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Wind-tightness is essential in order to prevent unnecessary cooling down of the insulation layer resulting in a reduction in effective U-value of the construction. Water-tightness is essential in order to prevent rain or condensation from entering into the insulation layer resulting in a reduction in effective U-value of the construction. Water vapour permeability is essential in order to prevent the build-up of interstitial condensation within ‘warm constructions’. i.e. constructions in which the insulation is kept ‘warm’ by a membrane. |
| Date published | Title | File size | Document type | ||
| 17/05/2006 |
|
222 KB | Product sheet |
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