en.Wedoany.com Reported - UK Delta registered installer Prism Construction has successfully transformed a dilapidated former pub into two modern residential homes, despite initial concerns from the structural engineer that two of them might collapse. The project's goal was to completely convert an abandoned, damp building into modern, dry living spaces.

The building's original solid brick structure was in good condition, but the layout was complex, with varying ground levels along the front and side elevations, and it was situated immediately adjacent to a road. The renovation plan included raising the ground floor to increase headroom, replacing timber floors affected by wet rot, and addressing a solid concrete slab floor in Unit Two that was slightly below the ground plane of the front elevation.

The Delta technical team collaborated with the structural engineer and developer to tailor a waterproofing system design in accordance with BS 8102:2022. The residential areas required a Grade 3 fully dry standard. The team selected a "Type C" waterproofing system as a maintainable waterproofing solution for the existing basement, and adopted a combined Type A and Type C protection approach to reduce the risk of common mode failure.

For the Type A waterproofing system, the Delta technical team applied two coats of Koster NB1 to the front brick wall and basement slab surfaces prior to installing the Type C cavity drainage protection system. Substrate preparation included fillet detailing internal 90-degree angles with Koster Repair Mortar Plus, filling voids, and repointing loose masonry. All new concrete was sprayed with Koster Polysil TG 500 to prevent free lime build-up, thereby avoiding blockages in the Type C drainage system.

For the Type C cavity drainage protection waterproofing system, the team installed Delta MS 500 membrane on the walls and laid Delta MS 20 on the floor, connecting it to the wall membrane. Delta FM was deployed on the ground floor concrete slab to prevent lateral capillary moisture. Delta drainage channels were inserted alongside all retaining walls and connected to non-return valves, utilising the site topography for gravity drainage. The original solid staircase was retained and prepared before the application of Koster NB1.

Upon completion of the renovation, the client acknowledged Delta's technical approach to the waterproofing system, considering its structural waterproofing solution to be both technically sound and design-driven.

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