• 1-3 Days Delivery
  • Low Trade Prices
  • Free Technical Advice

It’s business as usual at Permagard. We’re offering a 1-3 day delivery service and a click & collect service from our Bristol trade counter.

Basement Waterproofing

1-16 of 29

Set Descending Direction
Load More

Learn more about External Waterproofing

External Waterproofing Systems for Basements

Conventional barrier tanking that is subjected to water pressure from the surrounding ground will fail unless the barrier is 100% defect-free. Even a land drain cannot effectively deal with perched or trapped water higher up against the water retaining wall. With the rise of local water tables, more and more basements and earth retaining foundation walls are being subjected to hydrostatic water pressure leading to water ingress into the building.

If a system is put in place to alleviate the hydrostatic pressure from the waterproofing system, the risk of failure is significantly reduced.

The Permagard External Structural Waterproofing System is designed to firstly waterproof the substrate with a brush or trowel applied liquid waterproofing material then remove hydrostatic water pressure from the building with a specially designed Cavity drain membrane - the PermaSEAL Geodrain .

Newton 410 Geodrain


A spray application of Aida Kiesol silification spray causes the masonry pores to narrow making the surface water repellent. This also chemically binds the bitumen waterproofing product to the substrate.

Primary waterproofing:

Two coat application of one of the external waterproofing coatings to create a flexible high build waterproof coating.

Secondary waterproofing:

Cover the surface with PermaSEAL 8 Geodrain Membrane or PermaSEAL 20 Geodrain Membrane or Newton's Geodrain cavity drainage membrane. These products allow water from the surrounding media to freely drain through the filter fabric into the cavity created by the studs. The water then drops down to the land or French drain situated below floor level, which in turn takes the water away to a suitable drainage point. These cavity drainage membranes immediately alleviate the hydrostatic water pressure from the building. You also have the option to use Hydroprufe 3000 - an external self-adhesive tanking membrane - in combination with these Geodrain membranes.  

The advantage of this external masonry waterproofing system is that a primary and secondary waterproofing barrier is created. This absolutely minimises the risk of defects. Also, the structural waterproofing system is highly flexible so if the building settles or moves in the future you can be safe in the knowledge that the external masonry waterproofing will move with the building and remain watertight.


Permagard - Providing Solutions. Inspiring Confidence.

If you require further information on External Structural Waterproofing please contact one of our technical advisors on 0117 982 3282. We’re here to help!

You can also benefit from big savings when you buy our PermaSEAL Geodrain Membranes in bulk.   

To find out more then read our Guide to External Waterproofing or find out more about what external tanking options there are available.