Patching Cement Board Siding

Apply the patch product and paint on a day with no rain to speed drying and curing time and prevent water damage to your patch project.

Patching cement board siding.

Dip a soft bristle brush into the solution then scrub the cracked area of fiber cement siding to remove dirt and debris. Put on a pair of rubber gloves. Patching fiber cement siding. Mix a solution of 1 2 cup trisodium phosphate and 1 gallon of water.

0 312 in x 8 25 in x 144 in hardieplank primed woodgrain lap fiber cement siding panel. Use only as much water as the manufacturer recommends. If its blind nailed you can usually stick a couple of wood shims under the next clap to give you a bit of clearance. Fein multimaster is excellent for this.

Refer to manufacturer recommendations for products that are compatible with fiber cement. If you are removing more than one level of siding in an area start at the bottom and work your way up. These areas include but not limited to penetrations flashings plank and trim connections and in some cases between plank joints. Use the carbide grit blade to cut out the bulk of the clap.

Using a stiff brush mix the patch material specifically intended for fiber cement following the manufacturer s directions carefully. Fiber cement siding repair or patching re applying caulking when it has begun to show signs of wear can help keep moisture from getting into the wall cavity. Make sure that the siding is completely dry from the washing and that the caulk and patches are dry too. Hardieplank is a cement lap siding product used on commercial and residential exteriors and is designed for very low maintenance and a long useful life.

Remove the nails and countersink any nubs that might prevent your new siding from sliding up under the old. 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. Use only completely acrylic paint and apply with rollers. 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.

For holes larger than 1 2 inch in diameter use a carton knife or carbide tipped tool to cut a v shaped groove behind the edges of hole. The e cut blade works great for cuting out the nails. This will allow the patching compound to lock in behind the cement board. Depending on the size of your house you may need a ladder to reach the area of siding near the roof.

The cement basis of the product dictates the use of thin set mortar to properly repair cracks or holes. Though it is a tough wearing product the surface of the siding can sometimes be damaged during installation by unusual wear or by impact.