How To Repair A Chip Edge In Cement Fiber Siding

Mix a solution of 1 2 cup trisodium phosphate and 1 gallon of water.

How to repair a chip edge in cement fiber siding.

Repair or patching fiber cement board siding dents chips cracks and other minor surface damage in james hardie siding and trim products can be filled with cementitious patching compound. Allow the patch to thoroughly dry and apply another thin layer of patching material if the first layer shrank during the drying process. Use a plastic putty knife to apply the patching material to the damaged area filling in the area and shaping the patch to match the original contours of the siding. Step 2 sand over the damaged area lightly but thoroughly with a medium grit sandpaper to smooth any jagged edges and create an easy grip surface for the patch product.

Scrub and clean the surface of the repair area with a stiff bristle brush. Fiber cement lap siding is heavier than wood and requires a special diamond tipped blade or a tungsten carbide saw blade to cut. Dip a soft bristle brush into the solution then scrub the cracked area of fiber cement siding to remove dirt and debris. To clean it start by taking a light wire brush and dipping it in a buck of water mixed with a cup of bleach and some dishwashing detergent.

Refer to manufacturer recommendations for products that are compatible with fiber cement. If your repair includes the very bottom tier of siding add a spacer strip the thickness of your siding along the entire bottom edge to mimic the angle of your overlap. Put on a pair of rubber gloves. Brush away any chipped paint small loose pieces of siding or anything else that mars the plane of the siding.

Rinse the siding with clean water to remove the soapy residue.