Brick Ledge Block Foundation
Excavating trench beside the foundation or concrete slab.
Brick ledge block foundation. Residential foundation 6 0 core knee wall 4 0 high x 4 units 19. I also recommend building a brick ledge into the foundation. Damage occurs from slightly above ground level to roughly the frost line. Often the wall is bulged inwards into a basement or crawl area as well as showing horizontal and step cracking and loose bricks over the bulged area.
An alternate is to use an 8 block and a 4 block for the top course s of block sitting on the footing. Often when people visit the site of their new home before the foundation is poured they will ask why there is a board going around where the house will be constructed but not all the way around. If the bridge ledge is constructed separately then the construction procedure includes. 25 mm clear air space between the masonry and backup to ensure an open drainage cavity.
This provides an excellent second line of defense should the flashing have defects. Place grade at the bottom of the trench and level it properly. The top edge of the foundation must be at least 6 inches above grade. A 2 brick ledge is not enough for a brick that is 3 5 thick normal 4 modular brick.
Common trench depth of 15 24cm and width of 30 48cm is used. Frost and earth loading can push a below grade brick foundation wall inwards. This will provide a 3 5 8 wide ledge for the brick. 25 mm air space is considered appropriate if special precautions are taken to keep the air space clean such as by.
For this case note that masonry design codes typically require a minimum 1 in. Cracks and bulges in brick foundation walls. When using a brick ledge don t seal the joint between the bottom of the flashing and the concrete. A stemwall with brick ledge is shown in figure 6.
Trusses 18 0 high wall x 18 units 18.