Revision Notes Status Date

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1 45 Folgate Street OUTLINE TECHNICAL SPECIFICATION CONTENTS 1 Location of Tenancies 2 Architectural Outline Specification 3 Architectural Design Criteria 4 Floor to Ceiling Schedule 5 Mechanical Electrical and Public Health 6 Structural Design Revision Notes Status Date 00 First issue for Stage D Update Update MEPH and Structural Update Update TateHindle Limited Page 1

2 1 Location of Tenancies OVERVIEW BY SUITE Roof (6 th ) Plant area (open and closed); Sloped slate roof 5 th Floor Office Suite and Terrace 4 th Floor Office Suite 3 rd Floor Office Suite 2 nd Floor Office Suite 1 st Floor Office Suite Ground Floor Basement Main Reception; Office Suite; External Courtyard and Cycle/Refuse Store Office Suite; Plant and Services; Showers and Lockers; BMS Room TateHindle Limited Page 2

3 2 Architectural Outline Specification The following schedule should be considered as an overview of the scope. This scope specification summarises the design as in the contract set. For associated information refer to the drawings by the design team and the O&M manuals Demolition Elements of the front (south) façade: 1.1. Large glass windows between brickwork pillars and associated framework and bracketry to ground floor removed Rendered wall areas including windows back to brickwork pillars and second floor soffit level at first floor removed Wall and main entrance doors to left hand side of undercroft at ground floor removed. Kerbs and road surfaces to undercroft also removed All windows, spandrels and associated fixings and bracketry removed. Brickwork retained on front elevation At fourth floor level all windows, spandrels and associated fixings and bracketry and brick heads removed, allowing for height of new windows three brick courses higher than existing Roof and mansard section removed including internal structure and dormer windows. Existing beam and RC columns along front elevation retained. Elements to the rear (north) façade: 1.7. Existing core wall and internal structure including concrete lift shaft removed All windows, spandrels and associated fixings and bracketry removed Remove walls from around existing secondary stair then across to existing core. The only wall retained in the scheme is the section of wall above the undercroft drive through to the rear Roof including internal structure removed Railings and emergency staircase from courtyard area removed Plant equipment and television masts etc. from rooftop plant area removed All external plant and associated cabling from area around undercroft removed. Floor Elements All flooring and raised floor systems including adhesive spots for pedestal fixings removed All underfloor cabling and plant services removed. TateHindle Limited Page 3

4 1.16. Ground floor waffle slab pots removed between gridline 1 and 3, between gridline A and B for link stair from basement to ground. Structural strengthening and remedial works as structural engineer s design Lifts and lift machinery removed Core slab and walls removed from gridline C to E between gridline 3 and Secondary staircase, landings and slab removed from gridline D to F. Courtyard Elements Removal of existing backup generator and associated cabling, mountings and timber surround Electrical switch room block, including cabling and foundations removed, Bike stands adjacent to core and also in corner of courtyard removed Carpark surfaces, kerbs and paving, trees plants, shrubs and retaining wall removed. General elements All identified asbestos removed: refer to survey report All plant equipment, duct work and cabling including strays and any support work removed Services: All incoming service heads retained Interior strip out of internal walls and all fixtures Structural Frame 2.1. The retained existing structural frame consists of a reinforced concrete frame with site cast waffle concrete slabs The structural frame for the new extension and the rebuilt core consists of a steel frame with concrete filled metal decking. The foundations for the new structure consist of piles with ground/basement level rafts (piles etc.) 3.0. External Refurbishment Works 3.1. All retained brickwork, flashings and copings cleaned and repointing and making good undertaken General making good after removal of redundant external items All paving within the building s ownership cleaned Proposed External Works Front (south) façade: TateHindle Limited Page 4

