We are planning to finish this basement room (frame, drywall) and we
noticed, after emptying it out and after this unreal amount of spring
rain we've had, that there were moisture spots on the walls here and
there. Never saw before (white painted wall). Knowing ill effects on
drywall we had a group come out and assess a solution and they did
something similar to a French Drain install:
They jackhammered away most of the floor about from the two
earth-facing walls, 1' out into the room and dug down laying, I
believe, gravel and into that a periperated, corrugated plastic pipe
leading to a sump pit with pump installed at the end of the room.
They then pierced every cinder block section at the base allowing
water to drain out and places a ridged plastic sheet against the
bottom of the wall, then re-layed concrete, part of the plastic sheet
raised above the floorline. This should solve moisture issues
completely I am told - no more block filling with water, leaking.
But will there not be moisture from the earth venting up thru the
plastic ridged sheet, through the very route that the water would
drain from block down into the pipe? Would this minor moisture not
cause issues with drywall, even though the block will no longer be
moist? Or should this just take care of it?
There was never dripping water, just moist patches - no water pooling,