Delta Registered Installers, Renderseal Ltd were employed to provide a maintainable waterproofing solution to a lightwell which was experiencing water penetration and salt contamination. As part of the solution, the existing garden patio could not be disturbed, or any additional pressure added to the interior of the property.
The basement lightwell walls were earth retaining and subject to lateral penetration from groundwater depending on weather conditions and water table levels. The existing render finish was very sandy in colour and failed to form a barrier to hold back moisture or water.
- Delta PT Membrane
- Delta PT Plugs with Grommets
- Delta Fleece Tape
- Delta PT Profile
After surveying the condition of the lightwell and adjoining property, Renderseal Ltd proposed a solution to modify the lightwell to mitigate any future problems without significantly affecting the structure or surroundings. Delta’s PT membrane offers a fast and effective method for repairing and upgrading lightwells, whilst at the same time retaining the existing aesthetics of properties, making this approach particularly suited to repairs.
Delta’s PT Membrane is a HDPE membrane which works as an impermeable damp proofing base for plaster or shotcrete (as a water control and drainage membrane). Due to the “air gap” technology, Delta PT creates an effective barrier to the transmission of moisture, humidity, water vapour and salts, whilst assisting drainage by directing any water ingress to suitable drainage points.
Once the Delta PT was installed, Renderseal incorporated vertical expansion joints to prevent the render from cracking, whilst installing a horizontal stainless-steel stop bead base. The company further applied a two-coat sand/cement mix to provide a surface ready for painting.
Renderseal Ltd were praised for the quality and speed of its refurbishment and installation work, which was completed in just five days and within budget. The owners of the property were delighted with the result and happy in the knowledge that their lightwell will remain fully protected against the long-term threat of water and salt ingress.