Relieving Hydrostatic Pressure in Basements“Are sump pumps the best way of relieving hydrostatic pressure on basement walls from groundwater ?”
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Note:
Whilst the OnlineWaterproofingShop Team believes the keeping water out of your subgrade walls is most effective. Concrete structures are porous.
Waterproofing waterside is the ideal or best solution. Unfortunately it is not always possible. But installing a sump pump in a basement will create a weak point.
Disadvantages of a Basement Sump Pump Install
- Allow another point for water entry.
- presence of a dampness allows mould to grow.
- cutting the hole or drainage channels around the basement may expose reinforcement.
- corrosion of reinforcement creating concrete spalling.
- chemical erosion of unprotected concrete as fresh water continually runs through the wall.
- Physical damage caused by fresh water flowing through any crack or porous area in the slab.
- Failure of the drainage system inside or out.
NO you say … Take NOTE – The Grand Canyon was not formed in a day?
The idea behind fitting a sump pump is born out of ignorance. The mentality “if you can’t stop it, pump it out” is steeped in danger!
In the first instance you need to break into a reinforced concrete base. The slab has been specifically designed to take the loading. Especially in lift shafts and possibly other areas of the building. This raft (slab) WILL NOT be designed for someone to come along and cut a hole into it. Which will invariably involves exposing the steel reinforcing or worse cutting through it.
Far better to lock out the water from the structure. This is best done from the exterior/water side. However just relieving hydrostatic pressure drilling and pumping just creates more problems. Negative/interior side waterproofing is the next best solution.
OnlineWaterproofingShop Team
When your membrane fails on the water side and it isn’t possible to be relieving hydrostatic pressure. Then watch how a dry wall is achieved with Drizoro Products in the video below Further information on how masonry wall drys is found here – cementitious crystalline process
Drizoro withstands more hydrostatic pressure than the blockwork would before crushing. The crystalline growth promoted by sealing with Drizoro eventually drys the wall preventing further damage to reo and the cement itself.
https://basementhealth.org/services/basement-waterproofing-hydrostatic-pressure/
This article promotes internal drainage sump pump. Drainage outside to inside to relieve hydrostatic pressure.

When you can’t drain the soil of water, to relieve water pressure, in your basement sitting in water. Then you need to Drizoro it.