Sika-Trocal®’s high-performance waterproofing roof system has been installed at the Nash Mills Wharf residential complex in Hemel Hempstead.

The development comprises of six buildings containing one-to-two bedroom, energy-efficient apartments and penthouses.

To ensure clients Crest Nicholson were able to market the development at the earliest opportunity, the main contractors and architects required a “fast programme” of works.

To facilitate time-effective construction without compromising on quality, an easy-to-install, proven watertight roofing system was required. Roofing sub-contractors Seeco selected Sika-Trocal® Type S. Ideal for mechanically fastened roofs in new build and refurbishment applications

The Sika-Trocal® system does not require a separate fastening system for the thermal insulation as the disc system utilises the same disc and fastener for securing the insulation and the waterproofing membrane, thus improving speed of install.

After installation, the product requires no further surface treatments or maintenance throughout its service life. The high elasticity of Sika-Trocal® S allows it to absorb all movements that occur on a roof without failing, and to reduce stress on fasteners from the dynamic forces of wind loads.

To provide stronger support in areas such as roof balconies and terracing where foot traffic was potentially high, a sheet of waterproof Sika-Trocal® SGmA was installed, followed by a layer of Sika-Trocal® S-Felt Type T polyester fleece for additional protection.

As well as offering quality, long-term protection against physical stresses, SGmA - if covered with a minimum 50 mm depth of gravel ballast – is deemed to achieve an FAA fire rating. Fully-installed, the system also offers a higher degree of sound reduction, therefore enhancing occupants’ domestic well-being.