EDT 51-Floor Plan Design 1

Weekend Cabin Retreat ProjectWeekend Cabin Retreat ProjectBasementsBasements

Sacramento City CollegeEDT 51

Kenneth Fitzpatrick, P.E.

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Wood Foundation-BasementWood Foundation-Basement

The site is excavated to the regular depth.

Plumbing lines are installed Foundation drainage is installed. A basement sump should be

installed in poorly drained soils or where ground water is a problem.

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Wood Foundation-BasementWood Foundation-Basement

The bottom of the excavation is covered with 6 to 8 in. of porous gravel or crushed stone.

This material is carefully leveled. Pressure-treated foundation

footing plates made of 2 x 8 2 x 10 2 x 12

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Wood Foundation-BasementWood Foundation-Basement

The foundation walls (2 x 4 or 2 x 6 stud frame) are erected on these plates.

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Wood Foundation-BasementWood Foundation-Basement

Nails and other fasteners should be made of silicon bronze, copper, or hot-dipped zinc-coated steel.

Special caulking compounds are used to seal all joints in the plywood sheathing.

Lumber and plywood that comes in contact with the ground should be pressure-treated with waterborne preservative salts (ACA or CCA).

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Wood Foundation-BasementWood Foundation-Basement

After the basement wall is in place, the porous gravel or crushed stone base is covered with a polyethylene film (6 mil thick).

The floor joists or trusses are then installed on the double top plate of the foundation wall.

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Wood Foundation-BasementWood Foundation-Basement

Before backfilling, a 6 mil polyethylene film should be applied to sections of the wall below grade to serve as a moisture barrier.

All joints should be lapped at least 6 in. and sealed with adhesive.

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Wood Foundation-BasementWood Foundation-Basement

The top edge of the film should be bonded to the wall at grade level with adhesive.

A treated wood strip is attached along this edge and caulked. It serves as a guide for backfilling.

Backfilling should not begin until the basement floor has cured and the first floor is installed.

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Concrete/Masonry Basement WallsConcrete/Masonry Basement Walls

Several factors influence the strength and stability of a concrete or masonry basement wall to resist earth pressure. height and thickness the bond of the mortar vertical loading support from crosswalls pilasters or wall stiffeners support provided by the first-floor framing

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Concrete/Masonry Basement WallsConcrete/Masonry Basement Walls

Pilasters, can be used to strengthen the basement wall.

Pilasters are built at the same time the basement wall is laid.

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Concrete/Masonry Basement WallsConcrete/Masonry Basement Walls

Pilaster block are frequently used for such construction

Pilaster blocks are 16 in wide 8” basement wall project 8 in. inside. 10” basement walls project 6 in. inside. 12” basement walls - not required.

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Concrete/Masonry Basement WallsConcrete/Masonry Basement Walls

Pilasters are also used for additional support for girders or beams.

Pilasters may also be required to stiffen concrete foundation walls.

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