06:17AM | 07/25/06
Member Since: 07/24/06
3 lifetime posts
I live in a classic turn of the century Cmabridge (MA) three family. The basements here are constructed of a stone foundation (with lime morter)below grade and a double course of brick above grade. The florr is sand

I am renovating and starting literally at the bottom and working my way up. I just poured the new floor slab. I put in an interior perimater drain consisiting of a 4" diameter perforated PVC drain pipe wrapped in filter fabric, embedded in a channel filled with 3/4" stone - this connects to the sump pit. I put a 6 mil vapor barrier down and poured a 4" reinforced concrete slab.

I already realize I made a few mistakes.

1. I should have removed 4" of sand and put the stone down in the entire basement, not just around the edges.

2. I should have put down 1" rigid insulation

3. I should have run the edges of the vapor barrier up the sides of the slab to keep the water from the foundation migrating into the side of the slab.

With this in mind...

I want to finish one part of the basement and make the other part clean storage.

I was thinking of using UGL drylok floor paint, but after reading some documents from BSC I am hesitant to do so as I might just get more water condensing on the floor if the concrete can't absorb the vapor

Should I paint or not?

Second related question is I was going to put up 2x4" wall all around the interior perimiter. I intended on using a sill seal under the 2x4 to isolate it from the slab.

What is the best combination of foam/insulation and memabrane water proofer to insulate the wall? The more I read about moisture, the more I see that using the wrong combinations of products can create micro climates behind walls and cause long term issues.

I found one diagram in a BSC document called "READ THIS before you design, build or renovate" it shows almost what I have on page 14, but I don't have a way to connect wall drainage to the interior drain.


04:12AM | 07/26/06
Member Since: 03/03/05
273 lifetime posts
Without seeing your situation, it is hard to make a suggestion. If you have any concerns of moisture, DO NOT trap moisture between your wall. It will become a breading ground for bacteria and mold. I live close to you and have years of experience dealing with basement issues. I'd be happy to visit you if so desired.

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