Flashing Into Concrete Wall

A wall or siding needs special detailing to prevent leaks and damage where the wall encounters any horizontal surface such as a foundation wall top or a concrete porch slab.

Flashing into concrete wall. Some of these critical locations include the top of walls and parapets at all horizontal obstructions such as over openings beneath sills above shelf angles at the base of walls and in walls at. An alternate base flashing fastening method is to use cleats spaced at 12 o c. To better protect your masonry or roof structure from the water you should install a flashing cap. Press the cap into the mortar and seal by running your finger along.

Additional information for flashing single wythe walls particularly architectural concrete masonry walls and means for providing a higher level of structural continuity at flashings is contained in tek 19 2a ref. The best solution is a preformed or custom bent kick out flashing to divert the water away from the siding. The cap flashing is attached to the base flashing by blind riveting. Copper receiver cast in concrete wall.

In areas where snow may build up add a wide band of peel and stick membrane over the step flashing but under the sheathing wrap as shown. Where the step flashing terminates along a sidewall is a common trouble spot for moisture problems. This detail can be used on either a sloped or a flat roof. The flashing at the shelf angle is inserted into a reglet cast into the concrete and held with lead wedges.

Spread out mortar on the masonry with a caulking gun. Flashing single wythe walls at the ends of bar joists which utilize wall pockets for bearing is shown in figures 8 and 8a. This small piece of metal will cover over the seams and create a way for water to run off. Concrete screws come in 3 16 and 1 4 inch diameter in lengths up to 3 3 4 inches.

They can be used in concrete block and brick. Dissimilar metals should not be in contact. A sheet waterproofing membrane or water resistive barrier is utilized to flash over the back leg of the metal flashing see figure 4. This concrete spandrel condition can be used if there is a large distance from the top of the concrete to the shelf angle.

At the base of walls a sheet metal flashing assembly that extends from the face of the backup wall through the masonry should be used to form a drip outside the wall. Both hex head and phillips head styles are available. Flashing is recommended for all locations where moisture may potentially penetrate into a wall and where the free drainage of water is blocked.