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Thermal Insulation Products
For application in warm roof and inverted warm roof systems, thermal insulation is manufactured and supplied as a rigid board, because it must be capable of withstanding loads during construction and service.
Boards typically range in size from 600 x 1200mm to 1200 x 2400mm.
Thermal insulation products for single ply roofing are classified generally in terms of their behaviour, as follows:
- Cellular materials, which derive their performance from the thermal resistance of gas(es) trapped in the cell structure and from the thermal resistance of the cell walls.
- Fibrous materials, which derive their performance from air trapped between fibres laid perpendicular to the direction of heat flow.
Composite products for warm and inverted roof applications comprise a baseboard with an overlay factory-bonded to it. Composites combine the thermal performance advantages of cellular or fibrous insulants, with the load-resistant and/or fire-resistant properties of the dense overlay. Some composite products are available, which combine a plywood overlay with a cellular insulation and metal foil vapour control layer bonded to the underside. These composites combine deck, thermal insulation and vapour control layer in a single product, but are suitable only for certain applications. They must be carefully sealed at joints, to prevent loss of vapour control performance.
Insulating screeds on concrete decks can also contribute to overall thermal resistance. However, their contribution is limited unless impractical thickness of screed is proposed. In addition, the effect of a further wet process on construction time has reduced its popularity.
For application in cold deck roofs, thermal insulation is generally either low-density mineral wool quilt or cellular material, because it does not have to withstand loads.
© 2006 Sarnafil Ltd. Legal Disclaimer
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