How to Slate Siding

Verify that flashing and waterproofing is properly installed around windows and other adjoining areas. Consult a professional and the building code for your area for specific requirements. Building suppliers provide flashing systems for stone siding. Locate and install the proper flashing system that the slate siding will be installed on.

Install a heavy felt construction paper over the slate installation area, this will provide a moisture barrier. Stretch the paper between the studs (framing) or attach it to the structure's sheathing using a hand stapler. Install "chicken wire" or wire mesh over the construction paper, tack it in with a 1/2-inch hand stapler. Use roofing nails to attach the wire every 6 inches.

Mix mortar mix in a wheelbarrow for the "floating" or application of the mortar bed that the slate siding will be installed on. Use a mortar mix that contains lime to aid in the stickiness of the mortar. Mix to a medium thickness. Scoop the mortar with a flat trowel and apply it to the hawk. Apply the mortar to the wire mesh, press in to achieve a flat working area. Apply an even consistency (up to 1/2 inch) of mortar and allow the area to dry. Smooth out with a wood float, knock down any high areas. Allow the mortar to dry for 24 hours before proceeding.

Lay out the slate. Typically siding begins on the bottom of the wall and rests on the flashing at the bottom of the wall. Start at this point. Find the center of the wall and mark a perpendicular or "plumb" line going up. Start at either this point or start with a full piece at at corner (if possible). Mix thin-set mortar in a bucket and apply the thin-set to the immediate installation area with a notched trowel. Continue installing until you have finished the installation of full "courses" or pieces.

Use a construction pencil and mark the pieces of slate that need to be cut. Use a wet tile saw to cut the pieces and use a 4-inch grinder to cut inside corners and curved cuts. Dry the pieces off before installing them with a dry rag.

Allow 24 hours before applying grout to the slate siding. Use a grout float and press the grout into the seams and grout joints, take care to not apply excess grout to the surface of the slate. Allow time for the slate to dry then use a clean sponge and bucket of water to clean and work the grout joints. Clean the surface of the tile as well and perform a final clean wash. Allow an additional 24 hours to pass before applying a tile sealer to the slate.