waterproofing coating
TRANSCRIPT
Things to consider before selecting Waterproofing Membranes
Whether it’s a new build or an existing structure, all waterproofing applications
should be installed by experienced, licensed waterproofing contractors. Our
objective in this article is to make some useful recommendations for the things
you may be unaware of on the subject of waterproofing.
1. Evaluate the perimeter of your house: Make sure that the ground next to
your foundation slopes is away from the foundation, and not towards it.
Dirt which is installed as ‘Backfill’ around the foundation, typically at
retaining walls, tends to compact over time and settle lower than the
surrounding dirt, which is already packed and established. This causes the
overall falls to slope towards the house, as opposed to away from it. If
necessary/practical, add more dirt up against the foundation to create at
least a 150mm per metre slope against the foundation. The top of the dirt
should be at least 150mm below the sill plate so that there is no ground
contact which can cause certain building materials to rot over time.
2. Treat your walls with products such as Drylok or Xypex if you have
minor leaks: Drylok is waterproofing compound, not a water sealer. It
expands as it cures effectively to become part of the wall. Xypex is more
akin to applying a waterproof concrete on the surface that bonds with it.
Because Xypex relies on the presence of moisture to form its waterproof
crystalline structure, if a Xypex application does have small areas of water
penetration it would seal itself as it cycles through moisture. You should
expect to pay up to 4 times as much for Xypex as you would for the
Drylok system. The major limitation with these types of solutions is that
groundwater which is underneath the basement floor or at the wall/floor
3. Junction will generally be built up with a significant amount of negative
pressure, due to the weight of groundwater above it.
4. Repair defects in walls such as cracks: If you notice a crack in a concrete
wall, it may continue right through the wall to the outer surface and is a
potential source of water penetration. Any cracks that are not subject to
thermal or structural movement can be treated with DRYLOK Fast Plug,
which is very effective in sealing cracks in masonry.
5. Consider installing a sump: Simply put, this is a hole in your basement
floor which contains a pump. When the water level in the sump rises too
high, a pump kicks in and draws the water out of the sump, discharging it
approximately 3m away from the residence.
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