Roofing tar for basement waterproofing
I’m remodeling a basement that gets a few trickles of water every year. I’m going to tackle some grading issues outside that I think will alleviate most of the direct water problems, but the homeowners say that some water leaks in when the water table’s really high with heavy rains.
The previous owners had skim coated (a good 1″+ thick) over the existing concrete walls. It looks like any moisture coming through was seeping down between the concrete and mortar skim coat.
There’s one portion that will remain unfinished. What I want to do is create a small gutter behind the PT bottom plate and direct it towards that area. I had done this on one other basement with a Dymonic caulk, but that was a very small area that I was finishing. This basement is much bigger and I was thinking of doing this:
Embed the PT bottom plate in a thick line of fiber emulsion asphalt goo. Run a 1 1/2″ z flashing along that that also embeds the “Z” part in the asphalt. Make sure the asphalt really covers over the lip of the flashing. Then run a bead of Dymonic or Lexel or similar along the front of the PT plate.
I don’t want any water to get under the PT plate, but if it did, I’d rather have it get stopped there before it goes into the finished space (wool carpet)
Do you think the asphalt will last for a long time in that kind of situation? No UV, no direct weather, hopefully a tablespoon of water or less every year depending on how well the exterior fixes can cure the problem….
Paul
Replies
step 1 ..
have a big talk with the clients let them know that you can't warranty water damage, mold, musty smells .. then think about the fact that the next owners could come a look'n for you!
is this a block or poured foundation?
after a heavy rain is a grading issue, seasonal is a water table issue, the only thing that will cure seasonal is a sump or weeping system, internal or external
using the sill plate as the side of a bathtub is just going to be problems
carpet on concrete is even worse, at the very minimum consider drycore or alike
don't restrict floor drainage to the drain with partition walls, build them on top of the drycore
others will add more ..