Mechanically fastened systems are suitable for both new and refurbishment projects of any size. Sika-Trocal Type S membrane is mechanically fastened using the Sika-Trocal disc, a system that fastens both the insulation and the membrane, thus reducing the fasteners required for a project by 40-60% compared with other systems.
A ballasted (gravel/paved) roof will generally require a stronger supporting structure than that for the exposed membrane one, but will allow the roof to be used as a trafficked or leisure use area.
Additionally a ballasted roof will provide a higher degree of sound reduction and, if covered with minimum 50 mm depth of gravel ballast or 50 mm thick pavers, is deemed to achieve an FAA fire rating.
Sika-Trocal Type S-Vap 500E Vapour Control Layer provides an effective solution for applications below humidity class 4. Where a higher performance is required, such as swimming pools and green roofs, suitable solutions should be sourced from 3rd party suppliers. Where a bitumen based solution is chosen this must not come into contact with the Sika-Trocal membrane.