Location: Castilian Street, Northampton, NN1 1JX

Type of property: Victorian terrace constructed of 9-inch brickwork with a physical damp proof course

Services used:

  • Damp survey / Basement inspection
  • Cavity drain membrane waterproofing (BS8102 / BS8500 compliant)

Materials Used: 

  • Delta MS500 Wall Membrane
  • Delta 3mm Mesh Membrane
  • Delta MS20 Floor Membrane
  • Delta Floor Drainage Channels
  • Delta V3 Dual Sump Unit with Control Panel, Alarm, and Battery Backup System
  • Polysil TG500 Sealer
  • Delta Fixing Plugs

Problem:

The basement was of brick wall construction with a solid floor; the walls had been fitted with an 8 mm mesh drainage membrane with render over, and the floor finished with bonded vinyl and bonded carpet preventing full inspection.

 

The rest of the inspection revealed evidence of groundwater ingress at the wall/floor junction in the basement, resulting in salting to the wall plaster and wet rot to the skirtings. During periods of heavy rain, water ingress resulted in wetting of the floor.

 

The existing installed system of waterproofing was doomed to fail due to:

  1. A lack of correct drainage channels to the floor slab.
  2. The absence of an adequate sump chamber with pumping to isolate the waterproofing system from the sewerage system.
  3. Non-compliance of the existing setup with BS8102 and BS8500 standards.

Works completed: 

We recommended installing a full Cavity Drain Membrane System compliant with BS8102 and BS8500.

 

We:

  • Removed all existing finishes, plaster, floor coverings, and failed membrane down to the structural floor slab and bare brick walls.
  • Levelled the floor slab and cut an deep pit into the floor slab for the sump unit.
  • Formed a indent to receive perimeter drainage channels.
  • Supplied and installed Delta MS500 Membrane to the internal walls up to full ceiling height (and Delta 3mm mesh membrane to the stairwell).
  • Supplied and installed Delta perimeter drainage channels into the floor indent.
  • Installed a Delta V3 dual sump unit complete with a high-level alarm, control panel, and battery backup system.
  • Applied Polysil TG500 sealer to the surface of the floor slab.
  • Supplied and installed Delta MS20 floor membrane, securely linking it to the wall membrane.
  • Installed moisture-resistant chipboard flooring over the floor membrane.
  • Fitted treated softwood battens using Delta fixing plugs, applied plasterboard, and finished with a set coat plaster.

 

We also advised the client to instruct a drainage survey to investigate whether the sewage system was venting directly under the floor slab

BEFORE

DURING

AFTER

Property Conservation Services Treatments