Intersection Of Wall And Roof Waterproofing

A waterproofing seal installed at the intersection of the roof and chimney and used to prevent moisture penetration.

Intersection of wall and roof waterproofing.

Proper roof wall flashing example. These problem areas include the edges of skylights and chimneys soil stacks vent fans and roof valleys as well as the intersection of the roof deck and dormer walls. Above we show a feeble attempt at flashing and counter flashing at the roof wall intersection of a low slope roof.

Step 2 flashing 2 covers both the apron flashing upstand and the wall underlay. A vertical structure through the roof that ventilates smoke and combustion gases from a fireplace boiler or stove to the outside atmosphere. The most common mistake at this intersection is to allow the metal coping to but up to the wall without the application of termination metal. Anywhere surfaces intersect on a roof is a prime spot for water seepage.

The installer tacked a row of asphalt shingles to the wall caulked their top edge and hoped for the best. Flashing provides the extra protection these spots need. On completion of waterproofing membrane and before undertaking any further activity it shall be tested by plugging the outlets and flooding 50mm above the highest. Yes even flat roof to wall intersections are not being properly done.

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. The omittance of the termination metal leaves an opening at the top of the coping and allows for moisture infiltration at the space between the parapet wall and the structural wall. Unauthorized entry shall be restricted to the waterproofing areas.