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Methods of Attachment
The means of attaching the waterproof membrane and thermal insulation to the substrate must be selected only after calculation of wind uplift forces, as recommended in British Standard 6399: Part 2 1997.
If using this documentation for projects outside the United Kingdom, National Codes of Practice must be taken into consideration.
The three principal options for attachment of single ply membranes are:
In warm roofs, the thermal insulation may be attached by the same or by a different method from the waterproof membrane. Insulation for inverted warm roofs is restrained by the ballast overlay.
Selection of the appropriate method should be on the basis of the following criteria:
- Calculated wind load
- The suitability of the deck to receive mechanical fasteners
- The internal relative humidity
- The extent and complexity of roof detailing
- Aesthetic considerations
- (refurbishment) The condition of the existing system
When the roof membrane has been installed, it is important to seal the laps as quickly as possible. There are rarely situations where delay is advantageous. Close adherence to the specification is critical, particularly in the case of mechanically/partially attached systems, where precise calculations will have been carried out to ensure the system is secured against wind uplift.
© 2006 Sarnafil Ltd. Legal Disclaimer
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