I've got to redo a concrete trough drain in front of my garage door. My
ashphalt driveway stops about 12" short of the pad, allowing room for a 6"
wide trough and another 6" or so of finished concrete.
The way I've figured it (and for how its going to cure), the form will need
to stay in place forever. This is because the rails of the grate system
will sit on top, and once cured, the form becomes a functional part of the
design :) As this is a "test" (not sure why the existing pour
disintegrated so badly, so I don't wanna spend huge bucks to have it happen
again....), I'm going to use wood for the form...
My question is this....what can I do to the wood form to further preserve it
from moisture damage? I'm going to use pressure treated stock, and
considered coating it in tar and letting it harden before pouring. The form
will be completely invisible, under plate steel, so aesthetics make no
difference. Also, any recommendations for enhancing the strength and
longevity of the pour? I've considered getting 3.5" screws and driving them
from the inside of the form out, all along the length of each side to
provide "fingers" for the concrete to grab...I've got the following on my
- using 1/8" hardboard strips to keep the garage pad and the new concrete
- using a concrete "adhesive additive" adding to both the new concrete mix
and brushed onto the very hard underlying existing concrete
I've read about an acrylic fortifier? is it worth looking for? any other
advice? sorry for the long winded post....I'm tackling this project this