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PRODUCT AND WHERE USED MANUFACTURER ALTERNATIVES CONSIDERED REASONS FOR FINAL CHOICE ROOFING G410-15-ELF PVC membrane Sarnafil Speed of installation, fire performance, manufacturer-trained installers, durability ROOFLIGHT: FRAMING Thermgard patent glazing system finished in PPC Ral 9006 silver Lonsdale Metal Company Structural silicone-glazed thermally broken aluminium rooflight system to match vertical glazing to external walls A cost-effective alternative in a less visible location. ...

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