Sika’s rapid-apply waterproof solution guarantees long-term roof protection for city development

Sika-Trocal supplied the easy-apply watertight solution for a multiple-roof application that involved the installation of a communal roof garden.

Altius is a five-story residential block in Latham’s Yard, Hackney, East London. In order for internal works to take place within the new-build property without interruption from the elements, developer Taylor Wimpey required a roof system that offered rapid installation, optimum waterproof properties and was capable of facilitating a communal garden area. Thanks to its range of available waterproofing solutions, Sika-Trocal is said to have comfortably met each requirement.

Roof installation at the Altius development began in February 2017. Carried out by Contractors T & T Roofing, a specialist flat roofing contractor within the UK, the project involved the waterproofing of three staircase roofs at the building’s highest level as well as the provision of a watertight system for a communal garden located on the floor below.

For the staircase roofs, Sika-Trocal Type S 2mm was installed to a layer of tapered insulation. Suitable for mechanically-fastened roofs in both new-build and refurbishment applications, Sika-Trocal Type S is said to be regarded as the most rapid and economic system to install. The 2mm-thick slate grey membrane was installed across a 400m2 area of the upper roof.

The unreinforced nature of Type S membrane is said to offer exceptional malleability and allow high quality detailing works – the Altius development included a large swathe of PV solar panelling – to be completed to an exceptional standard.

For the 360m2 lower roof, which incorporated a communal terrace garden featuring soil-filled timber sleepers, planting and artificial grass, Sika-Trocal SGmA ballasted roof system was installed with SVB protection.Comprising ballast surface protection, a multi-layer, synthetic roof waterproofing covering, PIR tapered insulation and an s-vap 500e vapour control layer, the system – which was finished with paving slabs set on adjustable pedestals for the Altius project – creates a strong supporting structure that allows a roof to be used as a trafficked area for terrace gardens, balconies, communal spaces and the like.

Thomas Peebles, director at T & T Roofing, said: “Sika-Trocal’s Type S system was selected for this project because of the simplicity of installation. We needed a trusted quality waterproof system that ensured the building was weathertight in as short a period of time as possible – the Type S system provided exactly that. It’s a quick, fast-moving system that was absolutely perfect for this project.”