Parapet Wall Roof Flashing

A copper receiver holds the counterflashing at its top edge.

Parapet wall roof flashing.

At the edge of these roofs parapet walls are commonly found and are vulnerable to leaks if not flashed correctly. The examples shown indicate styles commonly used. Water from either of these locations may bypass flashing and enter the backup wall directly. Wsrca suggests for walls 24 inches and taller that wall cladding be considered in lieu of membrane wall flashings per detail tp 8a.

This detail may be used where wall heights are 24 48 inches above roof surface. Water may be entering the coping at the top of the parapet or entering the roof side of the parapet. Mortar bridges below the through wall flashing may be allowing water to cross the cavity into the backup wall. Parapet wall caps are custom fabricated to any measurements and it usually measure 10 in length but can also be bent in 12 lengths.

Attaching flashing to a parapet wall requires basic sheet metal tools and knowledge of sheet metal or copper soldering. As a roof ages the roofing seams begin to separate often beginning where the flat roof meets the parapet wall. Copper flashing is locked into this edge and extends at least 8 up the wall. The flashing of the head of a batten seam roof at a wall is shown in this detail.

Whether you prefer a simple screw through or more complex hidden fastener style we are able to build what you require. The top of the roof pan is formed into a bread pan whose upper edge is just above the finished batten. On walls greater than 36 inches high membrane wall flashing sheets are suggested to be strapped i e installed vertically. Utilizing your own custom design we will fabricate a coping flashing to cover and protect your parapet wall design from high grade aluminum or steel sheets.

This short repair video shows how to tie in a flat roof to a parapet wall with an l flashing using only surecoat roof coating and poly mesh.