Thru Wall Flashing Roof And Brick

In a typical masonry wall application there are three basic types.

Thru wall flashing roof and brick.

Preventing water leakage through masonry façades in contemporary construction is primarily accomplished by the use of well placed flashings. 1 run membrane down the side of the block and onto the roof underlayment. Step 6 install through wall flashing. However the term through wall flashing is typically reserved for veneer sidings like brick stone and stucco.

It is easy to see why such flashing is commonly referred to as thru wall flashing. Through wall counterflashing reglet counterflashing and surface mounted counterflashing. Masonry walls which are largely composed of brick concrete masonry units cmu cast stone and other related units typically absorb moisture and rain. Sometime the through wall flashing can be the same as the counter flashing.

View all 10 photos play slideshow. True through wall flashing for brick veneer. Flashing generally should extend 8 200 mm above the bottomof the flashingand be fastened to the backup. The flashing must extend up at least 8 weeps spaced a maximum of 24 o c and pea gravel are rec ommended.

Step 7 flashing your chimney. Brick veneer flashing the first detail shows the typical method of flashing a brick wythe. Through wall counterflashing exactly as titled this type of flashing extends through the exterior masonry and ties into the wall cavity. All types of siding employ various flashing details that may behave like through wall flashing to prevent or drain water intrusion but these may be known by a different name counter flashing step flashing apron flashing etc.

And 3 cap the block with membrane overlapping the first two pieces and bridging the gap between the block and the wall sheathing. The lower edge of the flashing should extend about 1 2 beyond the face of the brick and have a downward bend to provide a drip. Properly installed flashing covers the seam between the wall and the roof and directs water onto the roof. 2 fold a vertical strip into the inside corner extending it above the top of the block so that the next layer of flashing will cover it shingle style.

Keep doing this until you run out of stepped blocks. Thru wall flashing originates with a vertical leg in contact with the exterior sheathing tucked or shingled up under the house wrap and a horizontal leg that extends all the way through the masonry to the exterior surface of the wall. Installing through wall flashing correctly particularly on a sloped roof to wall intersection involves a detailed process and requires close coordination between the roofer and the mason. Through wall flashing at the base of the walls should be located 2 or 3 50 or 75 mm above finished grade.

In the northern climates the brickwork should be at least 6 150 mm above grade. In an ideal installation the flashing will extend under the brick veneer so that there is.