5 4.1. New double height dark grey polyester powder coated aluminium curtain walling glazing to ground and first floor including two new entrances, one into the ground floor office space and the other into the main reception. Pressed aluminium surrounds to wrap around openings and give a picture frame effect to the windows New two-step staircase is built in front of the main reception entrance to give access to the raised reception area. A side entrance in the undercroft space to give Part M- compliant level access to the building. A smaller two step staircase built for the office entrance with sealed glazing pavement lights to either side to allow light into the basement pavement void space New windows from second to fifth floor on the front façade; thermally broken double glazed opening units, white-painted internally and dark grey PPC externally New fibre cement slate roof to follow profile of existing roof line. New flashings, copings and lead work to all parapets and abutments New dormer windows and roof lights for fifth floor level Fourth floor level windows remodelled with the head of the window raised three brick courses for similar sized windows as the floors below. Rear (north) façade: 4.7. New extension to rear façade from ground to fifth floor, with a combination of curtain walling, brick areas and timber brise soleil (to first to second floors only) New core element including stair and lift shafts. Clad in brick to match existing and forming same massing as existing building. New windows to staircase with AOV to east elevation for smoke ventilation to the staircase, including rain and heat sensor New fibre cement slate roof to follow profile of existing roof line including new roof lights. Plant room recessed into roof for new plant equipment New windows from 1 st to 4 th floor to retained wall area above undercroft. Courtyard Area New cycle and refuse store made from black stained timber with a timber structural frame and separating blockwork wall between cycle and refuse areas. Cycle racks as a mix of two tier and Sheffield stands New courtyard space with tables and benches and bespoke planting arrangements. Floor finish of light grey fine aggregate resin bound gravel with 50mm bands of black riven slate at 1500mm centres. High quality planters throughout. Undercroft Area Finish to recessed soffits new insulation board with white rendered finish with inset lighting. Cables tidied and rewired for existing and new adjacent equipment. Front Entrance TateHindle Limited Page 5

6 4.14. New signage and door lining detail to define the entrance. Signage in pressed metal reveals with 45FG monogram and 45 FOLGATE backlit signage New bespoke lighting associated with the entrance to highlight the entrance Call button for guests needing assistance, and associated wiring back to riser and to reception desk. Video entry panel for night access to pass door location. Plant Room Level Enclosed plant room accessed via stair from 5 th floor, with open plant adjacent Acoustic louvered lid to open plant between roof ridge and core wall to form a visual screen (or fifth elevation ). This area is insulated and lined with acoustic panels New lighting & escape signage within the plant enclosure. Roof Level Open plant area accessed via companionway ladder from enclosed plant room below. Railing to all sides Lightning protection renewed to roof plant, parapets and copings. Existing downwards conductors retained and testing points identified for continued use. Full testing and validation for handover. Flat roof to extension Three new roof lights to first floor roof area giving light to the ground floor Flat roofs with inverted system with liquid applied system Perimeters of roof with metal capping to match metalwork of the windows Green roofs at 1 st, 3 rd and 5 th floor level with full wildflower and sedum planting and bollard lights Fifth Floor Terrace Terrace at 5 th floor with level access from the office space with black granite paving. Balustrading with black sprayed metal rods and hand rail Proposed Internal Works Reception 5.1. New polished concrete flooring including stainless trim and banding details. Wire-ways formed within floor screed for routing of cables to desk and to set points for small power/data from riser Framed mat well to front door and rear access door with sectional aluminium framed mat inserts for ease of removal for maintenance. TateHindle Limited Page 6

7 5.3. Exposed soffit ceiling. Concrete coffers made good where needed. Linear LED lights fixed to coffer ribs and wired through at ceiling level New reception desk with polished concrete top and pale oak panelled base. Desk to suit 2 occupants, fully freestanding desk with no floor fixings. Under desk with cable management and storage for receptionist s PCs etc. Integrated hard wired heaters. Hearing acoustic loop system integrated into desk Tenant s signboard in adhesive vinyl lettering to form the signage text, black and with font in line with the building branding, situated behind the reception desk within the recessed linear lighting feature Walls in the reception and lift lobby new dry lining and decorations, including the piers between windows. Stainless steel skirtings. Recessed linear lighting feature incorporated into walls behind reception desk and adjacent to lift doors Pale oak panelling to match reception desk to wall behind seating area for aircondition system access 5.8. New statutory signage. Fire signs top lit projecting pictograms to suit location Natural anodised grilles at high levelling in oak panelling for air conditioning supply. Return air via opening in the panelling below bench Recessed fire alarm repeater panel in oak panelled wall with clear window located to reveal display panel information Loose furniture for the reception desk; two black Vitra task chairs Seating area of bespoke polished concrete bench with black leather seat pads and one Vitra Nelson coffee table. Office Space Lower Ground to Fourth Walls in white painted plasterboard, retained walls fully made good to a high quality finish. New steel columns and beams in extension intumescent painted in black Skirtings to columns and walls 100x12mm MDF, white satinwood painted Lift reveals in black satin finish backed glass with a satin stainless steel trims, call buttons and indicators Window cills where required to trim the dry lining, in Satinwood paint finished 25mm MDF, fitted with a 12mm projection Raised Access Floor: Void infills as per the structural engineer s details. Structural slab made good for pedestals, including voids, service penetrations and adhesive residue from previous pedestal installation. Dust sealant to structural slab in two colour coat system to any concrete areas. Raised floor system 100mm overall (floor pan 28mm thick), see levels noted on the ceiling heights schedule. Kingspan Medium density fully metal encapsulated raised floor system. TateHindle Limited Page 7

