Concrete Wall Flashing

Although flashing is the primary focus of this tek it should be understood that the role of vapor retarders air barriers and insulation are also important elements to consider for any wall design as the performance of the entire system can be dependent on.

Concrete wall flashing. Bill palmer an engineer and the editor in chief of concrete construction a sister publication of jlc responds. Moisture barrier between the sole plate the concrete slab. Sole plates or sill plates are the first pieces of framing lumber placed in home construction. An alternate base flashing fastening method is to use cleats spaced at 12 o c.

Each method of flashing rough openings has unique advantages. Pinhole free flashing membrane with a thickness of 12 30 mils. Extend the flashing membrane throughout the rough opening and minimum 4 inches onto the face of the exterior wall. Another method of flashing a concrete wall is to cast the cap flashing into the wall.

Masonry copings copings constructed with stone precast concrete or masonry should not be considered watertight. Tek 19 5a flashing details for concrete masonry walls ref. 3 includes such details. The aluminum flashing shown in horgan.

The cap flashing is attached to the base flashing by blind riveting. This detail can be used on either a sloped or a flat roof. What is the best type of flashing to use with concrete. Water can penetrate through transverse joints in the copings or be adsorbed.

Seeing doug horgan s photos of corroded aluminum flashing in repairing a stone patio over a living space jul 16 left me concerned about using metal flashing with concrete. For example the crevice between concrete stairs and the foundation is a common entry point. See figures 3 7. Copper receiver cast in concrete wall.

Properly installed wall flashing is critical to your building s health. Many builders and designers believe that inadequate vapor barriers are the main cause of moisture problems and wood decay in walls. These plates must be made of pressure. 660 i or masterseal awb 970 fib.

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. Drip edge metal valley flashing dormer chimney and kick out flashing shed water away from the connections between roofs walls chimneys and other building assemblies this collection of 18 articles animations and videos identifies the critical roof flashing areas illustrates durable roof flashing details and shows how to flash roofs. Flashing single wythe walls at the ends of bar joists which utilize wall pockets for bearing is shown in figures 8 and 8a. If the window or door is near the base of the wall the flashing should form a continuous envelope and be connected to the adjacent wall flashing.