What are the several types of foundations that may be used to support the live and dead loads of a residential building?
- crawlspace
- slab on grade
- basement
What is a foundation?
The foundation is a system or arrangement of foundation units through which the load from a building are transferred to the supporting soil.
What does the depth of the foundation depend on?
- The bearing capacity of the soil
- The depth of the frost penetration
- The foundation design being considered
- experiences with local soil condition shows a lesser Depth are satisfactory
List the five variables that can affect the stability of a foundation wall.
- The height of the finish grade from finished floor
- The thickness of the foundation
- The material used to construct the foundation
- whether or not lateral support exists
- The amount of lateral pressure extended on the wall, example is there a road next to the wall?
The national building code considers foundation walls to be laterally supported in the following situations
- When the floor joists are embedded into the foundation wall
- When the foundation wall supports solid masonry construction.
- When the floor system is anchored to the top of the foundation wall with not less than 12.7mm-diameter anchor bolts spaces not more than 2.4m apart.
Foundation walls are NOT considered laterally supported in the following situations.
1.when they support woodframe pony walls with the floor supported on top of the pony wall
2.when there are openings in the foundation wall for windows that exceed 1.2-m in length or make up more than 25% of the wall area
EXCEPTION: if the wall is suitably reinforced at the opening, it is considered to be laterally supported
3. When the length of the solid wall between windows is less than the average length of the openings, the combined length shall be considered as one opening,
Same exception as above
What are three ways to ensure foundation walls are considered laterally supported to the national building code standards
- embed the floor joist into the foundation wall.
- Ensure the foundation wall supports solid masonry construction
- anchor the floor system to top of the foundation wall with no less than 12.7-mm diameter anchor bolts spaced not more than 2.4m apart
List two variables that will affect the thickness of a specific foundation wall
- The vertical loads applied
2. The lateral loads applied
List for foundation systems
- basement wall systems
- perimeter wall system
- ground slob systems using poured concrete
- Pio and being system using concrete and or preserved wood.
