PRODUCT AND WHERE USED MANUFACTURER ALTERNATIVES CONSIDERED REASONS FOR FINAL CHOICE EXISTING SOFFITS/COLUMNS Grit-blasted concrete with clear sealant Main contractor Plastered and decorated Honest expression of the building's structure.
Strong tonal and textural contrast to refined finishes of new elements
PARTITIONS/LININGS/CEILINGS Gyproc Gypwall, GypLyner and CasoLineMF with plaster skim coat British Gypsum None Visually simple, economic and fire/acoustic separation capabilities
EXTERNAL GLAZED SCREENS Purpose-made frameless clear toughened glass double-glazed units with concealed stainless-steel fixing channels Masterglazing None Strong visual impact. Maximum light transmittance to internal spaces to lower ground floor
DOORS Purpose-made panelled timber door leaf and frame to exterior. Purpose-made flush timber doors and frames internally. All doors and frames decorated on site 3D Joinery Workshop-applied spraylacquered finish to door leafs Visually simple, durable and economic.
Ironmongery can be fitted on site.
Prefinishing of door leaves was rejected on cost grounds and programme implications
WALL CLADDING TO WCs Corrugated galvanised steel to ground floor.
Shuttering-grade plywood with coarse sanded finish and clear sealant to lower ground floor Main contractor Ceramic or mosaic tiling Hygienic, durable, economical and low maintenance
MAIN STAIR In situ concrete with timber treads and fairfaced concrete risers. Stainless-steel angle nosing to treads Main contractor Prefabricated steel stair or precast concrete structure Robust, acoustically dead and economic.
Prefabricating the stair structure off site rejected on cost grounds and due to health and safety issues
BALUSTRADING TO STAIR VOID Purpose-made cantilevered clear laminated and toughened glass panels with concealed mild steel fixing angles to stair. Translucent toughened glass panels with concealed mildsteel fixing angles to ramp Masterglazing Prefabricated steel balustrading Maximum light transmittance and views to internal spaces to both floor levels Glass types and thickness allow stair panel to be formed from a 4.2m-long single sheet.
Width of panels to ramp limited by aspect ratio recommended for toughened glass
FLOOR FINISH TO GROUND FLOOR Salvaged and second-hand hardwood parquet flooring with clear sealant Main contractor Purpose-made birch plywood panels on a triangular grid Visual warmth and durability of timber.
Triangular birch plywood panels were initially preferred but rejected on cost grounds and contractor's concerns over the accuracy of panel sizes achievable for triangular grid.
Existing hardwood parquet blocks in the space were lifted, sanded and relaid to half of the floor and second-hand parquet blocks sourced for the remainder of the floor
FLOOR FINISH TO LOWER GROUND FLOOR Altro Tect high-build twin-pack epoxy resin floor coating with gloss finish on new proprietary cementitious levelling screed.
Altro Rubber or linoleum.
Other resin flooring manufacturers Seamless appearance with light reflective properties. Altro chosen for its ability to produce the colour required and tailor the thickness of the resin from 3mm to 500 microns