I would use a combination of the solutions, I would seal the concrete,
use a vapor barrier and seal it with silicone and then drop in your
floor of choice. Anything from 1x on flat to 2x6 on edge if you have
the room.

If dampness is still a problem, you could resort to a dehumidifier but I
doubt that you will see a need for that.

BRuce

wrote:

Sorry... kind of a long winded poster here. I live in rainy Vancouver
in an old house that has poor drainage. We had a big storm yesterday
with enough rain to keep the basement sump pump going frequently until
late evening. I've been thinking of using my attached garage as a
workshop and today while cleaning out some junk I found small puddles
underneath some non-porous items lying on the floor (buckets, plastic
garbage bags etc). It seems there was enough moisture under the
concrete slab that some migrated up to the top and condensed in these
few spots. This has happened a few times before during these really
intense downpours we get 3-4 times a year.

I dread the thought of digging up around the garage perimeter to
attempt fixing or enhancing the existing drainage system. Will this
periodic excess moisture present many problems in the shop, even with
good heat and ventilation? I've been thinking of laying down a wood
floor anyway because the existing slab is quite sloped, so any power
tools I plan to buy would be a few inches above the concrete.

Your suggestions and comments would be appreciated.

Glenn
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BRuce