Delta Membranes Ltd registered installers Timberwise (UK) Limited have offered a waterproofing design to meet the requirements of BS 8102:2009 for Wildernesse House, a Grade II listed Georgian House in Kent.

The aim was to achieve a dry habitable living space, defined as a grade 3 environment.

BS8102:2009 is the British Standard that gives guidance on dealing with ground water assessment, drainage and associated risk assessments and buildings partly, and fully, below ground as well as both deep and shallow basements.

Delta’s Type C Drained System was the ideal solution with its sympathetic reversible ‘air gap’ technology, suitable for Grade 1 & 2 heritage structures as the system is reversible.

System components included:
1.Koster Polysil TG 500
2. Koster NB 1 Grey
3. MS 500
4. MS 20
5. Delta Channel

Due to Wildernesse House being Grade II listed a waterproofing system that was suitable for heritage structures was required.

Over time the decay within Wildernesse House’s basement had allowed undesirable water ingress. All large holes found in the brickwork were sealed in preparation for the waterproofing system.

Prior to the installation of the Type C system, an application of Koster Polysil TG 500 was applied. Koster Polysil TG 500 is an anti-lime inhibiter which reduces the amount of free lime leaching into the Cavity Drainage System.

Following the curing of the Koster Polysil TG 500, 2 coats of Koster NB1 was applied. Koster NB1 is a mineral coated waterproofing slurry which is ideal for sealing brickwork against pressurized water ingress.

The Delta MS Cavity Drain System was installed to the walls and vaulted ceiling with perimeter drainage set into the basement slab.

Inspection ports were added at approximately 8 linear meter intervals to ensure that the drainage aspects would be fully maintainable and in accordance with BS 8102:2009.

Any large holes found in the pointing in a different area of the basement were sealed in preparation for the waterproofing system.

The substrates were then treated with Koster Polysil TG 500 anti-lime inhibitor, which also improves the water resistance of the basement structure by absorbing into the structure and locking in the free lime.

Two coats of Koster NB1 Grey were applied. Koster NB1 is suitable for waterproofing against ground moisture and for non-pressurized and pressurized water up to > 13 bar.