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Cold Verses Warm Roof Construction |
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Warm roof construction is becoming more fashionable and for good reason. A warm roof construction will give vastly improved efficiency over the traditional cold roof design. At the same time eliminating the risk of condensation by moving the 'dew point' outside the structure. Any initial cost over and above that of a cold roof system is quickly re-couped by reducing heating and cooling costs.
Cold Roof
The makeup of a cold roof is usually a deck supported by rafters and firings on top of which is laid the waterproof membrane therefore the only place to put any insulation is between the joists this method can be prone to condensation, therefore ventilation is required to allow any moisture to escape, this in turn results in heat loss reducing the effectiveness of the insulation. This said this method has been around for many years and is sufficient in a lot of cases.
Warm Roof
A warm roof has the insulation on the outside of the structure which means the roof decking is effectively inside and therefore the deck is kept warm (hence the name). Because the deck does not have two opposing temperatures, i.e. cold from outside and warm from inside the chance of condensation or damp is eliminated, Because there is no dew point at decking level this means that ventilation is not required, which in turn means that any pipework, wiring, ducting, etc is not subject to extreme temperature differences or moisture.
Although these pages are checked regularly and every care is taken with the information within. Delston can not accept any responsibility or liability for information or results displayed within due to third party interference. All information was deemed correct at time of publication. Author Myrddin
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