Combining the workability you need for application with the durability you want for long-term performance, Certainteed Midweight Joint Compound is ideal for use in all phases of gypsum-board finishing: taping, finishing, skim coating, texturing, filling corner beads and trim, and concealing nail or screw dimples.
Ideal for all levels of finish (tape, bead, finish, texture), Certainteed Midweight is premixed, ready to use right out of the container, and dries quickly with minimal shrinkage. It offers excellent workability with a smooth and durable surface finish that resists abrasion.
Available in 4.5 gallon pail, or 3.5 and 4.5 gallon boxes.
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Material: Vinyl-type formulation.
Emissions: Asbestos free.
Coverage: Approximately 8.3 gallons (31.4 liters) per 1,000 square feet (100 square meters); coverage will depend on number of beads and amount of trim.
Drying time: Thoroughly dry in approximately 24 hours. Drying times will vary with temperature and humidity (see GA-236).
Storage: Up to nine-month shelf life if protected from extreme heat and cold.
Certainteed Midweight is manufactured to conform to ASTM C475.
Apply according to Gypsum Association publications GA-214 and GA-216.
Taping and Finishing Joints:
Step one: Using a taping knife (4–6 in.), generously apply joint compound to the surface you want to finish (tapered edge). Then press joint tape firmly into the compound, removing any excess material behind the tape and creating a good bond with the gypsum board. Allow compound to dry thoroughly.
Step two: Using a finishing knife, trowel or mechanical tool (8-10 in.), apply a fill coat of joint compound over embedded tape. Remove excess material by feathering the center and the edges of the joint. Allow compound to dry thoroughly.
Step three: Using a finishing knife, trowel or mechanical tool (10–12 in.), apply a thin coat of joint compound over Step Two at a width adequate to fill any voids or shallow spots. Remove excess material by feathering the center and the edges of the joint. Allow compound to dry completely before sanding or painting.
Finishing Inside Corners:
Using a steel finishing knife (4”– 6”), generously apply Certainteed Midweight to both sides of the inside corner. Fold joint tape along center crease and press firmly into center of the inside corner. Remove any excess material behind the tape and create a good bond with the gypsum board. Allow compound to dry thoroughly. Apply second coat to one side, allow to dry and apply to opposite side.
Allow compound to dry thoroughly before sanding or painting.
Fastener Heads and Trim:
Certainteed Midweight can be applied to fill corner beads and conceal fasteners (nail/screw dimples). A second coat should be applied when dry. Apply a third coat over the fasteners if needed.
Certainteed Midweight washes off easily with warm water. Tools should be dried thoroughly to prevent rusting.
Sanding is not required between applications unless the work is rough. Sand lightly after Step three application is completely dry. If drysanding, use minimum 150-grit sandpaper. Avoid over-sanding, which can scuff gypsum board paper.
Certainteed Midweight can be used to skim coat gypsum board walls. A skim coat leaves a thin film of joint compound over the entire gypsum board surface, fills imperfections and eliminates texture differences between the gypsum board and the joint compound. Skim coating is recommended for rooms with critical lighting conditions.
Painting and Wallpapering:
Painting should not proceed until joint compound is thoroughly dry (See GA-236). For best results, a good quality gypsum board primer should be applied, in accordance with manufacturer’s instructions, before painting or wallpapering.
Certainteed Midweight can also be used to texture walls and ceilings. For best results, apply a high-quality gypsum board primer before texturing, making sure to follow the manufacturer’s instructions. Joint compound can be applied (up to 1/4 in. thick) with a roller, sponge, brush or trowel to create the desired effect. Paint over when dry.
Since methods and conditions of application and storage, such as temperature, humidity and over thinning are beyond our control, CertainTeed Gypsum, Inc. (CertainTeed) will not be responsible for the failure of this product when not used and stored according to directions and specifications and accepted standards of procedure inherent in drywall application; or when reasonable allowance is not made by the user for adverse weather and job conditions. However, if this product proves to be defective, CertainTeed’s maximum liability shall be limited to replacement of the defective material only or refund of the original purchase price. CertainTeed will not be responsible for any other costs or expenses. These shall be the exclusive warranty and remedies provided by CertainTeed, including without limitation, the implied warranties or merchantability, fitness for use and fitness for a particular purpose. All claims shall be submitted in writing to CertainTeed within thirty days from the date of discovery. State or federal laws may provide rights in addition to this limited warranty that cannot be modified or excluded.
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