Figures 5 and 6 show concrete masonry stemwalls with masonry and with frame above grade walls respectively.
Slab on grade concrete block wall sectio.
The following illustration shows you a cross section of what family handyman is promoting in the top view.
The top side view is the wrong way to build.
The bottom side view shows the proper exterior wall on slab placement.
Concrete stem walls that are monolithic with slabs on ground or are otherwise laterally supported by slabs on ground shall be vertically reinforced in accordance with section r611 6 and table r611 6 1 r611 6 2 or r611 6 3 for above grade walls.
Ideally you d want at least 6 inches of slab exposed between the bottom of the siding and the start of the soil.
I use the pca book like rgerk.
Step 2 mix the mortar according to the directions on the package.
Where the unbalanced backfill retained by the stem wall is greater than 18 inches 457 mm the connection between the stem wall and the slab on ground and the portion of the slab on ground providing lateral support for the wall shall be designed.
Set out the first row of cinder blocks without mortar and adjust and move your wall as needed until you are satisfied with the layout.
Once this concrete has cured it will have created a bond between the block rebar and concrete slab forming a single structural unit and the rest of the blocks can be laid as normal.
In some cases additional footings often a thickened slab are necessary under bearing walls or columns in the center of the slab.
Foreword the reinforced concrete design manual sp 17 11 is intended to provide guidance and assistance to professionals engaged in the design of cast in place reinforced concrete structures.
Fill the block cells empty cavities with concrete up to the top of the first course and trim with a trowel.
The major structural components of a slab on grade foundation are the floor slab itself and either grade beams or foundation walls with footings at the perimeter of the slab see figures 4 2 and 4 3.
The first reinforced concrete design manual formerly titled aci design handbook was developed in accordance with the design provisions of 1963 aci 318 building code by aci committee 340 design.
Because the wall is exposed to soil on both sides waterproofing or dampproofing coatings are generally not required.
A cmu wall load bearing or non load bearing on a slab on grade does not load the slab like it would a strip footing.
A stemwall with slab on gradesupports the wall above and often also provides a brick ledge to support an exterior masonry veneer.
Wall system brick veneer cmu backup rigid insulation fluid applied ab.
Draw an outline of the wall on the concrete with chalk and then remove the blocks.
When building stem walls block courses on footings are set below grade and reinforced with rebar before concrete is poured in a continuous pour for a seamless integral slab.
