Chapter 11: Interior Construction Flashcards
What are the sizes for gypsum wallboard?
4’ wide; lengths of 8’, 10’, 12’, 14’
What is the thickness of gypsum wallboard?
Thicknesses range from 1/4” to 5/8” - 5/8” thick is typically used in commercial; 1/2” is commonly used in residential
Special 1” thick core board used for shaft enclosures is manufactured in 2’ widths.
There is also a special 3/4” thick product that carries a 2 hour fire rating.
1/4” is used for curved surfaces
How is gypsum wallboard applied?
Applied by nailing or screwing it to wood or metal framing, or with mastic when applying it to smooth, dry concrete or masonry walls.
The joints are finished by embedding paper or fiberglass tape in a special joint compound and allowing it to dry.
Additional layers of joint compound are added and sanded after each application to give a smooth, finished wall surface.
What are the Recommended levels of Gypsum board finish?
- Level 0: Requires no taping, finishing, or accessories
- Level 1: Joints have tape embedded in join compound with the surface free of excess joint compound. Used for plenums above ceilings and areas not open to view
- Level 2: Tape embedded in joint compound and one separate coat of compound applied over joints; used where water-resistant backing board is employed as a substrate for tile.
- Level 3: Similar to Level 2, except 2 coats of joint compound are used; used where surface will receive heavy or medium-textured finishes
- Level 4: Similar to Level 3 except 3 coats of joint compound are used; used where light textures or wallcoverings will be applied; paint not recommended
Level 5: Thin skim of joint compound is applied over the entire surface. Used where paints are specified.
What are standard stud depths?
Wood: 2x4 and 2x6
Steel: 1 5/8”, 2 1/2” (most common), 3 5/8”, 4, 6”
What determines the depth of the stud?
Depends on the height of the partition, the gauge of the stud, the numbers of layers of wallboard, and the spacing of the studs.
What is the spacing of studs?
16” or 24”
What are the different types of gypsum wallboard trim?
- LC bead: Edge trim requiring finishing with joint compound. It has a back flange, so it must be fitted over the edge of the wallboard before the wallboard is fastened to the substrate.
- L bead: Edge trim without a back flange; good for installation after the wallboard has been installed. It requires finishing with joint compound
- U bead: Edge trim in which the edge of the metal is noticeable. It is sometimes called J metal by contractors. It does not require finishing with joint compound.
- LK bead: Edge trim for use with various thicknesses of wallboard in a kerfed jamb (one with a small slot cut in). It requires finishing with joint compound.
What is glass-reinforced gypsum and what is it used for?
Refers to the broad class of products manufactured from high-strength, high-density gypsum reinforced with continuous-filament glass fibers or chopped glass fibers. Used for decorative elements. They’re pre-manufactured products made by pouring GRG into molds.
What is plaster made from?
Gypsum, lime, water, and aggregates of sand, vermiculite, or perlite.
What are the two methods of plaster construction?
-Traditional - metal lath is attached to wood or metal studs and serves as the base for the plaster.
- The other method uses gypsum board lath instead of metal lath. Gyp boards are applied to studs and one or two coats of thin veneer plaster are applied over the boards
The edges of plaster must be finished with trim.
What is a demountable partition?
Consists of a system of individual components that can be quickly assembled, disassembled, and reused with nearly total salvageability. They are intended to remain in place. Allow space to be reconfigured quickly and easily as needs change.
What are the components of a demountable partition?
- Floor runners
- Ceiling runners
- Stud sections with clips to hold the panels
- Prefinished gypsum wallboard panels
What’s the difference between a progressive and non-progressive partition system?
In a progressive system, the first panel must be placed before the second panel and so on. In a nonprogressive system, the panels are independent and can be removed or replaced individually.
What’s the hinge jamb?
Side of the door with the pivot
What’s the strike jamb?
Side of the door where the door closes.
How is a hollow-core door constructed?
Made of one or three plies of veneer on each side of a cellular interior. The frame is made with solid wood with larger blocks of solid wood where the latching hardware is located.
