View source for Roofs - Insulation Overlays

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Insulation overlays are used to separate the roof membrane from the primary insulation, usually for one of two reasons:

* to prevent the insulation from affecting the performance of the roof membrane
* to prevent the roof membrane and / or the method of application from affecting the insulation

The insulation can affect the performance of the roof membrane in the following ways:
* the insulation may be incompatible with the membrane, resulting in a loss of physical properties
* different coefficients of thermal expansion may result in membrane splits / cracks.

The roof membrane and / or the method of application can affect the insulation in the following ways:
* the insulation may not be capable of withstanding asphalt application temperatures and may &#8220;burn-out&#8221;
* some insulations will not accommodate direct torch-applied membranes
* insulations that are too &#8220;soft&#8221; may result in delamination or damage to the membrane or insulation when exposed to heavy loads or traffic
* the solvents and adhesives used for flexible membranes may adversely affect the insulation.


<big><big>[[Insulation Joints and Overlay|Fibreboard]]</big></big>
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<big><big>[[Insulation Joints and Overlay|Asphaltic Overlay Boards]]</big></big>
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<big><big>[[Insulation Joints and Overlay|Composite Overlay Boards]]</big></big>
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