Epoxy putty is a commonly recommended wood filler for use in repairing woodpecker damage.
How to patch woodpecker holes in cedar siding.
Use the putty knife to scrape away the excess then.
Mix up a batch of lightweight structural adhesive epoxy putty on a scrap board.
Just as with the small holes above fill the cavity with spray foam insulation to get a tight weatherproof seal.
Step 5.
Unfortunately cedar siding seems to get a lot of damage from woodpeckers particularly if the house is adjacent to a wooded area.
If the hole happens to be very large cut the cavity into a square.
Step 1 save sawdust.
On a warm day mix the two materials with a putty knife then spread the mix over holes in the siding until the opening is completely covered.
Step 2 prepare the backing.
Filling woodpecker holes in wood siding.
Step 4 mix the repair putty.
Repairing large holes in cedar siding is a little more involved.
Use a putty knife to apply the putty liberally across.
Smear a generous layer of the epoxy putty over the holes.
Step 3 glue the backing into place.
Use a hole saw to make a perfectly circular hole over the existing hole.
Use a putty knife to force the filler inside the hole making sure to fill in the hole and to completely cover the opening.
Scoop out a golf ball size glob.
Large holes like you are describing sound like roosting or nesting holes.
Fill the siding holes with wood filler.
How do i repair woodpecker holes in wood siding.