USG SHEETROCK Ceiling Spray Textures User Manual

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Surface Substrate surfaces to receive finish must be sound, dry,clean, and free of oil, grease,and efflorescence. Preparation Discolored texture can result from application over surfaces that are unprimed, not thoroughly dry,or otherwise

improperly prepared. Prepare surfaces, maintaining min.55 °F (13 °C) air,product, and surface temperatures when applying joint compound and prime coat, as follows:

Glossy surfaces Lightly sand to dull any sheen and develop “tooth.”Wash surface with a strong detergent from

the bottom up to remove any dust, dirt, or sheen.A strong solution of TSP (trisodiumphosphate) works best; follow manufacturer’s directions on container. Prime bare metal with a good rust-inhibitive primer and let dry.

New concrete Age at least 60 days before texturing. Fill cracks and holes and level concrete surfaces with

HEETROCK

Brand DURABOND®Setting-Type or EASY SAND™Lightweight Setting-Type Joint Compounds or COVER

COAT®Brand Compound and let dry.

New drywall Treat joints and fasteners with an appropriate USG Joint Treatment System.

Note: Texturing over previously painted, textured, or stained substrate requires prior application of a stain-blocking

sealer to obtain uniform color.

Priming After prepared surfaces have dried thoroughly, apply a prime coat of undiluted S

HEETROCK

BRAND

First Coat,

Substrate

and let dry. (Or use a good quality white interior flat wall paint with high solids content.) The application of a prime coat is intended to equalize surface porosity and provide uniform color,not to reduce sag potential. For plaster surfaces apply a primer-sealer recommended by paint manufacturers for priming lime gauging and lime-containing plaster finishes.

Maintenance/ Mixing Equipment Large tanks for mixing S

HEETROCK

Ceiling Spray Texture

Clean out periodically to prevent premature spoilage.

Adjustments

Self-contained horizontal mixing shaft spray units Periodically inspect and adjust rubber wipedown blades;

set mixer wall-to-paddle blade clearance for “small aggregate” (greater clearance leaves texture material partially undispersed).

Pumping Equipment General Inspect and maintain according to manufacturer’s recommendations.

Material hoses Check all material hose lengths and connections. Minimize total hose length and number of line

splices; eliminate line splices, if possible. (Pumping problems increase with hose length; connections and line splices are vulnerable to poly packing up and restricting material flow.)

Air hoses Check lines for air leaks; they reduce atomizing air pressure, and may cause problems.

Mixing During mixing, maintain air, water, and mix at min. 55 °F (13 °C). Use a clean mixing vessel, free of rust and

soured material. Fill mixing vessel with correct volume of water and power mix while slowly adding S

HEETROCK

Brand Ceiling Spray Texture powder.Mix initially to heavier consistency than desired for spraying. Then check mixer paddles/shaft and corners of mixing vessel for unmixed material. Remove with light water spray. Remix until powder is completely wet, creamy and lump free, and allow mixture to soak for at least 15 minutes—longer with cold water. Thin mixture to spraying consistency by adding small amounts of water until final water/powder ratio is as directed on bag. (Avoid excessive water, which can cause board sag, check-cracking,poor texture bond and lack of hide.)

SHEETROCK

Brand

Ceiling Spray Textures

Application Tips

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SAFETY FIRST!

Follow good safety practices. Read material safety data sheets and related literature on products before specification and/or installation.

Application During and after application, and at all times until building is occupied, maintain min.air,water,mix, and surface

temperatures of 55 °F (13 °C), and provide adequate ventilation for texture to dry properly. Inadequate ventilation can cause objectionable board deflection and reduced texture bond/surface hardness. Do not use unvented gas or oil heaters.

Correct equipment settings and mix consistency will maximize coverage (in ft.

/lb.), yet reduce aggregate fallout (bounce-back) and holidays (board voids). A steady, high-pitched sound should be heard from the pole gun during spray application. Slight adjustments for type and grade of aggregate in the texture may be necessary. Adjust air spike, orifice, and air pressure to optimize atomization and width of spray fan.As the pole gun orifice wears, it will slowly increase in size—periodically check and adjust it as necessary.

Spray texture mix on dry surface at a maximum rate of 8-10 ft.

/lb. For heavily textured appearance, apply two coats of texture, letting the first coat dry thoroughly before applying the next. (Do not vary coverage rate: check-cracking can result from excessive coating thickness, and poor hide from too thin a coating.)

Trademarks

The following trademarks used herein are owned by United States Gypsum or a related company: C

OVER COAT,DURABOND,

ASY SAND,SHEETROCK

Note

Products described here may not be available in all geographic markets. Consult your U.S. Gypsum Company sales office or representative for information.

Notice

We shall not be liable for incidental or consequential damages, directly or indirectly sustained, nor for any loss caused by application of these goods not in accordance with current printed instructions or for other than their intended use. Our liability is expressly limited to replacement of defective goods. Any claim shall be deemed waived unless made in writing to us within thirty (30) days from the date it was or reasonably should have been discovered.

Manufactured by United States Gypsum Company 125 South Franklin Street Chicago, IL 60606

800 USG.4YOU (874-4968) www.usg.com

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