Class c roofing provides only light fire protection.
Fire rating for roof materials.
Experience maximum flame spread of 13 feet.
The rating scale is relatively simple and is rated from a to c.
The highest rating meaning the most fire resistant is classified as class a and is able to withstand severe fire exposure.
If the roof deck is combustible such as wood plywood or osb two additional tests must be conducted.
But by including a particular underlying material it can meet the requirements for a class a roof.
Pressure treated shakes and shingles are the most common roofing materials to fall under the class b rating.
The brands consist of an ignited wood lattice placed directly on top of the test specimen.
Roof eaves overhangs are a fire hazard but they can be protected with an encasement of fire resistant material.
Our roof systems are rated by code for external fire resistance under deck exposure and time temperature resistance.
Federal housing administration fha and other lenders require that building roofing materials conform to these standards.
Stucco is often recommended as one of the best materials for boxing in hazardous eaves.
An exterior fire retardant treated shake roof has a stand alone class b rating.
The benefit of purchasing a class a roof is it can withstand severe exposure to fire and has the highest rating compared to class b and class c.
Roofing fire ratings 101 roofing materials go through strenuous testing to determine a fire rating.
Withstand a burning brand measuring 1 5 x 1 5 and weighing 1 4 gram.
We must emphasize however that individual roof components are not rated at all.
Burning pieces of debris and if flames can spread across its surface.
Here are the three rating categories you need to know.
National or model building codes state canadian provincial building codes or fire codes require that roofs must carry at least a class c fire rating or better.
Roofing with a class c rating is able to.
This includes checking if the material is combustible whether it will splinter and generate flying firebrands i e.
A one inch 2 54 centimeter layer of stucco can easily lend a 1 hour fire rating to a wall source.
Common underlying materials include a type 72 roll roofing material also known as 72 pound felt or 72 pound capsheet material and a panelized gypsum product called densdeck.
The class a brand weighs 2 000 grams class b 500 grams and class c 9 1 4 grams.
Some roofing materials such as untreated wood are unrated as they cannot meet even the minimum ratings for fire safety.
Both are burn through tests and the ultimate roof systems rating is the lowest of the three tests.
Class a roofing materials.
The different roofing materials that are available for installation on your home are all evaluated for their fire resistant capabilities.
Roofing systems are rated by realistic fire tests.
