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Published byElisabeth Capstick Modified over 9 years ago
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Lather Skill Trades 1201
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Introduction Lathers Assemble and install the framework for gypsum materials (Drywall & Plaster) in buildings.
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Plasters Two main types: 1. Cement based - Used mainly for outdoors. 2. Gypsum based – Indoors only.
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Cement Based Can be used indoors for areas that Are likely to become damp and Require a greater thickness of cover.
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Gypsum Based Used in conjunction with drywall to cover the interior walls. Can be powder form which must be mixed with water, or Premixed and ready for use.
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Drywall Joint Compound Two categories: 1. Drying-type compounds 2. Setting-type compounds
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Drying Type Compound The most common compound Pre-mixed or Powdered form Dry via water evaporation Allow 24 hours for drying
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Drying Type Compound Three kinds of drying type compound: 1. Topping compound: Final thin coat, Ease of workability
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Drying Type Compound 2. Taping compound: First coat to capture the joint tape Second coat as filler
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Drying Type Compound 3. All-purpose compound: Any stage of drywall joint taping. It is the most commonly used
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Setting Type Compound Dries by chemical reaction Hardens much quicker (20 mins to 6 hrs). Harder to sand. Does not come premixed
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Drywall Sheet material made of a sandwich of gypsum and two layers of paper.
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Drywall sizes Width 4 feet Length 8, 10 or 12 feet Commercial builders often use sheets up to 16 feet in length.
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Drywall Thickness 5/8 inch panel: Considered fire resistant.
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Drywall Thickness 1/2 inch panel: Most commonly used General purpose for walls and ceilings.
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Drywall Thickness 1/4 - 3/8 inch panel Used sometimes to overlay existing, older walls in order to make it smoother. Is also used to make curved walls.
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Types of Drywall Standard drywall sheets Have tapered long edges and the short ends are squared off. One face is rough, and one face is smooth, for painting and papering.
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Types of Drywall Moisture Resistant Board Also known as Greenboard. Used in interior areas such as bathrooms and basements where added moisture resistance is needed.
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Types of Drywall Fire Rated 5/8 drywall. Used between apartments.
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Fasteners Screws Type W bugle head screws Has a course thread and provides excellent holding power in wood.
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Screws cont’d. Type S bugle head screws Has a tip that drills its own hole in metal studs in walls.
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Fasteners Nails Ringed-Shank nails The rings provide better grip. Provides 50 to 100 percent greater holding power than a smooth-shank nail.
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Drywall Tape Drywall tape is used to cover or seal the joins between drywall edges.
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Drywall Tape Types Flexible Paper The paper tape is applied into wet plaster. Crease in centre so it can be folded.
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Drywall Tape Fiberglass Mesh Fabric - The mesh is usually self adhesive.
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Drywall Tools
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6. Sanders: used to smooth the plaster before paint is applied.
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Installing Drywall Drywall is always fastened to the ceiling before the walls. Drywall is fastened to the “studs” of the walls.
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Ceiling
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Walls
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