LT #2 - Alternative Foundation Systems

Question 1

When constructing footings for PWF foundations, why are footing forms left un-cut whenever possible?

Answer 1

To avoid having to apply on-site treatment to pressure treated wood

Question 2

What are two stages for sealing and damp proofing a PWF wall?

Answer 2

1) Panel joints are caulked
2) Moisture barrier is placed below grade

Question 3

What type of fasteners must be used in treated lumber below grade in PWF construction?

Answer 3

Stainless steel

Question 4

How are wood footings made for columns in PWF construction?

Answer 4

2 layers of PWF lumber at 90 degrees to each other, resting on undisturbed soil. Steel plate is placed between the column and footing.

Question 5

What is the minimum depth of granular fill over the top of the entire excavation in PWF construction?

Answer 5

125 MM

Question 6

What is the difference between modular size and actual size of a concrete masonry unit?

Answer 6

3/8 larger for modular size - accounting for the vertical and horizontal mortar joints

Question 7

What type of C.M.U is used above a window a window or door-opening?

Answer 7

Beam / Lintel block

Question 8

What thickness of parging should be used to help protect Masonry Foundation Walls from moisture damage?

Answer 8

1/4 “

Question 9

How do insulated concrete forming systems differ from most other forming systems?

Answer 9

No rainscreen airing under the siding

Question 10

List the typical components of ICF systems

Answer 10

Panel and tie

Question 11

Where should rebar be placed in ICF?

Answer 11

Inside 1/2, 30 mm minimum concrete coverage

Question 12

Name three ways that ICF foundations can be laterally supported at the bottom of a wall?

Answer 12

1. Dowels
2. Keyway
3. Backfill less than 1.2

Question 13

Name three ways that ICF can be laterally supported at the top of the wall?

Answer 13

1. Walls anchored to the sill that support floor
2. Joists supported at sides of wall via ledger
3. Hanger joists embedded in concrete

Question 14

Name four conditions that the above-ground ICF wall must meet to fall under Part 9 of Code:

Answer 14

< 3 m high floor to underside of floor, 2 storeys max, SFO, seismic less than 0.4

Question 15

Granular material used in drainage should be:

Answer 15

Not more than 10% fine material that will pass a 4 mm sieve,

No material larger than 40 mm

Question 16

Sump should be:

Answer 16

At least 750 mm below the top of gravel bed,

drained by gravity with a 100 mm pipe

Question 17

A layer of clean granular fill should be how deep around excavation?

Answer 17

125 mm deep

Question 18

Footing can be placed on undisturbed soil but must:

Answer 18

lay directly on the soil 60 mm drainage tile must be spaced at 1200 mm on center around perimeter in any interior footings

Question 19

CMU block is typically sized:

Answer 19

7 5/8 high by 15 5/8 to allow for a 3/8 mortar join between adjacent blocks.

Question 20

Foundation corners are set first or last?

Answer 20

First, the mason will work from corner to center of wall

Question 21

Top of block wall is often capped off with:

Answer 21

Solid top block or row of beam blocks in which steel and concrete are placed to form “bond beam”

Question 22

What can be incorporated into block walls to counteract point loads and strengthen walls?

Answer 22

Pilasters

Question 23

Mason wall protected by:

Answer 23

Parging compound at least 1/4”

Question 24

Mortar is a mix of:

Answer 24

Portland cement, hydrated lime, sand, and water.

Question 25

Verticall mortar joints between adjacent blocks are called:

Answer 25

Head joints

Question 26

Horizontal mortar joints between layers of blocks are called:

Answer 26

bed joints

Question 27

What is the common bond for CMU?

Answer 27

Blocks are overlapped by 1/2 to 1/3 a block length.

Question 28

Stacked bond pattern:

Answer 28

Every second bed joint is reinforced with steel rods or corrugated metal strapping

Question 29

What is core fill?

Answer 29

Mixture of sand and aggregate

Question 30

Aggregate in core fill is what diameter?

Answer 30

Typically smaller - 3/8 “ to 1/2 “

Question 31

ICF panel hardware consists of:

Answer 31

Panels, ties, corner, anchor brackets and metal tracks

Question 32

ICF Polystyrene usually is how thick:

Answer 32

2.25 to 4.25 “

Question 33

What is a flatwall?

Answer 33

Wall that has a uniform concrete thickness over the height and width of the wall

Question 34

What is a masswall?

Answer 34

Can be used to construct walls above the foundation level Listed in Code: