Flat Roof Fire Protection

E108 defines the following conditions.

Flat roof fire protection.

This could lead to alligatoring which may eventually cause the layer to leak and fail. Also roof deck protection lies flatter for a better looking roof. A new roof is more than just shingles. Pvc membranes are easy to maintain and repair.

Over non combustible roof decks such as steel poured gypsum or concrete only the spread of flame on the top surface of the roof system is evaluated. A rooftop fire can result in ignition of the underlying combustible roof deck if the mass of surfacing membrane and insulation is inadequate to thermally protect the deck from reaching its ignition temperature. For a flat roof system the resistance of the roof to external fire exposure is usually of most interest. This is key to protecting the membrane underneath while also providing sun and fire protection.

Fire protection the building regulations approved document b4 sets out certain specified performance levels of surface finishes on flat roof to control the spread of flame. There must be at least one fire extinguisher for 3 000 square feet of work area. Astm e108 defines fire test methods for roof coverings. Steep roof above 4 12 slope 29 cfr 1926 501 b 11.

No one on a job site can be more than 100 feet from a fire extinguisher at all times. The maximum flame spread is 6 feet for a class a rated roof 8 feet for class b and 13 feet for class c. Surface protection should be light in colour because it will provide good solar reflectiveness and emit absorbed heat more efficiently. Tested against the european standard en 13501 5 the leading flat roofing systems achieve a rating of b roof t4 the best available.

These tests may be conducted at ul inc fm global or any other certified testing laboratory. Low slope roof 4 12 slope or less 29 cfr 1926 501 b 10. Employers must provide the right equipment employers must provide fall protection and the right equipment for the. There are different fire ratings for construction products depending on what is being tested.

A typical flat roof repair costs at least 350 400 and involves locating sources of leaks and patching the seams or holes. Roof insulation fire performance before the latest amendments to adb the key fire consideration for flat roofing was requirement b4 which covered the resistance to fire from the outside of a roof system where achieving f ac to bs476 3 in the past and now b roof t4 gave unrestricted distance to the boundary of the building. A fire extinguisher is needed within 50 feet of anywhere where more than 5 gallons of flammable or combustible liquids or 5 pounds of flammable gas are being used on the job site. Tested to the uk national standard bs 476 3 the leading systems achieve a rating of aa ab or ac aa being the best and where the first letter represents the.

On a built up roof when gravel becomes sparse the asphalt layer underneath can dry and crack under the sun.