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Multi-layer systems

QS Report: Independent research of the cost comparison of single-layer versus multi-layer tapered insulation

These incorporate a series of tapered components which are laid over flat 'packer' boards and bonded together on site. The area which needs to be bonded can therefore be up to three times as much as the actual roof area and in addition to increasing the cost and time involved, this also greatly increases the margin for error.

Single-layer systems

Here the components are carefully bonded together under factory controlled conditions. They simply require installation and bonding to the roof deck.

Gradient single-layer systems therefore:

• - Allow easier and faster set-out on the roof
• - Ensure more effective and reliable adhesive bonding
• - Reduce installation times
• - Cut labour requirements and adhesive costs
• - Provide greater control over board tolerances

*Some mechanically-fixed schemes can be cost-effective when used with multi-layer insulation, provided no adhesive is required and the boards are fixed directly to the roof deck.