Design and build condensation-free roofs
Warm air transports moisture in the form of water vapour, and any cold surfaces within a building have the potential to reach dew point when that warm air comes into contact with them. Moisture ingress into the roof space can occur in many ways. Condensation may also occur in new buildings when moisture levels peak after completion of wet work and the construction undergoes a period of ‘drying out.’
Roof ventilation
Roof ventilation construction is often regarded as “the traditional way” of meeting the regulations. However, from an energy conservation perspective, introducing cold external air into roofs can be to the detriment of the construction by:
- Reducing the effectiveness of the insulation
- Promoting warm air leakage from the building into the roof space
- Increasing air infiltration into the heated building
- Introducing dirt, dust and insects into the roof construction
- Introducing external moisture laden air into the construction
Build airtight, watertight and with thermal efficiency
| DuPont advises, the simple but careful application of Air & Vapour Control Layer (such as DuPont™ AirGuard® Control) in the ceiling together with an advanced breather membrane in the roof (such as DuPont™ Tyvek®) with the use of Tyvek® special tapes and sealant). This optimised combination, if properly understood and installed, addresses not only the condensation but also significantly enhances the overall airtightness, thermal efficiency, integrity and interior comfort of the structure. |
How to combat air leakage
Tyvek® proven durability
How Tyvek® can contribute to greater energy efficiency