8 5.18. Ceilings: Exposed soffit ceilings. Existing concrete made good where needed. Ceiling of extension areas sprayed white on metalwork to underside of new slabs. Ductwork, cable trays and fan coil unit casings as MEP specification. PIR and smoke heads as MEP specification. Cabling for these items neatly finished and following lines of waffle slab pinned straight to the slab. Office space lighting as per the MEP specification, all finished to RAL9005: Black semi matt New cleaners sockets presented as floor grommets or single power sockets. Any wall sockets/switches in white Blinds to be by the tenant to the landlord s design guide. Fifth Floor Office Space Walls in white painted plasterboard, retained walls fully made good to a high quality finish Skirtings to columns and walls 100x12mm MDF, white satinwood painted Lift reveals in black satin finish backed glass with a satin stainless steel trims, call buttons and indicators Window cills where required to trim the dry lining, in Satinwood paint finished 25mm MDF, fitted with a 12mm projection Raised Access Floor: Void infills as per the structural engineer s details. Structural slab made good for pedestals, including voids, service penetrations and adhesive residue from previous pedestal installation. Dust sealant to structural slab in two colour coat system to any concrete areas. Raised floor system 255mm overall (floor pan 28mm thick), see levels noted on the ceiling heights schedule. Kingspan medium density fully metal encapsulated raised floor system Ceilings: Exposed roof void plasterboard ceiling. Plasterboard bulkhead to lift lobby with recessed lighting and metal ceiling tiles. Exposed timbers of roof construction with black painted metal brackets and fixings. Ductwork, cable trays and fan coil unit casings as MEP specification. PIR and smoke heads as MEP specification. Office space lighting as per the MEP specification, all finished to RAL9005: Black semi matt New cleaners sockets presented as floor grommets or single power sockets Blinds to be by the tenant to the landlord s design guide. Integrated blinds in the roof lights electrically powered for ease of use Internal Doors Washrooms/Stair Lobbies/Offices/Stair, etc. TateHindle Limited Page 8

9 6.1. Non fire rated & fire rated: Full height solid core doors with fire rated plain glass vision panels (to lobby doors), timber matching solid lippings, matching timber frames, satin lacquer finish. New satin stainless steel ironmongery Riser doors pivot doors with hidden frames and satin stainless steel ironmongery Access control to all doors from stairs to office space WCs & Showers 7.1. Plasterboard and skim coat suspended ceiling system with soft sheen vinyl emulsion paint finish to lobbies Floors in concrete-effect ceramic tiles. Skirtings in stainless steel Walls finished in a combination of white linear tile, black satin finish back painted glass and mirror Back wall to cubicles, bespoke hinged panel for access and tiling to fixed back panel Mirrors over basin area and on back wall, recessed flush with tiled walls Recessed downlight and concealed LED lighting strip in bulkhead 7.7. Wall-hung ceramic WC pan in white, dual/low flush cistern and satin stainless steel flush button. Low water use flush arrangement Accessible WC with disabled person s long cantilever WC and seat ring. Part-M compliant grab bars and seat rests, all satin stainless steel Concrete basin with stainless steel basin mounted mixer tap Satin stainless steel paper towel dispenser and bin (recessed wall mounted). Wallmounted bins and dispensers for the accessible WC in satin stainless steel Fixtures to each cubicle: toilet roll holder, double type, in satin stainless steel; wall mounted toilet brush/holder in black; coat hook in satin stainless steel; door stops Basement Showers and Lockers 8.1. Unisex showers with changing space in each shower room with timber stool and hook Stone shower tray; hooks, seat and other fixtures in each shower in stainless steel Linear wall tiles to full height. Slip-resistant ceramic tiles to floor and matching skirting Part M-compliant shower and WC with Part M-compliant fold down seat and associated shower grab bars Locker room with wall mirrors and lockers. Bespoke lockers provided as 32no. MFC carcasses with black/mixed colours MFC solid laminate doors. Locking arrangement by 4 digit number code locks. All lockers signed with a number label to each. TateHindle Limited Page 9

