ALSOP ARCHITECTS: THE PUBLIC SPECIFICATION SHEET
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. Matched the more expensive system's sightlines from beneath ROOFLIGHT: GLAZING 10mm toughened outer (Suncool HP Brilliant 50/25), 16mm cavity, 8.8mm laminated Optilam clear float inner Pilkington Good thermal properties and resilience to dead load to protect against falling bodies CLADDING: ROOF-TOP STRUCTURES 0.5mm Ugibright AME Grade 316 stainless steel Ugine & Alz UK Alucomat composite-aluminium panels, polyester powdercoated black and white.
Complexity of form MAIN CLADDING: INSULATION Trisomet 80mm thick PIR composite steel cladding panel Corus Panels and Profiles Guardian TF Rockwool-cored composite panel or similar.
Panels had to span 8.8m, good environmental credentials of PIR insulant (HCFC free with LPCB and FM approval) MAIN CLADDING: CARRIER PMF D100 0.9mm aluminium structural decking sheets Corus Panels and Profiles Cold rolled Z-sections at close centres Additional strength given to the cantilever by the linked decking panels compensated for the complete coverage MAIN CLADDING GA-1825 0.9mm aluminium sinusoidal cladding with three-coat Pvf2 duotone colour finish Profile by Gasell Colour coating by Euramax Various aluminium or steel rolled profiles by other manufacturers Gasell through Euramax offered bespoke colour service that allowed creation of the subtle effect required MAIN CLADDING: (Internal) CARRIER Tactray 90 steel liner trays, cut to curve of 'jellybean' windows, with 60mm Rockwool quilt insulation and 30mm semi-rigid insulation with G.O. Textile Terran Advantage black tissue facing Haironville TAC Cold rolled Z sections at close centres Liner trays were ideal to carry the quilt insulation to meet acoustic and thermal insulation requirements MAIN CLADDING (Internal) 0.7mm perforated steel sinusoidal profiled cladding Corus Panels and Profiles Various aluminium or steel rolled profiles by other manufacturers Perforation configuration supplied in the required thickness and colour. British Board of AgrÞment certificate MAIN CLADDING (External curved window reveal) 2mm aluminium curved and welded box reveal, finished in Alesta AP system pink PPC RAL 4010 Fabricator:
CA Group Finish: Dupont GRP-moulded curved reveals with pink gel-coat finish Cost, flexibility, 25-year guarantee MAIN CLADDING (Internal curved window reveal) 18mm curved ply backing with 8mm flexi-MDF Richardson Roofing GRP-moulded curved reveals with pink painted finish Able to match inner and outer reveal, flexibility CURTAIN WALLING TO GLASS SKIRTATGROUND Sch³co FW50 SSG Sch³co Fully frameless structurally glazed systems Cost and large unit size led to introduction of a stick system behind the glass