F2 - Describe Backfilling - LT #7 Flashcards
The main advantage of early backfilling is that:
The main advantage of early backfilling is that:
Material is easier to stack on-site and access is better around the building.
Mechanical damage is damage caused by:
Physical impact from any source.
Before backfilling can start, what must be done?
1) Perimter drain system installed
2) Foundation Damp-proofing
3) Placement of underground services
What is the minimum time that concrete foundations should be cured before backfilling?
14 days minimum cure time for foundations.
What causes the interior of foundations to be wet?
1) Cracked foundation walls
2) Rusted-out form ties
3) Poorly draining backfill
A 10” or larger boulder resting against a foundation wall can cause the wall to crack because the rock causes:
Point load against the foundation wall
When backfilling against foundation walls, it is best to:
Start with the corners first(they’re generally stronger)
Slab-On-Grade need:
Uniformly Dense Base
Why is it good to let the backfill stay in place for a length of time before finishing the grade surface?
Backfill will settle naturally and then the surface can be final graded.
Backfilled areas are usually compacted wherever:
Concrete walks or driveways will be placed over them.
Typically what is installed on the foundation walls before backfilling begins?
Floor system for lateral support.
Form tie ends should be plugged or parged over with:
low slump concrete mix of three parts sand to one part cement.
Foundation walls using ICF require protection from:
Mechanical damage above grade and require damp-proofing membrane below grade.
Before drainage pipes are installed around the foundation, the foundation wall must be:
Damp-proofed with a thick layer of: Bitumen.
What is a drainage mat?
Material that will direct moisture or water toward the drainage pipe. A 3/4” thick drainage mat provides an open space for collecting moisture or water to collect.