10 9.0. Internal Signage 9.1. New signage to risers and on service doors on door leaf edge Signage on stairs to indicate floors black acrylic numbers Directional fire pictogram signage, top illuminated acrylic to suit location, small format Passenger Lift Car (Refer to MEP Outline Specification) Two new lifts within new shaft Concrete-effect ceramic tile flooring to match reception with stainless steel trim High quality wall finishes in mirror and black satin back painted glass; ceiling in white factory finished folded metal panel with recessed lighting and concealed lighting to edges. Doors in satin stainless steel. Stainless steel design details in the lift Stainless steel control panels and stainless steel handrails Stairs and Adjacent Lobbies All ceilings and walls in painted finishes New balustrades and new handrails New linear lighting and emergency lighting New concrete-effect ceramic tile to stair treads and landings New contrasting nosings, edge detail threshold transition strips between finishes Basement Plant Areas Painted flooring, bunds and plinths to specific plant items; painted decorations to walls, floors and soffits Others Full operations and maintenance manuals in line with the CDM Advisor and client s required formats BMS Room Raised floor Painted walls and soffit Worktop and task chair for building manager Simple table and chairs with small tea point for reception staff. TateHindle Limited Page 10

11 3 Architectural Design Criteria U Values All new parts of the fabric are Part L2B compliant. Existing element U values Element Walls Pitched roof Flat roof Floors Windows Doors Curtain walling High usage entrance doors for people Vehicle access and similar large doors Roof ventilators W/m2K Proposed element U values Minimum Standards for New Controlled Fittings (ADL2B Table 3) Fitting Windows, roof windows and glazed roof lights Alternative option for windows in buildings that are essentially domestic in character Plastic roof light Curtain walling Pedestrian doors where the door has more than 50% of its internal face area glazed High usage entrance doors for people Vehicular access and similar large doors Other doors Roof ventilators W/m2K 1.8 W/m2K for the whole unit A window energy rating of Band C 1.8 W/m2K 1.8 W/m2K (overall) 1.8 W/m2K for the whole unit 3.5 W/m2K 1.5 W/m2K 1.8 W/m2K 3.5 W/m2K Minimum Standards for New Thermal Elements (ADL2B Table 4) Element Wall Pitched roof insulation at ceiling level Pitched roof insulation and rafter level Flat roof or roof with integral insulation Floors W/m2K 0.28 W/m2K 0.16 W/m2K 0.18 W/m2K 0.18 W/m2K 0.22 W/m2K TateHindle Limited Page 11

12 Minimum Standards for Upgrading Retained Thermal Elements (ADL2B Table 5) If the existing thermal elements have a U value worse than those in column (a) then these elements should be up graded to the level in column (b) as long as this is economically, technically or functionally viable. Element (a) Threshold (b) Improved Wall cavity insulation 0.70 W/m2K 0.55 W/m2K Wall external or internal insulation 0.70 W/m2K 0.30 W/m2K Pitched roof insulation at ceiling level 0.35 W/m2K 0.16 W/m2K Pitched roof insulation and rafter level 0.35 W/m2K 0.18 W/m2K Flat roof or roof with integral insulation 0.35 W/m2K 0.18 W/m2K Floors 0.70 W/m2K 0.25 W/m2K Air Tightness To comply with approved document Building Regulations Part L2B: Conservation of Fuel & Power. Acoustics Fabric acoustically treated to suit the following noise reduction criteria, with density and insulation of materials to suit the requirements. Offices Toilets Staircases Reception area NR38 NR45 NR45 NR40 Means of Escape A single escape stair design has been adopted for this building, with the escape routes designed to an occupancy level of 1 in 6.8sqm. WCs Unisex WC provision designed to occupancy on a floor-by-floor basis at 1 in 8sqm. TateHindle Limited Page 12

