Repairing Hardboard Lap Siding

If needed replace the sheathing behind the siding using 1 2 plywood covered with builder s felt or housewrap.
Repairing hardboard lap siding. Fortunately you can repair masonite hardboard siding with wood putty. Holes are a prominent problem with masonite siding. If you can see black marks or streaks anywhere on your masonite siding it is a sure sign of being compromised by water. Be sure to stagger the joints see photo 1.
Repairing hardboard siding if water seeps into joints between hardboard panels or penetrates through small holes it will cause the panels to deteriorate. Make sure to scrub only the compromised area of the siding so that the structure remains unaffected. When washing allow it to dry completely for a day or two before treating or curating it further. Be sure the top one goes through both boards.
Promptly repair holes in masonite hardboard to prevent moisture from further permeating the siding and compromising its structural integrity. Most hardboard siding is 7 16 in. Besides painting the siding can also be scrubbed for cleaning purposes. Immediately fill holes with a flexible all purpose filler such as pre mixed bridging and patching compound following label directions.
Thick so set your blade depth carefully to avoid cutting into other courses. You might notice bulging along the bottom edges a loose layer or soft. Use a 4 foot level to check and then hammer in another nail. Remove the deteriorated hardboard siding using a pry bar and chisel being careful not to damage the good siding above it.
If you re replacing more than one board in a run simply hammer a nail into the top corner to support it and then move half way down the board. Remove the siding panel that is damage and install a fresh hardboard siding panel. Use shims to lift the boards so you can easily get at the one you re cutting. Remove the damaged siding panel using a claw hammer and extract the nails left on the wall from the old panels using tin snips.
Check the siding panel for molds holes or any damage.