Waterproofing for Enhanced Flood Resistance

Waterproofing Solutions for Enhanced Flood Resistance

When it comes to defending properties and structures against floods, waterproofing should be considered, with two distinct approaches: Negative Waterproofing and Positive Waterproofing.

Negative Waterproofing:

This method involves applying waterproofing measures to the inner surfaces of a structure, creating a barrier to resist water infiltration.

A prime example is internal tanking. While such measures can sometimes be disruptive, they can be seamlessly integrated post-flood during the restoration phases, yielding cost-effective benefits.

In historic structures, careful consideration is paramount to safeguard the fabric of the property.

Another effective strategy is the utilization of a ‘fillet seal,’ effectively sealing the vulnerable junction between walls and floors, mitigating water penetration.

Positive Waterproofing:

This approach concentrates on bolstering exterior walls against water intrusion.

Although rendering might seem like a go-to choice, it can compromise the damp-proof course (DPC), leading to unforeseen challenges. An increasingly favoured technique involves applying advanced waterproofing creams, such as products like Stormdry and Waterstop. While these creams can be effective in handling minor flash floods, their efficacy diminishes in deeper or prolonged flood events.

Re-pointing with an additive such as ‘Additive No.2’ can yield significant enhancements in flood resistance. This unobtrusive process ensures effective results upon completion. Historical structures can benefit from breathable additives as an alternative.

Further Considerations:

A critical factor deserving attention is maintaining the seamless continuity of the waterproofed surface. This holds particularly true for flood barrier rails, which should be affixed to the waterproofed surface to prevent them from being outflanked and water bypassing the fixings.

The propensity to underestimate the extent of water ingress through masonry is a common oversight, yet its impact can be substantial.


At Flood Protection Solutions Ltd, our adept team of Master Builders can assist with your repointing and waterproofing requirements. Do not hesitate to Contact Us to discuss your specific needs.

Watch How to Flood Proof a Property with Simon Crowther BEng (Hons) C.WEM MCIWEM:




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After 4 floods in 16 years, the Water-Gate Barrier was used in November and December 2012. The relief when it prevented what would have been a 5th and 6th flood was enormous. The best part is the piece of mind that follows.

Pam, Nottingham Resident

I would not hesitate to recommend Flood Protection Solutions, a very professional and detailed service.

Neil, Hebden Bridge Resident

The service that was provided was very good, communications were excellent, and they dealt with our issues in a very responsive and professional manner.

Trevor Palmer, Sellafield Ltd