How to Repair Cracked Wood Lap Siding

What You'll Need
Epoxy Filler
Wood Filler
Putty Knife
Pry Bar
Nail puller
Replacement Wood Lap Siding

Cracked wood lap siding can be repaired in different ways, depending on the extent of damage. If the damage is minimal, the crack can be concealed by repainting the siding. If the crack is much bigger, it can be filled with epoxy or wood filler and repainted to conceal the repairs. Severe cracks, especially those caused by wood rot, can be replaced with a new piece of siding.

Step 1 – Repairing by Repainting

A very small crack, that forms a thin visible line on the wall, can be repainted to conceal the damage. Sand the entire area around the cracked line and wipe the residue off with a rag or cloth. Apply a coat of paint thinly over the area. Let it dry and apply another coat. Make sure that the paint is the same color as the rest of the siding. Check if the other wooden panels require repainting as well. This may also be a good time to repaint the entire wall. This is to ensure the color tones are even after repairs.

Step 2 – Repairing by Filling

If the crack leaves deep crevices in the wall, then it is best to fill the crack with epoxy or wood filler before painting. Use a putty knife to gouge out any rotten wood or loose debris in the crack. Sand the surfaces of the cracks if possible. Make sure to remove any loose debris and sanding residue before applying the filler. Mix the epoxy filler or prepare the wood filler accordingly.

Use the putty knife to insert the filler into the crack. Force the filler inside the crack and level it with the surface of the wooden board. Use an epoxy injector for the epoxy. Wait for the epoxy to cure. If when the epoxy dries it leaves low spots along the cracks, apply more until it becomes level with the boards. Wait for the filler to dry. Sand the surfaces and paint over it. It would be a good idea to repaint the entire board or the entire wall if necessary.

Step 3 – Replacing Lap Sidings

If a certain board in the siding requires replacement, use a pry-bar to remove the board entirely from the wall. To do so, locate the studs first. Put a wooden block underneath the pry-bar to avoid damaging the other boards. Lift the damaged board until the nails are exposed. Use a nail puller or claw hammer to remove the nails. Pull the board off from the wall.

Insert a replacement into the vacated area and align it with the other lap sidings. If the siding needs to be cut, be sure to prime the edges. Locate the wall studs and nail the board in place. Be sure to follow the manufacturer’s recommendation when choosing what kind of nails to use. Paint the new board with the same color as the others.