How To Repair Cement Board Siding

Blind nail the fiber cement siding in place starting with the bottom piece.

How to repair cement board siding.

Cut the fiber cement siding to length wear approved dust protection. Put on a pair of rubber gloves. This will allow you to remove the nails without damaging the top piece of siding. Then using a pry bar gently lift the bottom edge of the overlapping siding.

However even this stuff isn t impervious to the test of time and the forces of nature so you might find yourself needing to give your siding a little sprucing and repair from time to time. Dip a soft bristle brush into the solution then scrub the cracked area of fiber cement siding to remove dirt and debris. Mix a solution of 1 2 cup trisodium phosphate and 1 gallon of water. Work your way down the board prying the bottom edge up and loosening the nails.

Refer to manufacturer recommendations for products that are compatible with fiber cement. 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. Watch this video to find out more.

Remove any nails from the top piece of good siding. Rinse the siding with clean water to remove the soapy residue. Put on protective eyewear and a face mask. 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.