1 Structure

1.1 Superstructure

Steel framed superstructure with lightweight concrete slabs on profiled metal decking.

1.2 Floor Loading

4.0 kN/sq m +1.0 kN/sq m to office areas.

1.3 Façades

A mix of brickwork stucco and Portland Stone with traditional timber sash windows and curtain walling with high performance glass.

1.4 Roof

Flat and sloped roof areas comprising high performance hot melt membrane overlaid with insulation and paving slabs and natural aluminium standing seam to sloped areas.

1.5 Critical Dimensions

Slab to slab:
3.55m nominal Lower Ground, First to Fourth 4.10m nominal Ground floor 3.60m nominal Fifth floor

Floor to ceiling:
3.20m Ground floor 2.65m First to Fifth floors 3.40m Reception

Raised Floors:
150mm (nominal)

1.6 Grids

Planning
The building is designed around a 1.5m grid.

Column
The structural column grid is variable to suit retained façades / internal layout. The plan depth of the office ranges from 9m to 15m with an average depth of 12m.

2 Internal Finishes

2.1 Entrance and Reception

Glazed entrance screen with automatic glazed revolving doors and power-assisted pass doors for general and disabled access. Feature American White Oak veneered timber panelled wall to seating area, incorporating edge-lit glass panels. Feature illuminated glass screen, adaptable to take future signage to reception area if required. The reception floor has a natural Blue Acero limestone slab finish.

Bespoke reception desk with provision for double work station with white Corian base and timber veneer panels with integral feature lighting. Level entrance for disabled access from the street and a 1:15 ramp up to raised lift lobby level is provided.

2.2 Lifts

The lift car finishes incorporate stone tiles to match reception area floor, stainless steel skirtings and white back painted glass panels to lift walls with stainless steel handrail.

2.3 Office Areas

Fully accessible medium grade raised floor system.

Emulsion paint finish to walls.

High quality perforated metal tile suspended ceiling system on metal framed grid. Metal tiles arranged to grid with lay-in acoustic mat.

American White Oak veneered, solid core doors with stainless steel ironmongery.

Tea station provision with capped off services within main core tenant riser.

2.4 WCs

Floors are finished in ceramic technical stone tiles.

Walls are white back painted glass panels behind urinals in male toilets. Cubicles comprise spray painted side panels and full height American White Oak veneered back panel with recessed tiled skirting. Cubicle doors are full height American White Oak veneer.

Sanitary fittings are white vitreous chinaware with chrome finished tapware.

Vanity units are cantilevered technical stone with full width mirrors with feature lights over.

Soap dispensers are built into vanity tops along with shaver points in male toilets. Hand driers are provided.

2.5 Doors and Ironmongery

Solid core American White Oak veneer doors with satin stainless steel ironmongery.

2.6 Core Staircases

All staircases have painted plasterboard walls with stainless steel balustrades and handrails with carpet tile flooring.

3 Air Conditioning

3.1 Offices

The offices are air conditioned by means of a four pipe fan coil ceiling mounted system. The distribution system is designed so that office floors can be let on an equal split and floor by floor basis. Conditioned air is supplied to the office space through linear diffusers located at the perimeter of the building and/or square louvre faced diffusers serving internal areas.

Return air is drawn back into the fan coil units through non-active linear diffusers using the ceiling void as an extract plenum. The most economically and environmentally appropriate refrigerant that has zero ozone depletion potential and that will be available for a minimum of 10 years has been used.

3.2 Reception

Comfort cooling is provided by a combination of heating, cooling and ventilation. Local fan coil units are placed within the reception to provide air conditioning to this area together with low level electric heaters for the receptionists.

3.3 WCs

WC accommodation is mechanically ventilated by a dedicated central extract fan set located at roof level.

4 Design Parameters

4.1 External Design Conditions

The maximum Summer external conditions for general design purposes are 29°C db, 20°C wb.

The minimum Winter external design conditions for general design purposes are -4°C, saturated.

4.2 Internal Design Conditions

Summer
22ºC +/- 2.0ºC dry resultant.

Winter
21ºC +/- 2.0ºC dry resultant.

4.3 Cooling Loads

Lighting
15 W/sq m

Tenants Small Power
25 W/sq m

4.4 Fan Coil Density

Perimeter zones
1:27 sq m

Internal zones
1:50 - 80 sq m

4.5 Ventilation Rates

Fresh air for occupancy provided at a rate of 12 litres / sec per person for the offices assuming occupancy density of 1 person/ 10 sq m.

4.6 Occupancy

Means of Escape
1 person per 7.8 sq m (NIA).

Services
1 person per 10 sq m (NIA).

WCs
1 person per 10 sq m (50/60% split male/female) (NIA). Disabled WC provision is one per floor.

Lifts
Two 13 person passenger lifts and one 21 person passenger/fire lift. The lifts provide a morning up-peak traffic performance with a waiting interval of less than 30 seconds at a 5 minute arrival rate of 15% calculated in accordance with CIBSE Guide D at an occupational density of 1 person/12 sq m.

Showers
3 no. showers provided at Lower Ground floor.

4.7 Acoustic Criteria

Open plan offices
NR 38

WCs
NR 45

Reception and circulation
NR 40

5 Electrical Services

5.1 Power Supply

Landlord’s areas:

Lighting
20W/ sq m

Small power
10W/ sq m

HVAC plant
30W/ sq m

Tenants’ areas:

Lighting
15W/ sq m

Small power
25W/ sq m

HVAC plant
60W/ sq m

5.2 Internal Lighting

The office accommodation is illuminated to achieve 300-500 lux at desktop height (0.75m AFFL). The lighting is compatible for CIBSE Lighting Guide LG7.

6 Fire Alarms and Means of Escape

Fire alarm and detection systems comply with BS 5839 Part1 2002 and are arranged as a single stage evacuation with type L2 level of detection.

7 Landlord’s Generator Provision

A Landlord’s generator set of 150 KVA is located at roof level to provide essential electrical supplies for the fire fighting lift, the fire core smoke ventilation system, and the fire core lighting systems.

8 Tenants’ Plant

Roof space is allowed for the future installation of a Tenants’ LV standby generator, satellite dish aerial and cable wire ways within electrical Tenants’ riser.

9 Security Systems

Carcass conduit and trunking wireways, terminated at the reception desk, have been provided for future provision of an intruder alarm system to protect all external doors and CCTV surveillance system to the external access ways around the perimeter of the property.

10 BREEAM

A ‘Very Good’ BREEAM rating has been achieved.