Waterproofing Retaining Basements on a Sloping Site

Summary

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  The garden room on the open elevation of the basement

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  The fully fitted out ‘zen rooms’ provide an idea of the quality of finish being delivered by Rymill Property Developments

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  The rooms on the open elevation have direct garden access

Rymill Property Developments were approached by the owner of an old vineyard in Hampshire, in order to redevelop the site, with Newton providing advice for waterproofing retaining basements on a sloping site for three brand new, modern properties in line with BS 8102:2022.

The Project

As well as building an immaculate four-bedroom, four-bathroom Georgian house for the client, Rymill also took on the task of creating 3 brand new, modern properties. All had basements built into the existing sloping site.

The large, partially retained basement areas would all house a stairwell, plant room, storage room, cinema room, zen room, two ensuite double bedrooms and a garden room. Therefore, they required a completely dry internal environment.

The Solution

To effectively deliver a series of completely dry basements, they required a combination of Type A and Type C waterproofing systems.

After first applying a tack coat of HydroCoat 908-LB to assist with bonding, Rymill installed HydroCoat 103 2K. The high-performance, cementitious Type A barrier membrane acted as an internal surface of the earth retaining walls. “The team also used HydroCoat 203-RM as a smoothing fillet at the new wall–floor junction and applied CDM 906 Lime Inhibitor to the new concrete slab to prevent the leaching of free lime prior to installing the Type C system.

Lastly, Rymill installed the comprehensive CDM System – the failsafe solution. The maintainable system included the CDM 508 and CDM 520 eco membranes. As well, Newton’s specialist insulation CDM Fibran XPS 500-C, and CDM BaseDrain. This ensures that the system is maintainable in the future.

The Result

The installation of all Newton products by Rymill went smoothly from start to finish. They successfully delivered three completely dry basements that were suitable for their intended use, as per British Standard 8102:2022. As a result, all properties were sold above the asking price immediately after being listed on the market.

"Newton were brilliant, from helping us with product-specific training to working with the project architect on the waterproofing design. It was also overseen by Test Valley Borough Council and LABC Building Warranties, both of whom were happy with the waterproofing. As a result, the installation went seamlessly in each property, despite the challenging site, and we are very proud to have delivered The Vinery to its new owners." Ian Rymill - Company Director, Rymill Property Developments