Triton approved contractor, ISCA Preservation, has installed waterproofing systems from Triton to protect a historical stone building on the seafront at Porthcressa on the Isles of Scilly. The 150 year old granite and lime mortar building is being converted to a public library as part of the Porthcressa Regeneration Scheme.
Triton approved contractors were asked to recommend a method of protecting the new dry lined interior from the invasion of sea salts, rising damp and lateral penetration from high external ground levels. The building’s heavy salt contamination and risk of Radon gas ingress also had to be taken into account as well as shipping costs to the remote island.
Working in conjunction with Triton, ISCA proposed using a combination of BS 8201 Type A and Type C waterproofing systems. The solution comprised Platon cavity drain membranes sealed with butyl rubber products and a liquid applied membrane that together provided a fully sealed system to the building and required minimal preparation or disturbance to the original substrate.
Platon P5 cavity drain membrane was installed to the full height of the walls, and linked to the internal drainage channels. Cavity drain membranes work by allowing moisture to continue to penetrate the substrate but then control it in the air gap formed by their studded profile and direct it down to perimeter drainage channels.
The floor area was protected by Platon Multi membrane, a deeper studded, BBA certified product which is impermeable to water, gas and water vapour. Platon Stop membrane was then laid over the insulation layer and sealed to the wall membranes with Triton’s Corner Strip, providing a completely sealed system behind the insulated dry lining.
In the entrance foyer the new slab was sealed with Triton’s liquid applied water and gas barrier, TT Vapour Membrane, a BS8102 Type A waterproofing system that will form a traditional water and gas proof tanking layer.
