Axter EXCEL®/SPOT system
Axter EXCEL®/SPOT system |
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Concrete deck
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Click here for a detailed view of the system
Listed below is a general specification using an auto-adhesive base layer (Axter can provide written detailed specifications to suit any building on demand).
| Usage | Products |
| Deck | Concrete, laid to achieve a smooth deck finish and laid to the correct falls. If overlaid with a screed this should be of lightweight aggregate and no fines concrete. An alternative is to lay the concrete flat and achieve falls with tapered insulation. |
| Primer | Prime deck/screed with Axter's VERNIS ANTAC (see brochure) quick drying primer and allow to dry. |
| Vapour control layer | High humidity building - Fully bond to the concrete deck Axter's VAP AL aluminium cored SBS modified bitumen vapour control layer. Low humidity building - Fully bond to the concrete deck Axter's HYRANGER SPOT S3 V, an SBS modified bitumen auto-adhesive vapour control layer. |
| Thermal insulation | Fully adhere Axter's HYTHERM ADH CFC-free surfaced insulation. Thickness will be determined by 'U'-value requirements. Axter can advise on required thickness and means of adhesion. |
| Under layer | Fully bond to the insulation Axter's HYRANGER SPOT S3 V, an SBS modified bitumen auto-adhesive base layer. Care must be taken to ensure sealing of side and end laps by torching the top surface. |
| Top layer | Fully bond by torching to the surface of the under layer Axter's EXCEL HR S, Alpa-mix modified bitumen membrane, colour to choice. Side and end laps to be carefully torch bonded with a 2mm bitumen visible bead. |
| Details | At the base of all upstands a reinforcement layer of Axter's HYRANGER 35 PY angle strip 250mm girth should be installed centrally in the angle and bonded to both flat and vertical surface. The top layer should then be taken up the upstand. |
| Rainwater outlets, etc. | Flanges of rainwater outlets should be encapsulated between the under layer and the top layer. |
In general specifications should follow the guidelines given in:
British Standard Code of Practice BS 6229:2003, Flat roofs with continuously supported coverings.
British Standard Code of Practice BS 8217:2004, Flexible bitumen sheet roofing.
Specifications are given for roof slopes< 5°. Apply to Axter for further information.
Axter advises that an AXTERSHIELD INSTALLER, who has specialist knowledge of Axter's systems, installs the specification given above and from whom extended guarantees can be obtained.
Specifications listed are for guidance only and Axter cannot be held responsible for any errors or omissions. It is the specifier's responsibility to ensure that the specifications are suitable for the requirements of his construction.
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