Composite System Installation
Composite systems are normally laid layer by layer to form the desired system. Typically, they comprise a metal base layer to provide support for the insulation, which is overlaid by a vapour check layer, insulation, underlay, and the top roofing sheet.
Post and rail systems are often used for overlaying existing roofs in good, safe condition. Another form of overlay uses custom-cut blocks as pan infills, over which is laid a continuous insulating layer. These forms of roof repair avoid the need for removal and replacement of an existing roof, allowing the building tenants’ operations to continue uninterrupted.
When installing composite systems, it is important that the vapour control layer is correctly installed and sealed to the manufacturer's requirements, and insulation is laid correctly without gaps. Bulk insulation must be able to loft up to its design thickness to achieve the design R-value.
These systems have a heavy reliance on accurate installation for them to meet their design expectations.
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