I have a small section of flooring that was ruined (went, dry-rotted) by a
leaking steam radiator.
The weight of the radiator along with the moisture has caused the wood to
deteriorate under a portion of the radiator, as well as a small section of
The home was built in 1929 (in New Jersey). The flooring is hardwood (oak
strip) tongue and groove over a subfloor which is set at 45 degree
diagonal (also tongue and groove) over the floor joists.
The damage is on the 1st floor, so I can see the subfloor from underneath
from the basement.
The damaged area is near an outside wall, and although the hardwood floor
and subfloor extend under the wall, the damage does not.
Also, the damaged area is not very large (less than 1 foot by 1 foot), and
between two floor joists.
I’m not sure of how to best repair the small section of subfloor before
replacing the section of hardwood flooring, but I’m concerned since the
(heavy) radiator sits on top of this area that it need be done
Any advice/instruction on properly repairing the section of subfloor?
Thanks in advance!
If you are exposing the top of the subfloor by removing the hardwood,
the problem is pretty trivial. Carefully cut the subfloor along the top
of the 2 adjacent joists, remove the rotted boards, and replace. If you
don't want to fight with the nails through that section into the joists,
cut the subfloor flush with the joists, and sister a 2x4 cleat to the
joist on each side, wider than the patch. If you don't want to fight
withe weaving in the diagonal patch, you can just cut the patch square
with the joists, add blocking below, and infill with whatever you can
find of correct thickness. Sounds like an ideal job for a mult-tool with
the plunge cutting blades. Cut down into joints, and cut that tongue
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