Any building has to have a permit and that requires a drawing or plan. It is important to identify all the dimensions for the wall. The openings for the doors and windows must be placed exactly. The corners of the wall are very important to the placing of the structure and must be laid out exactly.
Taking measurements from the foundation or floor plan, and transferring those measurements to the foundation, footing or floor slab is the first step in laying out the wall.
Every block wall requires a footing that is built below the frost line to prevent heaving in the winter. The footing should be twice as deep as the thickness of the wall and twice as wide. Footings in wet soil are required to be twice the width of normal footings tp provide the necessary support.
If you are building a wall for a home addition, garage or other structure, it is important to be able to read construction drawings to identify all the dimensions for the walls which are given on the floor plan and elevation. The walls are to be laid out the same as on the floor plan, with all measurements followed exactly. The openings for doors and windows must be placed exactly. It is important that the corners be set on the foundation exactly as given on the detail drawing on the foundation plan. Taking measurements from the foundation or floor plan, and transferring those measurements to the foundation, footing or floor slab is the first step in laying out the wall.
Before starting to lay the blocks, drive stakes into the ground and build a form at each corner. These stakes and forms can be made from scrap pieces of wood used on the job. Locate the exact corner by stretching lines from one corner form to the other. The exact corner will be the point at which the two lines cross. Drop a plumb bob down from each line, both at the corner point where the lines cross and at positions about 2′ out in each direction.
Corners and lead blocks are generally built 4-6 rows high, with each course being stepped back one block from the course below, creating a pyramid effect. The wall alignment, plumb and level should be checked on these corners before completing the wall. If everything checks out fine, it is now time to fill in each course between the corners.
Because they can be adjusted in size slightly, mortar joints provide some layout flexibility. While the ideal mortar joint is 3⁄8 inch wide, masons routinely shrink joints to as small as 1⁄4 inch or stretch them to as large as1⁄2 inch. Joints that fall out- side this range are unsightly and, with a few small exceptions, prohibited by most building codes.
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