Flat Roof To Wall Flashing Detail

Roof wall flashing architectural detailing this design guide has been prepared to assist architects and architectural draftspersons with the design and installation intricacies of detailing roof and wall flashing for metal cladding.

Flat roof to wall flashing detail.

Roof flashing is a thin material usually galvanized steel that professional roofers use to direct water away from critical areas of the roof wherever the roof plane meets a vertical surface like a wall or a dormer. Flat roof flashing this could virtually be any type of flat roof the upstand of the flat roof covering is overlapped by the drop of the flashing. The metal flashing is formed with a hook edge and cleated on 12 centers. Flashing is installed to surround roof features such as vents chimneys and skylights.

Lead flashing maximum length. Tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape. The flashing extends up the wall at least 4. 3 12 flashing large roof penetrations 17 3 13 flashing small roof penetrations 19 3 14 expansion 20 3 15 standard roof flashings 21 3 16 non standard roof flashings cappings 24 3 17 box gutters 25 3 18 barge gutters and capping 26 4 0 typical wall flashings 27 4 1 cladding orientation 27.

Here is an attempt though maybe not a very good one to make the roof flashing serve also as a through the wall flashing with a tile roof. The flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas. N at roof to wall intersections see figure 1. Ideally this should be 150mm or a minimum of 75mm again common sense and exposure applies.

N use step flashing that has a 2 to 4 inch lon ger vertical leg than normal. Do not seal housewrap or building paper to step flashing. Same type of metal as the flashing material. This collection of 18 articles animations and videos identifies the critical roof flashing areas illustrates durable roof flashing details and shows how to flash roofs right in the real world.

Quality of a finished installation is dependent on good detailing. The flat roofing material must go up the wall a minimum of 12 or up the wall and over the top of the wall if the wall is less than 12 high. N tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape. Use step flashing that has a 2 to 4 inch longer vertical leg than normal.

Size up the job. Flashing joints are lapped 6 in the direction of water flow.