Where do we start? Positive side waterproofing is, as has been stated,
placed upon the exterior or "Positive Pressure" side of the structure.
Typically this is applied during construction but with excavation, can be
installed at a later date. There are other means of positive waterproofing
of an existing building and this involves the drilling of holes at specific
intervals through the wall and injecting water reactive Acrylate Ester Gels
to form a Water Barrier. This active "positive side" waterproofing reacts to
water and prevents further water from coming in. This is used primarily when
access to the exterior of the structure is not available due to obstruction,
property lines, etc. While Europe has used these methods for some time they
have only been used here in New York for the past 5 years.

I apologize in advance but must disagree with Eric on his statement about
"letting water in then removing it". This can cause other issues such as
cavitations outside the structure due to the piping effect of the constant
flow of water as well as possibly raise the "humidity" level in a structure
which has its own host of problems, mold, etc.

Negative side, as previously stated is on the face of the interior wall and
is totally dependant upon the surface or after applying the waterproofing
the substrate integrity, as well as the integrity of the waterproofing
product itself as you get some nasty combinations of chemicals when you try
to stop "leaks" ( water plus other materials/chemicals)

Positive, during or after construction is always preferred, however until
recently negative was almost the only "remedial" solution available.

The Ultimate Lurker

-----Original Message-----
From: Darling, all I want is that you should be a pinhead -- Arlene
Croce [mailto:[log in to unmask]]On Behalf Of
John Leeke
Sent: Saturday, August 17, 2002 9:48 AM
To: [log in to unmask]
Subject: drainage


Could someone explain "negative and positive waterproofing."

J

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To terminate puerile preservation prattling among pals and the
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