Dywall Application and Finish (Chap. 67-69)
What is a sureform?
Basically a drywall rasp used to smooth the ragged edges of drywall.
Proper spacing of screws for horizontal drywall?
5 Screws: "In the field" along each stud 7 Screws: Along the butt seams
What tool can be used for all compound coatings for inside corners?
A 4" joint knife
What tool is used to make square cuts across drywall?
A T-square
What tool is helpful in raising drywall sheets off the floor for wall installation?
A drywall foot lifter
What tool is helpful in depressing & countersinking screws to a uniform depth?
A drywall screwgun
What drywall accessories are available that isn't metal?
Rigid Vinyl
Proper way to cut drywall
Score lightly with utility knife; snap the piece; score the back paper sides to separate the pieces.
How much should a tapered joint feather out?
Should feather out about 10" wide
Typical depth of a drywall screw in support material?
Should go at least 5/8" into the support material
What is drywall adhesive?
Used to bond single layers of drywall directly to studs or ceiling joists; Must ALWAYS be applied to ceiling drywall sheets
What is Spotting?
Using joint compound to conceal fastener heads
Common width and lengths of drywall
Width: 4' Length: 8', 9', 10', 12', 14', 16'
How much should butt joints finish out by?
Between 18"-24"
What is the process for installing drywall onto ceilings?
Double-nailing (or double-screwing)
Another term for Drywall "Mud"?
Drywall compound
What tool can be used to make fast, easy, and exact holes in drywall?
Drywall cutout tool (Must NOT come in contact with electrical wiring)
What are Slicks?
Drywall nails with a flat concave head that tapers to thin edges at the rims. Should be installed with a drywall hammer
One Main goal when installing drywall?
Eliminate as many butt joints as possible, especially in the ceiling.
How much allowance should ceiling drywall have when being hung?
From wall to wall, there should be a 1/4" gap at each end
Material used to help finish walls in residential and commercial construction
Gypsum Board (Aka. Drywall, Sheetrock, Plasterboard)
What tool can be used to manually cut out drywall?
A wallboard/drywall saw.
Common thicknesses of Drywall
Residential: 1/2" thick Commercial: 5/8" thick
The rule when it comes to tapered and butt joint coverings
Always feather out another 2" beyond the previous coat
What is the ideal temperature for drywall finishing?
Anything over 50 degrees.
The 3 necessary coats of drywall compound
1. The tape coat; pressing joint tape into joint compound 2. Second coat is called the fill coat 3. Called the prefill coat, prefills any coats between panels over 1/4"
What panel product has a Portland cement core, reinforced with glass fiber mesh on both sides?
Cement board (Wonder Board). Can resist water in high moisture conditions
What is used to help protect the exterior corners of drywall from damage or impact?
Corner beads.
Green Lid on 5 gal. drywall compound bucket
Is a heavy or regular weight and is used for the first coat of compound on drywall
What is Type X gypsum board?
It is known as 'fire-code board' because it has a great fire resistance
Blue Lid on 5 gal. drywall compound bucket
Light weight and used for 3rd coat of compound on drywall
What type of gypsum board should be installed in rooms with high humidity (Like a bathroom)?
MR (Moisture resistant) board or Green Board
What is a good rule when hanging drywall horizontally?
Make sure to use sheets that are of a sufficient length so that one can avoid butt joints
Purple/Gold Lid on 5 gal. drywall compound bucket
Mid-weight and used for 2nd coat of compound on drywall
Drywall being installed in walls should be hung tight to what?
The ceiling
What are tapered joints?
The longer edges of drywall that allows for a flat and effective joint concealment
Where is the top sheet hung when installing drywall horizontally?
The top sheet is installed tight into the ceiling first, followed by the bottom sheet which is hung tight to the top sheet.
What are 'Deadmen' in construction?
They are supports in the hanging of drywall ceiling sheets that form a "T"
Where can butt joints in drywall not fall? Why is that?
They cannot fall within 3" of the corners of openings; so as to prevent future settling cracks
How far into drywall should fasteners go?
They should be set in only slightly (AKA dimpled). This is for easy concealment.
Where should cut edges of drywall be placed?
Towards any and all corners
Fasteners needed to install for drywall applied to light-gauge metals
Type S screws (As well as S12)
Fasteners needed to install drywall to wood framing
Type W screws
What are butt joints?
Untapered edges of gypsum board that require a crowned buildup of joint compound
