WHITE GYPSUM MANTELS Installation Instructions
White Gypsum Mantel material meets the requirement for non-combustibility when tested in accordance to ASTM E-136.
You will need the following tools and materials to build your mantel:
The components for a typical installation may include: White Gypsum Mantel surround components (legs and shelf), non-combustible facing panels (header and legs) and a hearth. Certain mantel styles include a shelf mounting bracket that has cleats to be fastened to the wall with screws to help support the mantel shelf. Installation Instructions are sent with each Mantel.
Handle products with care to avoid damage to ornamental surfaces and fracturing of components. Avoid unnecessary contact of exposed faces of components with objects that may scratch or scuff surfaces. Carry components on edge and store in original packaging at room temperature.
Mantel components are ideally applied to solid, stable, flat and level substrates such as plaster or drywall. Wood surfaces are typically not stable and may cause cracks in components or filled joints.
Layout and dry fitting of entire mantel is recommended before any adhesive is applied.
Components may be secured using a high-strength construction adhesive that is suitable for plaster or masonry material and potentially high temperature application.
Use bracing to secure components tight to the wall until the adhesive sets. Avoid adhesive on exposed component surfaces. Use a finishing nail or a small piece of plastic (shaped like a 'V') to remove excess adhesive at joints. Clean off excess adhesive immediately as required by adhesive manufacturer instructions.
Hearth and Facing Panels Installation
- Install the hearth first, centered on the firebox opening and set tight to the wall.
- Install facing panels.
Some models in the White Gypsum mantel collection may either include a rabbit cut to allow for facing panels or have the option for one along the firebox side of the mantel components. This recessed area may be used to:
a) Accept marble, stone, tile, or other filler (facing panel) material; or
b) Be filled-in with a non-shrinking, non-combustible, sandable wallboard compound, if the recessed area is not required.
Use pencil lines to outline the inside edges of the mantel shelf and legs.
White Gypsum fireplace mantels in the Noble Collection require facing panels to be sized and cut to extend within the 3/4"-wide rabbet along the inside edges of the mantel components.
Layout and dry fit the filler panels before applying adhesive to ensure facing panels extend within the 3/4" x 1" rabbet along the firebox side of the White Gypsum Mantel.
- Install mantel legs. Note: The mantel legs can be cut at the base to adjust the overall height of the mantel. Install so that each mantel leg overlaps its respective facing panel. When set in place, the level height of each mantel leg must be identical to provide for a level mantel shelf. Use shims to level the mantel legs. Apply a generous and continuous bead of adhesive to ensure continuous contact between wall and bedding surface of the mantel legs. Brace mantel legs securely until the adhesive sets.
- Install mantel shelf. Note: Many of our larger mantel shelves are cast with a cavity in the back to accommodate wood blocking for support. Locate the wood blocking position by offsetting the material thickness at the top of the shelf from a pencil line indicating the top edge of the mantel shelf when set on the mantel legs. Screw wood blocking with wood screws into wall studs for greatest support. Other mantels come with a shelf mounting bracket that has cleats. If included, screw this cleat to the wall as instructed. Apply a generous amount of adhesive to the bedding surfaces of the mantel shelf and the top of the wood blocking to ensure continuous contact with the wall. Pile adhesive on top of the wood blocking and continuously along its length so that the mantel shelf will settle into the adhesive as it is lowered onto the mantel legs. Use bracing to secure the mantel shelf tight to the wall until the adhesive sets.
While it is usually not necessary, you can carefully pre-drill through gypsum mantel components and use screws for added security.
Note: Place the bracing against the mantels surface gently and make sure that the bracing is padded on the end touching the mantel surface.
Note: Avoid adhesive on exposed component surfaces. Use a finishing nail or a small piece of plastic (shaped like a 'V') to remove excess adhesive at joints. Clean off excess adhesive immediately as required by adhesive manufacturer instructions.
For additional security on larger mantel shelves, install two (2) - 3"-long wood screws into the top of the mantel shelf and into the wood blocking below. Locate screw holes approx 1" from the wall and 18" on either side of the mantel centerline. Drill pilot holes first and countersink so that screw heads are located below the surface of the mantel shelf. Fill screw holes with paintable latex caulk, or non-shrinking compound and tool to a smooth finish.
Fill joints between components and any gaps around the mantel with a paintable latex caulk and tool to a smooth finish.
White Gypsum mantels will accept lacquers, stains, oil-based or acrylic paints. Apply a drywall primer first, then apply finish in thin coats to avoid filling-up the design details. For best results, use flat or eggshell finishes.
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