The following installation procedure is suitable for all the RubberShield flat roof systems, with exception of the fully bonded method where the geotextile underlay is not used, this is because the membrane is adhered directly to the substrate (decking) The fully bonded system can be used on a pitched roof up to the vertical.
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Procedure (1)
The roof is inspected and if the decking is found to be damaged or rotten it should be ideally be replaced by 19mm exterior marine ply or OSB. If the decking is OK, it should be swept of all debris and be dry, comparatively clean, and making sure there are no raised nails, sharp edges or large gaps in the timberwork. |
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Procedure (2)
The geotextile underlay is rolled out and fitted to the flat area of the roof by means of a staple gun or tacking at intervals of a metre or so, to form a barrier between the substrate and the membrane to form a solid insulation. (not in the case of a full bond) |
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Procedure (3)
If the flat roof has a pitch which is designed to take the water into the gutter, a gutter apron should be fitted about 30 cm from gutter edge laying into the bottom of the guttering, again using a staple gun, tacks or substrate adhesive, whichever you prefer. |
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Procedure (4)
An internal drip edge is now prepared by stapling (or using tacks) the rubber sheet to appropriate sized batten to the complete length of the gutter edge, which is fastened to the outside edge of the rubber membrane sheet. |
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Procedure (5)
Carefully hang the rest of the rubber membrane down the gutter edge wall leaving the batten on the roof and then fix the batten level with the roof making sure not to make an upstand edge using either nails or screws, whichever you your preferance. A gutter apron can be used as a simpler alternative method where suitable. |
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Procedure (6)
Once the wooden batten is positioned correctly, pull the whole sheet back over onto itself and pull over onto the roof to make an impervious internal mounting. |
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Procedure (7)
If the roof is joined to upstand like a wall, this can be bonded using the substrate adhesive to the flat area of the roof, up the wall to about two courses of bricks and then chasing into the wall to a depth of approximately 30 mm and sealing with standard silicone sealing compound. |
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Procedure (8)
If the flat roof is joined onto a pitched roof, first remove one or two tiers of tiles, adhere the membrane with substrate adhesive to the roof tile underlay at minimum of length of 30 cm, then replace the tiles. |
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Procedure (9)
Most flat roofs will have an upstand edge on all sides except the gutter edge. If you have decided to leave the older roofing material like felt intact and just lay the underlay and EPDM over, the old felt must be removed where it hangs over the side facia board. The rubber membrane is then adhered over the upstand and down onto the facia board to a minimum length of 50 mm. the edge is then finished of with edge trims. You may wish to fit some other kind of trims like soffits, it is purelya cosmetic feature. |
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Procedure (10)
For the mechanically attached or fully bonded systems, the roof is now complete, but if you have chosen the ballasted method the installation is completed by the application of ballast to the roof, 20mm river washed pebbles are ideal. If you have decided to seal the roof to install a patio, use flags ensuring a weight of 50kg per sq/m. When using the ballasted system or sealing a roof for a patio, always consider the load and if the roof needs to be strengthened. |
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