Subject: Question (rotted window sills)
Date: Mon, 13 Apr 1998
I'm restoring a 75 year old home. On the South side of the home the window sills are crumbling (I'm not sure if they have wet rotted or dry-rotted (my guess would be dry with the Southerly exposure). What would be the best product(s) to fix this? I would like to fill in and solidify rather than try to replace the sills.
First, leave the bad wood in place -- unless it's just falling out. Make
sure the wood is reasonably dry. Now, soak it 2 times with Clear
Penetrating Epoxy Sealer (CPES). On the first application, the wood will
soak up the CPES in large quantities; on the second less so, since a lot
of the wood will be filled with epoxy. Depending on the extent of the
rot, you may want to drill small holes up the side frames and inject the
CPES there as well. Kind of up to you, since you're looking at it and
determining where the rot is. Give the CPES 4 or 5 days for the carrier
solvents to evaporate away and the epoxy to cure.
After the CPES, we'd suggest you follow that with our Layup & Laminating
Resin, assuming that there are still cracks and crevices that remain
voids. This is a thick liquid that will seep around the CPES impregnated
wood and fill voids. It has a long cure time so it will go deeply into
the wood. Give it about 24 hours to cure.
Finally, if you require a final smooth surface, you can go back and
smooth over the top surfaces with Fill-It Epoxy Putty. This is sandable
and will accept paint easily.
The key to the success of all this is getting the CPES into every area
where there is rotted wood. You may have to explore a little,
pushing/poking/drilling to find how far the rot goes. If the wood is
reasonably dry, the CPES will do the rest -- it has remarkable
The final result will be sills that are stronger than they were
originally and no longer prone to rot.
How much of these products you might need will depend entirely on the
number of windows and the extent of the rot. If you give me more
details, I'd be happy to give you a quantity estimate. Our products are
always in stock and we ship same day as order.
And feel free to come back if you have additional questions.