LT #2 - Alternative Foundation Systems Flashcards
When constructing footings for PWF foundations, why are footing forms left un-cut whenever possible?
To avoid having to apply on-site treatment to pressure treated wood
What are two stages for sealing and damp proofing a PWF wall?
1) Panel joints are caulked
2) Moisture barrier is placed below grade
What type of fasteners must be used in treated lumber below grade in PWF construction?
Stainless steel
How are wood footings made for columns in PWF construction?
2 layers of PWF lumber at 90 degrees to each other, resting on undisturbed soil. Steel plate is placed between the column and footing.
What is the minimum depth of granular fill over the top of the entire excavation in PWF construction?
125 MM
What is the difference between modular size and actual size of a concrete masonry unit?
3/8 larger for modular size - accounting for the vertical and horizontal mortar joints
What type of C.M.U is used above a window a window or door-opening?
Beam / Lintel block
What thickness of parging should be used to help protect Masonry Foundation Walls from moisture damage?
1/4 “
How do insulated concrete forming systems differ from most other forming systems?
No rainscreen airing under the siding
List the typical components of ICF systems
Panel and tie
Where should rebar be placed in ICF?
Inside 1/2, 30 mm minimum concrete coverage
Name three ways that ICF foundations can be laterally supported at the bottom of a wall?
- Dowels
- Keyway
- Backfill less than 1.2
Name three ways that ICF can be laterally supported at the top of the wall?
- Walls anchored to the sill that support floor
- Joists supported at sides of wall via ledger
- Hanger joists embedded in concrete
Name four conditions that the above-ground ICF wall must meet to fall under Part 9 of Code:
< 3 m high floor to underside of floor, 2 storeys max, SFO, seismic less than 0.4
Granular material used in drainage should be:
Not more than 10% fine material that will pass a 4 mm sieve,
No material larger than 40 mm
Sump should be:
At least 750 mm below the top of gravel bed,
drained by gravity with a 100 mm pipe
A layer of clean granular fill should be how deep around excavation?
125 mm deep
Footing can be placed on undisturbed soil but must:
lay directly on the soil 60 mm drainage tile must be spaced at 1200 mm on center around perimeter in any interior footings
CMU block is typically sized:
7 5/8 high by 15 5/8 to allow for a 3/8 mortar join between adjacent blocks.
Foundation corners are set first or last?
First, the mason will work from corner to center of wall
Top of block wall is often capped off with:
Solid top block or row of beam blocks in which steel and concrete are placed to form “bond beam”
What can be incorporated into block walls to counteract point loads and strengthen walls?
Pilasters
Mason wall protected by:
Parging compound at least 1/4”
Mortar is a mix of:
Portland cement, hydrated lime, sand, and water.
Verticall mortar joints between adjacent blocks are called:
Head joints
Horizontal mortar joints between layers of blocks are called:
bed joints
What is the common bond for CMU?
Blocks are overlapped by 1/2 to 1/3 a block length.
Stacked bond pattern:
Every second bed joint is reinforced with steel rods or corrugated metal strapping
What is core fill?
Mixture of sand and aggregate
Aggregate in core fill is what diameter?
Typically smaller - 3/8 “ to 1/2 “
ICF panel hardware consists of:
Panels, ties, corner, anchor brackets and metal tracks
ICF Polystyrene usually is how thick:
2.25 to 4.25 “
What is a flatwall?
Wall that has a uniform concrete thickness over the height and width of the wall
What is a masswall?
Can be used to construct walls above the foundation level Listed in Code:
