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Gemini is a low cost option that is equal to all other built up systems. The changes to standard Twin-Therm® system are as follows:
- An industry standard liner panel ridge flashing is offered rather than the crank which on the face of it saves money on material. The contractor needs to be aware that this option requires fillers and lots of sealant and the detail does not perform in terms of air tightness as well as the T-crank ridge.
- The spacer arrangement does not include Therma-block. We have developed a plastic spacer which is conical. 45mm diameter at the base, 35mm diameter at the top. At the top of the block the hole is feathered to allow the roofing contractors to pre-assemble the bar to the plastic spacer. The feathers prevent the screws falling out whilst being transported on to the roof or along the roof, similar to the existing T-block. Common to all other spacer systems there is a cold bridge resulting from the head of the fastener being in contact with the spacer and then being driven into the purlin, unlike T-block which isolates the T-bar from the fastener, eliminating the cold bridge.
- The insulation is standard cladding roll, 1200 mm not 1030mm wide and has no slits in its length and silicone on the top and bottom of the roll. Therma-quilt on the other hand has silicone on every fibre and is slit appropriately to allow the insulation to be installed continuously, thus ensuring there are no gaps on the roof at all.
- Rooflights are sourced directly by the roofing contractor. Therma-lights are made specifically for CA’s Twin-Therm® system, as Twin-Therm® is a dedicated system always using the same components and tested to an extreme test procedure, a Class B Non-Fragility (to ACR[M]001:2005) is offered using 6oz (or 1.83kg/m²) over 8oz (or 2.44kg/m²) GRP in the construction. The National Association of Rooflight Manufacturers (NARM) insists that if Non-Fragility is being given by them, then the rooflight has to be 8oz over 8oz (or 2.44kg/m²) GRP.
- The guarantee offered by CA Group for the Gemini built up system is 12 years maximum. It is anticipated that when this system is selected, it is done so on price and we believe that the Corus Colorcoat® LG range will be selected. The guarantee is given to the customer, not the client which is different to the guarantee with Colorcoat HPS200® Ultra which is given direct to the client.
- Unfortunatly Corus Confidex Sustain® cannot be offered with Gemini.
Click on the image of the Gemini spacer to enlarge.