We live in Vancouver in a 90 year old home. We have decided to renovate our basement. The contractor discovered serious mould in the basement and as a result it has been necessary to replace the drain tiles. The excavations have been completed and our home looks a like a WW1 battlefield. The issue is the type of sealant to be affixed to the foundation walls. The drainage contractor has already rolled on two coats of the black goop. This is necessary but is it sufficient? I do not want to undergo this process again. We have no intentions of moving. This is our dream home. The issue is whether to affix the plastic "Dimple Board" to the foundation walls. Does this help? Is it necessary? The contractor wants to charge an additional $3,000.00. Is this reasonable? This exercise has become very expensive and we want to contain our costs.
I do not think you need the dimple board. What counts is that you do not have water pooling up against the foundation and that your drain tiles down below are working properly to carry any ground water to a sump pump.
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