020302d Flashcards
What is the maximum vertical rise between stair landings?
3.7 m
Why are “loop inserts” attached to the keys formed in stairwell walls?
To allow threaded rods to tie into the throat of the stairs.
What is involved in accurately determining the length of the soffit formwork for a concrete stair landing?
Allow for nosing, landing thickness and the soffit throat measurements.
What is the most critical item when forming a concrete stair?
The location and attachment of the rider forms.
If a stairway is to have a mid-height landing, how many risers are required?
An even number of risers
What is the suggested unit ride for an interior stair?
180 mm
If multiple stairs with the same rise, run configuration are to be constructed, what is recommended as an economical solution for holding the riser forms in place?
An inverted stringer with short pieces of angle iron.
If concrete stairs have been laid out properly but there is a consistent collection of water along the treads, what has caused this to happen?
Riser material was cut wider than the unit rise.
You would use solid lumber at the top of the plywood concrete stair soffit forms to avoid cutting plywood forms. T or F
T
What is the result if riser forms used on a concrete stair are ripped 6 mm too wide?
The treads will slope inwards and trap water.
Why are inverted stringers placed 30 mm above the finished tread level?
To allow easier concrete finishing.
