A 2,800 m² commercial roof terrace fully specified with AliDeck's fire-rated system — from structural deck boards to drainage, rail and balustrade. Delivered in six weeks. Zero defects on handover.
India House, the 1930 Grade II* listed building on Aldwych, presented a rare and complex brief: transform 2,800 m² of redundant flat roofing into a usable commercial roof terrace without compromising the building's structural integrity or its Grade II* status.
The architect specified a full AliDeck system for the deck — requiring fire-rated, non-combustible boarding that could be laid at the low falls mandated by the drainage design. AliDeck Junior Plus boards, specified across the whole deck area, gave the design team a product with documented BBA certification, full NBS clause support, and a span capacity that eliminated the need for additional sub-structure.
The AliDrain deck-level piped system was integrated to manage the significant water volumes expected on a roof deck of this scale. Integrated linear channels and a fully documented drainage calculation were provided as part of the Right Spec Guarantee™, removing risk from the drainage design entirely.
AliRail glass balustrade panels completed the specification — providing compliant guarding without interrupting views across central London. The full system was co-ordinated by AliDeck's technical team across a six-week programme.
"We chose AliDeck because the fire-rated spec was off-the-shelf — we didn't have to negotiate."
55mm aluminium deck board. BBA certified. Used across the full 2,800 m² deck area at 400mm joist centres. Non-combustible A1 rated.
Integrated linear drainage system. Channels concealed within deck build-up. Full drainage calculation included. Designed for high-volume roof deck applications.
Aluminium post and capping system with toughened glass infill panels. Specified for perimeter guarding across the full roof terrace. Preserves views across Aldwych.
AliDeck's technical team conducted a site visit to India House during RIBA Stage 3. Structural loading, drainage falls, and parapet heights were recorded. The full specification was drafted before any products were ordered.
A complete specification package was issued within five working days: NBS clauses for all three products, CAD drawings for drainage and rail, loading calculations, and a programme schedule. The architect inserted directly into the Stage 4 package.
Materials were delivered in three phased drops to avoid overloading the roof structure. AliDeck's technical support team attended during the first fix week and signed off the completed installation. Handover pack issued on day of practical completion.
Talk to our technical team about your project. NBS clauses, CAD, drainage calculations and installation support — all included.
