Wui Approved Roof Vents

Do not use fiberglass or plastic mesh because they can melt and.

Wui approved roof vents.

Cbc 708a crc r337 8. Cover all vent openings with 1 16 inch to 1 8 inch metal mesh. Build your roof or re roof with materials such as composition metal or tile. When a wildfire nears and the vent reaches the critical temperature the intumescent coating on the matrix structure expands creating an insulating barrier from fire and embers.

These patented attic vents are accepted for use by many local fire officials for installation in wildland urban interface wui zones. Chapter 7a says that vents must resist the intrusion of embers and flames or that they shall be protected by corrosion resistant noncombustible wire mesh screen with 1 4 openings. Vents in soffits eaves or overhangs areas shall be an approved venting device only. 1 8 mesh is also allowed and is preferred based on recent research and experience and knowledge gained in large wui wildfires.

For clay and concrete tile as well as composition slate and shake roofing applications. As seen on this old house vulcan vents are designed to be fire and ember safe. O hagin universal direct deck attic vents this attic vent provides maximum net free ventilation area nfva and is designed for mop in or dry in applications using tile shingles slate or shake. Block any spaces between roof decking and covering to prevent embers from catching.

Combustible vents on top of roofs may be covered with this material to comply. An ember catching screen blocks dangerous embers during ember attacks long before the fire arrives. Each vent shall not exceed 144 square inches in area and shall be covered with noncombustible corrosion resistant mesh with openings not to exceed inch or shall be designed and approved to prevent flame or ember penetration into the structure. Vents on homes create openings for flying embers.

B o hagin offers attic ventilation products designed for use in wildland urban interface wui areas 1 o hagin fire ice line of attic ventilation products a. The vulcan vent has been approved by the california state fire marshal. Ventilation openings for enclosed attics enclosedeave soffit spaces enclosed rafter spaces formed where ceilings are applied directly to the underside of roof rafters and underfloor ventilation openings shall be fully covered with metal wire mesh vents other. These vents offer superior design and construction as well as being miami dade county.

Ventilation openings on the underside of eaves are not permitted unless a sfm approved vent is installed or eaves are fire sprinklered or vent is 12 feet above a walking surface or grade below. There are separate testing procedures for the different areas of the home affected by chapter 7a of the california building code but all are directed towards determining if the material is fire and ember resistant.