Tek 19 5a flashing details for concrete masonry walls ref.
Wall and concrete flashing.
Properly installed wall flashing is critical to your building s health.
This detail can be used on either a sloped or a flat roof.
The cap flashing is attached to the base flashing by blind riveting.
Masonry copings copings constructed with stone precast concrete or masonry should not be considered watertight.
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.
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.
Flashing single wythe walls at the ends of bar joists which utilize wall pockets for bearing is shown in figures 8 and 8a.
In this rogue episode matt will show you a method to waterproof this very tricky transition between a wall and flat concrete slab.
For example the crevice between concrete stairs and the foundation is a common entry point.
This article series provides details of foundation tops building walls exterior trim wall corners and roof wall intersection flashing to prevent leaks water damage.
Another method of flashing a concrete wall is to cast the cap flashing into the wall.
The same problem occurs where a raised porch.
Each method of flashing rough openings has unique advantages.
3 includes such details.
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.
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.
Water can penetrate through transverse joints in the copings or be adsorbed.
Extend the flashing membrane throughout the rough opening and minimum 4 inches onto the face of the exterior wall.
See figures 3 7.
An alternate base flashing fastening method is to use cleats spaced at 12 o c.
Lead flashing is non reactive for the most part but it comes with its own intrinsic challenges because of its toxicity.
Copper receiver cast in concrete wall.
Many builders and designers believe that inadequate vapor barriers are the main cause of moisture problems and wood decay in walls.
660 i or masterseal awb 970 fib.
