I5 - Installation of Gypsum Wallboard Flashcards
What is the screw spacing for drywall in top and bottom plates in a braced wall panel?
300 MM OC
Spacing for drywall for top & bottom plates in brace wall panel for nails?
200 MM OC
How much penetration into wood stud is required by BCBC for a screw that secures drywall if there isn’t a required fire rating?
15 mm
How long does taping and filling process normally take?
At least 2 weeks.
What is the min. temperature that the building interior must be heated to during taping and filling?
The minimum temp. is 10 degrees
Why are wall-ceiling corners fastened in a manner that allows the ceiling drywall to float?
Prevents cracking from truss uplift and lumber shrinkage.
What is the minimum distance required by BCBC between the fastener and the edge of the drywall sheet?
10 MM (3/8)
How is drywall attached to steel framing?
Bugle head fine thread screws and adhesive.
What is done to reduce pop-outs?
Wallboard must be in full contact with the support during & after fastening. Fasteners must not be too long.
How is drywall filler applied to inside corners?
Using a corner trowels.
How is drywall filler applied to paper tape?
Passing tape through a hopper of filling compound.
How wide is a finished butt joint?
At least 20 “ for finished butt join
Drywall board must be installed how?
Drywall installed:
- Minimum joints
- Fully fastened to the supports
- Installed without surface defects.
What type of heater is used to keep buildings warm in winter months?
Large construction type electric or propane heaters are best used.
If there is a slight gap between the back of the wallboard and the support, what will happen?
Fastener will pop out when the board is pushed tight to the support, creating a bulge in the surface of the drywall.
How can you eliminate gaps behind drywall boards when installing over unlevel surfaces?
Unlevel surfaces:
Supports may need to be shimmed
Or
Warped studs may have to be cut and straightened.
Drywall ceiling boards should be:
Drywall ceiling boards should be: Minimum of 12” from walls,
Wallboards are meant to support the ceiling drywall, to prevent lumber shrinkage or truss-uplift from causing the joints to open.
Joints in drywall board are:
Joints in drywall boards are: Taped and filled or covered with a batten or bead.
When measuring drywall, what is the best amount of drywall tape to take off?
3mm off measurement for a safety net
How big of a gap may be left when fitting to door and window openings because the interior casings will cover the gap?
1/2”
Fitting electrical outlet boxes, the gap cannot be more than:
3mm because the light fixture or cover plate will only cover the joint by 6mm
Outlet boxes can be cut out with:
Drywall keyhole saw or knife., also cut out with a drywall router after board is in place.
Gypsum is corrosive therefore only use what to cut it?
Drywall router.
Drywall knife blades need to be replaced:
Every 2 hours or less if working quickly.
What is drywall install sequence?
1) Ceiling
2) Board on wall is installed horizontally
How is drywall fastened to steel framing?
With screws and adhesive. Bugle head fine-thread screw is used to fasten to light gauge steel.
Drywall is finished by applying at least how many coats?
Drywall is finished by at least three coats of joint filler to the taped seams and corner beads.
How many coats are normal for filling over nails or screws?
Two coats
External corners are susceptible to damage:
The bead can be nailed or crimped onto the drywall or it can be glued with drywall filler.