13 4 Floor to Ceiling Schedule (Approximate) Note: This schedule is 'approximate' and subject to builder s tolerances. Proposed Proposed Zones Ceiling SSL Top of Raised Floor Underside of Suspended Ceiling* U/S Soffit Slab to slab FFL- FCL Raised Floor Panels Floor zone (Inc. panel & tolerance) Ceiling/ system & lighting zone Zone (Inc. lighting, ceiling system & beams) + from datum mm + from datum + from datum mm m mm mm mm mm TBC Roof plant n/a n/a n/a n/a n/a n/a n/a n/a n/a Plant room n/a n/a n/a n/a n/a n/a n/a Fifth vaulted 28mm pan 255 n/a n/a Fourth mm pan 100 n/a n/a Third mm pan 100 n/a n/a Second mm pan 100 n/a n/a First mm pan 100 n/a n/a Ground mm pan 100 n/a n/a Basement mm pan 100 n/a n/a * Suspended ceiling to lift lobby in office space at 5, WCs/lobbies and showers/locker room only TateHindle Limited Page 13

14 5 Mechanical, Electrical and Public Health 5.1 DESIGN PARAMETERS Winter temperature External Offices Reception -3ºC db, saturated 21ºC db, no RH control 21ºC db, no RH control Summer temperature External Offices Reception 29 ºC db, 20ºC wb 23ºC db, no RH control 23ºC db, no RH control Controls tolerance ± 2 ºC Fresh air supply Main offices 12 litres/sec/person (plus an option for an allowance of 10% for meeting rooms, areas of high occupation. Acoustic levels Offices (open plan) Toilets Staircases Reception area NR38 NR40 NR40 NR40 Occupancy Office areas 1 person per 10 m 2 (Workplace density and lift calcs) Electrical load allowance Lighting 12 W/m 2 Small power 25 W/m 2 for office areas, risers and on-floor distribution boards Lighting levels Offices Main staircase Secondary staircase Toilets Reception 350 lux to 400 lux maintained average illuminance at 0.75m working plane 150 lux maintained average illuminance at floor level 150 lux maintained average illuminance at floor level 150 lux maintained average illuminance at floor level 250 to 300 lux maintained average illuminance at 0.75m working plane TateHindle Limited Page 14

15 5.2 Electrical Installations The electrical power distribution serving floors B to 5th offices and the landlord s areas and plant rooms in the building are provided via the main landlord s low voltage switch panel located in the basement. Split-metered distribution boards are provided to serve tenants lighting and small power requirements within the individual office areas. Lighting The office areas are provided with general purpose lighting comprising modular luminaires selected to comply with the design intent of CIBSE Lighting Guide LG7. The reception is provided with decorative feature lighting scheme. Lighting control A DALI dimmable lighting control system is provided in the main offices on floors utilising lighting control modules in each office area. The system provides energy conservation via automatic control of luminaires utilising presence detection and daylight sensing. Protective installations A fire detection and alarm system is provided in line with BS 5839: Part 1 Type L2 and Building Control requirements. A CCTV system is provided to monitor external areas of the building. An intruder alarm system is provided to cover all external doors. A centralised access control system is provided for the main entry/exits to the building, lifts and entry/exits to each office floor. Communication Installations Cable trays are provided in the electrical risers for future tenants data installations. TateHindle Limited Page 15

16 5.3 Mechanical Installations The building heating and cooling central plant comprises variable refrigerant volume heat recovery systems arranged on a floor by floor basis. Condensers are located within an enclosed external plant area over the fifth floor. Communal areas are heated electrically. Air Conditioning The main office areas on basement to floor 5 are provided with heating and cooling via a 3 pipe VRV heat recovery system with exposed fan coil units. The fan coil units are provided at 1no per 27m sq on the perimeter (approx. 6.0m wide by 4.5m deep; refer to drawings) and 1no per 50 70m sq for internal areas. The ground floor reception is provided with a dedicated mini VRV system with concealed fan coil units. Office Fresh Air Ventilation The main office areas on basement to floor 5 are provided with fresh air ventilation via an air handling unit incorporating heat recovery located at roof level to serve the office areas, providing supply and extract ventilation onto the office floors via vertical ductwork risers and exposed high level distribution. Toilet Ventilation The toilet areas in the central core are provided with extract ventilation via a twin extract fan located on the roof of the plantroom. Make up air is provided by door undercut from the lobby served with fresh air from the air handling unit. Building Management System A building management system (BMS) is provided to control and monitor the M&E services systems. Tenant Plant Space The roof plant area is provided with space allocated for the future provision of tenant cooling equipment (subject to planning permission). 5.4 Public Health Installations The incoming mains water supply serves a cold water storage tank from which boosted cold water is distributed throughout the building. The hot water is generated by local electric water heaters within the disabled toilet on each floor and basement showers. Each office area is provided with capped drainage and cold water supplies for future extension by the tenant to serve teapoint areas. TateHindle Limited Page 16

