Intersection Of Wall And Roof Waterproofing

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.

Intersection of wall and roof waterproofing.

Step 2 flashing 2 covers both the apron flashing upstand and the wall underlay. Proper roof wall flashing example. Unauthorized entry shall be restricted to the waterproofing areas. Yes even flat roof to wall intersections are not being properly done.

A waterproofing seal installed at the intersection of the roof and chimney and used to prevent moisture penetration. 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. Anywhere surfaces intersect on a roof is a prime spot for water seepage. Figure 79a flashing the junction step 1.

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. 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.

Typical waterproofing details of foundations above the roof slab shall be followed as per approved shop drawing. 82 build supplement flashings section 4 roof wall intersections figure 79b step 2.