs but without the drawbacks and extra costs.