How to patch a hole in cement board

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.

Allow the patch to thoroughly dry and apply another thin layer of patching material if the first layer shrank during the drying process. The good news is, Hardie siding is easy to repaint! Whether you 've got a ColorPlus finish or custom paint on your existing Hardie siding , you don't have to prime or sand the original finish.

Most James Hardie siding is installed with colour matched caulking around windows and at corners. If you wanted to patch the hole I'd probably just caulk it, but if you wanted it to set up hard, use a stick of jb weld or similar and shove the putty in the hole. Then you can drill a pilot hole in it once it's hard. How do you repair a hole in an asbestos wall? How can I repair damaged asbestos sheeting?

Cracked asbestos — You should seal the crack with a product like PVA glue, polyfiller or paint. Small hole in asbestos — To encapsulate any asbestos fibres and protect the sheet from further damage, exposed edges should be painted or sealed with a PVA glue solution or similar product.

What do you use to fill outside nail holes? Then any type of exterior spackle or painter's oil putty will fill the void. A hard filler like bondo will be prone to pop out the next season when the nail moves again.

A gel epoxy is a very costly but most permanent solution. Layer mortar in the hole with a trowel. You can use a putty knife to spread the mixture over a small hole.

Work the mixture into the hole with the tip of the tool. Cover the sides of the hole first, then begin filling the center of the hole. If you wait for each layer to dry before adding the next one, you can create a stronger patch. Keep the patching material roughly level with the surrounding concrete. Adding more than you need is okay. You will have a chance to eliminate the excess before it dries. Patching a vertical surface, such as a wall, is pretty much the same as patching a hole on the ground.

Push the mortar deep into the hole at first, then add more layer by layer. It will stay in place. Part 3. Drag a board over the hole to remove excess mortar.

Select a board that is at least 1 ft 0. Lay it across the hole on one side. Then, drag it over the hole. While dragging it, move it back and forth in a sawing motion to flatten the patch. For vertical surfaces, try dragging a board down over the hole and then going back over the patch with a trowel. Smooth out the remaining mortar with a trowel or float.

If you have a float, which is a flat-bottomed tool designed for smoothing concrete, try using it on the mortar. Move the tool back and forth across the mortar a few times. After a few passes, the mortar patch will look flat and blend in well with the surrounding concrete.

Use a wood board to remove any excess before smoothing the mortar out and letting it harden. Cover the patch with a plastic sheet to protect it from damage. The patch will be pretty vulnerable until it has had a chance to cure. Purchase a concrete insulation barrier, spread it out across the patch, and pin it in place. Weight it down with heavy objects like bricks. Wait at least 6 hours, then mist the patch with lukewarm water. Quick-drying patching material usually takes about 4 to 6 hours to solidify.

After it has become hard to the touch, lift up the plastic sheet. Use a spray bottle or a hose to lightly dampen the concrete with lukewarm water. Adding the water causes the concrete to continue curing, making the patch even stronger. Continue misting the concrete twice a day for at least 7 days while it dries.

Spray it each time with a light amount of lukewarm water. The patch continues to grow stronger as it cures. Even though this may seem like a long time, it is worth doing if the manufacturer recommends it. Once the concrete has finished curing, remove the plastic sheet and test it out. It should be level with the surrounding concrete and feel hard to the touch. Include your email address to get a message when this question is answered. If your concrete patch sticks out after it has cured, roll a concrete grinder over it.

Wear down the concrete until it is flat and level with the old concrete around it. Helpful 0 Not Helpful 0. You can also repair damaged steps and slabs by following the same steps. However, you may need to build a wooden frame to pour and hold concrete in a specific area. Since concrete is porous, it is pretty easy to paint. Roll a masonry primer and paint over it. Concrete releases dust that can be irritating to breathe in.

Always wear a dust mask, safety glasses, and work gloves. You Might Also Like How to. How to. Expert Interview. More References About This Article. However, drilling through cement-fiber siding goes better if you use a carbide drill bit, as opposed to a regular steel drill bit.

Cement-fiber siding can be drilled while installed on a house or prior to installation. Otherwise, the board siding may snap during drilling. Just finish it with a setting-type joint compound, which comes in lb. Setting-type compound is stronger and more water-resistant than the type that hardens by drying.

The installation guide for Hardie Board, which is a brand of cement board siding recommends using caulking to fill nail holes. Once the caulk is dry you can touch up the paint. To patch holes and depressions in siding of any kind, follow these steps: Clean the hole or depression you plan to fill.

Roughen the area you want to patch with grit sandpaper for a better bond. Fill the area with patching compound. Allow the compound to harden and then sand it smooth. Fastening Siding Use hot-dipped galvanized or stainless steel nails. Siding can either be blind nailed at the top or face nailed at the bottom. HardiePlank is a type of lap siding that contains cement fibers, making it extremely durable.

HardiePlank is available as ready-to-paint or with a color layer. Although the siding does not require drilling pilot holes, you may need to run wire or cable through the siding, necessitating drilling a hole.

Slide the thin edge of a flat pry bar carefully under the lower edge of the first piece of HardiePlank siding to be removed. Pry the piece of siding out toward you gently to let you see the nail or screw patterning of how the planks have been fastened to the under-structure.