Here are a few tips on how to repair masonite siding.
How to repair water damaged masonite siding.
Scrub the brush around the hole to dislodge dirt and debris.
Scrape off flaking paint and debris from the damaged area using a paint scraper.
Once the identification has been done use a utility knife to cut through the damaged siding as accurately as possible.
The repair is simple if you follow the details in the illustration above.
We tear off the damaged hardboard and replace it with fiber cement siding.
Pack wood putty into the hole using a trowel.
Use a pencil to clearly identify the area.
Clean the hardboard with a stiff bristle brush.
Remove the damaged area.
The sheathing and framing sometimes need repairs too but that is less common.
In most cases the original layer of building paper or housewrap at the bottom of the wall was enough to prevent water infiltration and damage beneath the siding.
Scrub the surface of the rot or damage with a wire brush to remove loose fibers and soft spots.
Then apply some primer over the affected area.
In order to go about your repair project effectively mark out the area that has been damaged.
How to repair masonite siding with putty.
Slightly overlap the putty onto the surrounding hardboard by 1 inch.