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Detailing
At an early stage in the design process, an audit of roof geometry should be carried out to establish what types of details will be required and whether they are to be weatherproof (incorporating an upstand/cover flashing arrangement) or waterproof (to provide continuous waterproofing across the detail).
Wherever possible, thermal performance should be maintained across a detail to avoid creation of a cold bridge. Restraint against wind load and design fire resistance must also be maintained across details.
The total roof zone depth should be assessed at critical points, such as the top of drainage slopes, to ensure there is enough free upstand available to create the minimum required 150mm of waterproofing protection above finished roof level. It is important that this minimum 150mm upstand is maintained at all points around the waterproofed area, including patios, terraces, balconies etc.
In situations where uninterrupted access/egress (disabled/fire) is required, this is best achieved by use of localised ramps, preferably with some form of open grating at the abutment to the elevation to ensure effective weatherproofing.
Where a surface finish, ballast, paving slabs, or decking is applied to the roof, this minimum height is to be measured from the finished roof surface, not from the waterproof membrane. This applies to both warm and inverted roof construction.
Please click here for more information on the following:
- Abutment to masonry
- Eaves and verges
- Gutters
- Load bearing plinths
- Movement joints
- Pipe penetration
- Rainwater outlets
- Upstands
© 2006 Sarnafil Ltd. Legal Disclaimer
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