Floor membrane and sump pump in situ in the damp basement
Floor membrane and sump pump in situ in the damp basement

Location: Headington, Oxfordshire

Type of property: Detached family home of brick construction over a stone-built cellar, with modern rear extension. Circa mid-18th century

Services used:

  • Free damp survey
  • Damp proof membrane installation by damp proofing technicians
  • Plastering
  • Carpentry

Materials Used: 

  • Concrete for floor slab
  • V3 Delta sump unit
  • MS500 Delta Wall Membrane and Delta plugs
  • MS20 Delta floor membrane
  • Polysil TG500 floor sealant
  • Softwood treated battens
  • Plasterboard
  • Plaster
  • Bullnose Skirting

Problem:

The damp cellar was constructed of exposed brick and stone walls with an uneven poor quality concrete floor. Access was via an open tread staircase from the kitchen. There was no form of basement waterproofing installed and the cellar was being used for storage only.

Evidence of ingress was noted to the floor slab with penetrating damp to the walls.

Works completed: 

In view of our observations on the day of inspection we designed a waterproofing system compliant to BS8102.

 

  1. Concrete pad removed at the base of the staircase
  2. Old window removed and discarded
  3. Old window bricked up to form recess
  4. Sump pit formed into the existing floor for Delta sump unit
  5. Installation of 100mm deep concrete slab, cast to a tolerance of + or – 5mm, to the existing floor, and form 100mm wide by 50mm indent for Delta floor channel
  6. Provision and installation of Delta MS500 membrane to the walls to full ceiling height
  7. Provision and installation of Delta drainage channels into indent formed by new floor slab
  8. Provision and installation of Delta V3 dual sump unit with high level alarm and control panel into pit formed within the floor slab
  9. Application of Polysil TG500 sealer to the surface of the floor
  10. Provision and installation of Delta MS20 floor membrane and link to wall membrane
  11. Provision and installation of softwood treated battens over the Delta MS500 wall membrane secured to Delta plugs
  12. Provision and installation of plasterboard over the soft wood battens to form dry lining
  13. Provision and installation of plasterboard to ceiling
  14. Plasterboard finished with set coat plaster finish
  15. Provision and installation of 100mmx19mm bullnose skirting
  16. All debris removed and space left clean for clients decorative finishes.

What our client says:Property Conservation Services Ltd did an excellent job on our basement conversion. The work included laying a new concrete foundation, building a lightwell, installing waterproof membrane and plastering. Their communication was great throughout the project, keeping me well informed at every stage. The entire team was professional, committed, and clearly took pride in their work. The end result is outstanding, delivered on budget and to a high standard. Their work has transformed the space from a dark and damp space to be avoided, to an amazing extra bedroom. I highly recommend them.

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Property Conservation Services Treatments