I5 - Installation of Gypsum Wallboard

Question 1

What is the screw spacing for drywall in top and bottom plates in a braced wall panel?

Answer 1

300 MM OC

Question 2

Spacing for drywall for top & bottom plates in brace wall panel for nails?

Answer 2

200 MM OC

Question 3

How much penetration into wood stud is required by BCBC for a screw that secures drywall if there isn’t a required fire rating?

Answer 3

15 mm

Question 4

How long does taping and filling process normally take?

Answer 4

At least 2 weeks.

Question 5

What is the min. temperature that the building interior must be heated to during taping and filling?

Answer 5

The minimum temp. is 10 degrees

Question 6

Why are wall-ceiling corners fastened in a manner that allows the ceiling drywall to float?

Answer 6

Prevents cracking from truss uplift and lumber shrinkage.

Question 7

What is the minimum distance required by BCBC between the fastener and the edge of the drywall sheet?

Answer 7

10 MM (3/8)

Question 8

How is drywall attached to steel framing?

Answer 8

Bugle head fine thread screws and adhesive.

Question 9

What is done to reduce pop-outs?

Answer 9

Wallboard must be in full contact with the support during & after fastening. Fasteners must not be too long.

Question 10

How is drywall filler applied to inside corners?

Answer 10

Using a corner trowels.

Question 11

How is drywall filler applied to paper tape?

Answer 11

Passing tape through a hopper of filling compound.

Question 12

How wide is a finished butt joint?

Answer 12

At least 20 “ for finished butt join

Question 13

Drywall board must be installed how?

Answer 13

Drywall installed:
- Minimum joints
- Fully fastened to the supports
- Installed without surface defects.

Question 14

What type of heater is used to keep buildings warm in winter months?

Answer 14

Large construction type electric or propane heaters are best used.

Question 15

If there is a slight gap between the back of the wallboard and the support, what will happen?

Answer 15

Fastener will pop out when the board is pushed tight to the support, creating a bulge in the surface of the drywall.

Question 16

How can you eliminate gaps behind drywall boards when installing over unlevel surfaces?

Answer 16

Unlevel surfaces:

Supports may need to be shimmed

Or

Warped studs may have to be cut and straightened.

Question 17

Drywall ceiling boards should be:

Answer 17

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.

Question 18

Joints in drywall board are:

Answer 18

Joints in drywall boards are: Taped and filled or covered with a batten or bead.

Question 19

When measuring drywall, what is the best amount of drywall tape to take off?

Answer 19

3mm off measurement for a safety net

Question 20

How big of a gap may be left when fitting to door and window openings because the interior casings will cover the gap?

Answer 20

1/2”

Question 21

Fitting electrical outlet boxes, the gap cannot be more than:

Answer 21

3mm because the light fixture or cover plate will only cover the joint by 6mm

Question 22

Outlet boxes can be cut out with:

Answer 22

Drywall keyhole saw or knife., also cut out with a drywall router after board is in place.

Question 23

Gypsum is corrosive therefore only use what to cut it?

Answer 23

Drywall router.

Question 24

Drywall knife blades need to be replaced:

Answer 24

Every 2 hours or less if working quickly.

Question 25

What is drywall install sequence?

Answer 25

1) Ceiling
2) Board on wall is installed horizontally

Question 26

How is drywall fastened to steel framing?

Answer 26

With screws and adhesive. Bugle head fine-thread screw is used to fasten to light gauge steel.

Question 27

Drywall is finished by applying at least how many coats?

Answer 27

Drywall is finished by at least three coats of joint filler to the taped seams and corner beads.

Question 28

How many coats are normal for filling over nails or screws?

Answer 28

Two coats

Question 29

External corners are susceptible to damage:

Answer 29

The bead can be nailed or crimped onto the drywall or it can be glued with drywall filler.