17 6 Structural Design 6.1 Structural Arrangement The existing building consists of a partly retained office building, constructed in 1982 and a new extension constructed in The existing retained building consists of a reinforced concrete frame, with reinforced concrete columns supporting 325mm thick waffle slab floors. The new extension consists of a steel frame building with steel columns supporting 200mm approx. deep steel UC section beams supporting 150mm thick composite metal deck floor slabs. Columns in the retained building consist of 400mm square exposed reinforced concrete columns. Columns are arranged on a 5.5m - 6.1m by m grid. Columns in the new extension consist of 200 by 200 H-section steel columns exposed and painted with intumescent paint. Columns are arranged on a 5.7m 6.0m by 4.3m 5.3m grid at ground floor and a 3.2m 5.7m by 4.3m 4.5m grid at first floor and above. Stability of the new and existing building is provided by braced steel frames in the new extension around the stair and lift core and against the party wall with Folgate Street. The retained and new floor plates are tied together at each floor level such that the stability of the retained building is provided by the bracing in the new extension. The foundations to the existing columns consist of 3m square by 2m deep mass concrete pads bearing in gravels. The foundations to the new structure below basement level consist of a large reinforced concrete raft supporting new and existing columns. The raft bears onto the remnants of the previous mass concrete pad foundations which in turn bear into sand and gravel. The foundations to the new extension to the rear of the basement consist of bored cast in-situ concrete piles with piles caps at each column position and ground beams supporting the ground floor slab. 6.2 Floor Loadings The proposed structure is designed for the specified loads generally in accordance with the British Council of Offices Guide to Specification The design floor loadings are shown on Sinclair Johnston & Partners loading plan drawings 8410/ The existing retained building was designed in 1982 as an office building. At that time we would expect the structure to have been designed for office loading as defined by CP3 Chapter V-1: For general offices the design imposed loading would have been 2.5kN/m 2 plus 1kN/m 2 allowance for moveable partitions. The building was in use as offices prior to the current modifications, and we are not aware of any indications of the existing structure being overloaded. No specific assessment of the imposed load capacity of the existing structure has been carried out. TateHindle Limited Page 17

18 Offices above ground floor General office floors: 2.5kN/m 2 plus 1.0kN/m2 allowance for demountable partitions over approximately 95% of lettable floor area. High load areas: 7.5kN/m2 over approximately 5% of lettable floor area Raised Floors, Ceilings and Building Services Equipment: 0.85kN/m2 Offices at and below ground floor General office floors: 3.0kN/m 2 plus 1.0kN/m2 allowance for demountable partitions over approximately 95% of lettable floor area. High load areas: 7.5kN/m2 over approximately 5% of lettable floor area Raised Floors, Ceilings and Building Services Equipment: 0.85kN/m2 Plant Rooms and Roof Plant 6.3 Vibration Live Load: 7.5kN/m2 The proposed structural slab vibration due to footfall impacts, plant items and lifts etc. was reviewed by the Design Team to ensure that mid-span excitation is such that there is a low probability of adverse comment when assessed in accordance with Tables 5.3 and 5.4 along with Section 5.3 of SCI Guide P354: Design of Floors for Vibration Footfall induced vibration characteristics of the existing floors has not been investigated. However it would be reasonable to expect that 325mm thick waffle slab floors spanning up to 6m between columns would not suffer from excessive vibration due to footfall. 6.4 Future Flexibility No specific provision has been made for interlinking floors by tenants. The Structural Engineer will advise regarding the opportunities to incorporate openings within the floor slab for the possible interlinking of contiguous floor by future tenants. 6.5 Structural Fire resistance The new structure has been designed for a fire resistance period of 60 minutes. This is achieved by applying intumescent paint coatings to the new exposed steel structure. The fire resistance of the existing structure has not been investigated; however we would expect it also to have been designed for a fire resistance period of 60 minutes. The columns sizes, slab depth, rib thickness and indicated cover are consistent with 60 minutes fire protection. TateHindle Limited Page 18