Serving Berkshire & Surrey 50+ Yrs Combined Experience
01784 918 841 info@above-water.co.uk
Above Water
ABOVE WATER
Damp Proofing Specialists
Navigation
Book a Survey
BS 8102:2022 Technical Case Study

Basement Cavity Membrane with Dual Pump Station

Complete transformation of a flooded Victorian brick cellar into a bone-dry, fully habitable space using BS 8102 Type C Cavity Drain Membrane and automatic twin sump pumps.

Location: Windsor, Berkshire Duration: 6 Working Days
Flooded Unsealed Cellar With Water Ingress
🔴 Before Work
Flooded Unsealed Cellar With Water Ingress
Dry-Lined Cavity Membrane & Dual Pump Station
🟢 After
Dry-Lined Cavity Membrane & Dual Pump Station

The Site Problem & Challenge

The property owner experienced severe groundwater ingress through solid brick foundation walls and earthen floor during high rainfall events. The cellar was completely unusable, damp was travelling up to ground-floor floor joists, and humidity registered at 92%.

Our BS 8102 Engineering Solution

Installed 8mm studded high-density polyethylene (HDPE) wall and floor cavity drainage membranes, perimeter AquaChannel perimeter drainage conduits, and a dual submersible vortex pump station equipped with automatic float switches and battery backup inverter.

ON-SITE PHOTOGRAPHY

6-Stage Installation Photo Log

1. Flooded Cellar Ingress

1. Flooded Cellar Ingress

Active groundwater seepage through Victorian brickwork.

2. Floor Prep & Perimeter Channel

2. Floor Prep & Perimeter Channel

Subfloor channel excavation for perimeter AquaChannel drainage.

3. 8mm Studded Wall Membrane

3. 8mm Studded Wall Membrane

HDPE studded cavity drain membrane mechanically anchored.

4. Floor Membrane & Drainage Conduit

4. Floor Membrane & Drainage Conduit

Interlocking floor drainage membranes directing flow to sump.

5. Dual Submersible Sump Installation

5. Dual Submersible Sump Installation

Twin automatic vortex pumps with battery backup power inverter.

6. Completed Grade 3 Habitable Basement

6. Completed Grade 3 Habitable Basement

Dry-lined, insulated, and plastered.

System Specifications & Components Installed

  • Type C Cavity Drain System (BS 8102:2022 compliant)
  • High-density 8mm / 20mm HDPE studded waterproofing membranes
  • Perimeter AquaChannel drainage conduit with accessible jetting inspection ports
  • Twin 240V submersible vortex pumps with dual level float sensors
  • Uninterruptible Power Supply (UPS) auxiliary battery inverter unit
  • Acoustic and visual high-water warning alarm system

The Result: Permanent Dry Habitable Space

Achieved 100% dry Grade 3 habitable basement environment. Ambient relative humidity reduced to 48%, protected against future groundwater ingress.

Get a Free Basement Survey

Speak directly with our specialist. No hard sell, just expert advice and an honest quote.

Send Enquiry 01784 918 841

Have a Flooded Cellar or Basement?

Our BS 8102 specialists cover all of Berkshire and Surrey. Book a free survey today.

Book a Free Survey