BASF has received Deutsche Institut für Bautechnik’s approval for the use of its Styrodur 3035 CS, 4000 CS and 5000 CS insulation material in double-layer installation for inverted roofs. Styrodur C is a water-repellent, rot-proof and pressure-resistant insulation material that can prolong the existence of homes and buildings.
Double-layer installation of Styrodur C in inverted roofs
The inverted roof, which is a type of flat-roof construction, has several advantages. The waterproofing layer lies below the insulation material, which leads to a layered structure that can provide long-term structural protection and energy-efficient thermal insulation. Styrodur C material has foam skin on both of its sides and a closed-cell foam structure, which prevent absorption of water. It has been approved for applications in inverted roofs since 1978, but only for single-layer installations.
BASF has proved the feasibility of Styrodur C double-layer installations in inverted roof from the point of view of construction physics. The material can also meet stringent insulation requirements. In double-layer installations, the insulation panels have to be enclosed with a permeable separating and water-repellent layer, so that the rainwater permanently runs off the surface. Existing inverted roofs that have a single-layer of insulation can be upgraded by adding a separating layer and a second Styrodur C insulating layer.
The insulating layer protects the waterproofing against mechanical and thermal stress and prolongs the life of the inverted roof. This would also help comply with modern insulation and energy consumption standards.
Source: http://www.basf.com/