edt 51-floor plan design1 weekend cabin retreat project basements sacramento city college edt 51...
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EDT 51-Floor Plan Design 1
Weekend Cabin Retreat ProjectWeekend Cabin Retreat ProjectBasementsBasements
Sacramento City CollegeEDT 51
Kenneth Fitzpatrick, P.E.
2 EDT 51-Floor Plan Design
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.
3 EDT 51-Floor Plan Design
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
4 EDT 51-Floor Plan Design
Wood Foundation-BasementWood Foundation-Basement
The foundation walls (2 x 4 or 2 x 6 stud frame) are erected on these plates.
7 EDT 51-Floor Plan Design
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).
8 EDT 51-Floor Plan Design
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.
9 EDT 51-Floor Plan Design
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.
10 EDT 51-Floor Plan Design
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.
12 EDT 51-Floor Plan Design
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
13 EDT 51-Floor Plan Design
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.
14 EDT 51-Floor Plan Design
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.
15 EDT 51-Floor Plan Design
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.