Structural Waterproofing to British Standards
I design and install below-ground waterproofing systems that keep basements, cellars and retaining walls permanently dry. My work follows BS 8102 : 2022 and the PCA Code of Practice, ensuring every design considers water pressure, structure type and intended use.
Most projects start with an assessment: groundwater conditions, drainage strategy and structural detailing. From there, I choose the right system — or combination — to provide long-term protection.
A surface-applied system that resists water pressure by forming a continuous barrier on the structure’s external or internal face.
Typical materials: cementitious tanking, bitumen membranes, or crystal-growth coatings.
The structure itself provides the waterproofing, often using integral water-resistant concrete or admixtures.
Used in new build basements, lift pits and car parks. We do not do this as can't retrofit
A cavity membrane collects and diverts water to a drainage channel and sump pump.
The most reliable retrofit solution for existing buildings.
BS 8102 encourages “combined protection” — for example, Type A barrier render plus Type C drainage — to reduce risk and allow for maintenance.I design each system to suit the structure and ground conditions so no single failure causes a leak.
Risk assessment and design review as per Clause 4 BS 8102 : 2022S
pecification of drainage channels and pump capacity
Vapour-control and dry-lining options for habitable spaces
installation process
1️⃣ Survey & Design – Assess site and draw up waterproofing plan.
2️⃣ Preparation – Clean surfaces, repair defects, prime substrate.
3️⃣ Installation – Apply membranes or renders, fit channels and pumps. (all electrcial works installed and tested by me (I was an NICEIC registered electrician for 8 years prior to structural waterproofing))
4️⃣ Floor & Wall Finishes – Dry-lining or screed finishes installed with vapour control layer.
5️⃣ Guarantee – Issue written certificates and maintenance advice.
MATERIALS & SYSTEMS
Delta Membranes / Pumps — reliable, serviceable components
Permagard Cavity Drainage Systems — BS 8102 compliant membranes
Sika 1 Render / KA Tanking — where barrier layers are needed
Vapour Control Layers & Insulation — for warm, dry interiorsAll products are installed to manufacturer specification and PCA standards.
MAINTENANCE & AFTERCARE
All works comply with
:BS 8102 : 2022 Code of Practice for Protection of Below-Ground Structures
PCA Structural Waterproofing Design Code of Practice
NHBC Chapter 5.4 Basements for Dwellings
GUARANTEE & COMPLIANCE
Every basement waterproofing project comes with a written 15-year guarantee, with optional insurance-backed cover (IBG).
All work follows:
BS 8102 : 2022 – Protection of Below-Ground Structures
PCA Code of Practice for Structural Waterproofing
NHBC Chapter 5.4 – Basements for Dwellings
design Your Waterproofing System Properly — Before You Build or Renovate
If you’re planning a basement conversion or have ongoing water ingress, let’s discuss the right system for your property. I’ll survey, design and install to current British Standards with full documentation and guarantees.
newdpc.co.uk specialises in structural waterproofing to BS 8102 : 2022 throughout South London, Surrey and Kent.All systems are designed and installed in accordance with PCA best practice and can include insurance-backed guarantees.
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