K41 |
RAISED ACCESS FLOORS |
|
To be read with Preliminaries/General conditions. |
|
TYPE OF RAISED ACCESS FLOOR |
110 |
RAISED ACCESS FLOOR TO MEZZANINE |
• |
Level of access: Full. |
• |
Floor panel size: 600 x 600 mm. |
• |
Installed mass of system (maximum): 40 kg/m2. |
• |
Finished raised access floor height above subfloor: 175 mm. |
|
|
|
|
GENERAL |
209 |
STANDARDS |
• |
Raised access flooring system: To MOB PF2 PS/SPU. |
• |
Manufacturer's quality management system: To BS EN ISO 9001. |
210 |
INTERPRETATION |
• |
Authority: References to Authority in MOB PF2 PS/SPU are to the Employer. |
211 |
GENERAL PERFORMANCE |
• |
Completed installation: Clean and stable. Free from bounce and vibration. No lipping between floor panels |
212 |
STRUCTURAL PERFORMANCE |
• |
Uniform distributed load: 10 kN/m2. |
• |
Concentrated loads: 5.5 kN/(300 x 300) mm2. |
• |
Point loads: 3.5 kN/(25 x 25) mm2. |
• |
Deflection (maximum): 2.4 mm. |
213 |
HYGROTHERMAL PERFORMANCE |
• |
Onerous environmental conditions applying: None. |
• |
Deemed-to-satisfy test results: Submit, with testing authority's opinion. |
215 |
FIRE PERFORMANCE |
• |
Standard: To BS 5588-11. |
• |
Fire resistance: Normal. |
• |
Thermal properties to BS 476-20: None. |
216 |
SOUND TRANSMISSION |
• |
Laboratory system test: |
|
|
- Standard: To BS EN ISO 140-12. |
|
|
- Test report: Submit. |
218 |
DURABILITY |
• |
Fungi, moulds and insects: |
|
|
- Tests: To BS 1982 Parts 1, 2 and 3. |
|
|
- Preventive measures: Submit proposals. |
|
|
| |
COMPONENTS |
220 |
SAMPLES |
• |
Submit representative samples of floor panels with cable management accessories. |
225 |
FLOOR PANELS |
• |
Tolerances: |
|
|
- Length of side: ±0.4 mm. |
|
|
- Squareness: 0.5 mm. |
|
|
- Straightness of side horizontally: ±0.5 mm. |
|
|
- Thickness: ±0.5 mm. |
|
|
- Twist: ±0.7 mm. |
|
|
- Vertical warping: 0.6 mm. |
• |
Life expectancy (minimum), excluding coverings: 25 years. |
• |
Casing material: Steel. |
|
|
- Casing finish: Galvanized |
• |
Core material: HD particleboard. |
• |
Perimeter edging: Pressure-bonded vinyl strip. |
• |
Floor panel fixing: Gravity/drop-in. |
• |
Floor panel location method: Positive. |
• |
Labelling: |
|
|
- Nonstandard panels: Identify for relocation purposes. |
|
|
- Service identification labels: Provide self-adhesive labels to identify under-floor services and their direction. Fix to the visible surface of the floor panel, or under carpet finish if any. |
226 |
PEDESTALS |
• |
Life expectancy (minimum): 50 years. |
• |
Pedestal fixing: Adhesive |
• |
Adhesive fixing: |
|
|
- Selection of test specimens: Submit proposals. |
|
|
- Test results: Submit. |
|
|
- Adhesive: Compatible with subfloor finishing. |
• |
Adjustability: Non-adjustable. |
|
|
- Locking: Required |
• |
Additional pedestals: At perimeter. |
• |
Pedestal materials: Submit proposals. |
227 |
STRINGERS |
• |
Type: Submit proposals. |
• |
Removable stringers: Submit proposals. |
• |
Life expectancy (minimum): 50 years. |
• |
Materials: Submit proposals. |
229 |
ACCESSORIES |
• |
Service outlet boxes: |
| |
|
- Type: Separate power and comms boxes. |
| |
|
- Rate: Locations indicated on drawing MF1. |
| |
|
- Size (length x width): 600 x 300 mm. |
| |
|
- Number of power outlets per box: 6 (exp to 8). |
| |
|
- Number of data outlets per box: 2 (exp to 3). |
| |
|
- Number of phone outlets per box: 2 (exp to 3). |
| |
|
- Installation: Drop-in. |
| |
|
- Lids: Hinged 180º, carpet fixed within lid recess. |
| |
|
- Frames: Submit proposals. |
| |
|
- Structural capacity: 7 kN/m2. |
• |
Other accessories: None. |
| |
|
|
INSTALLATION |
235 |
SUBFLOOR |
• |
Type: Sheet particleboard on steel joists. |
• |
Cleanliness: Clean before installation and keep clean during installation. |
240 |
PREPARATION |
• |
Setting out: Before installation of services, indelibly mark pedestal positions. |
• |
Fixtures: Before installation, complete fixtures which floor panels are to be cut around or which supports are to bridge. |
• |
Bridging structures - supplementary supports: Not needed. |
250 |
ENVIRONMENTAL CONDITIONS |
• |
General: |
| |
|
- Dry, well ventilated, not subject to extremes of temperature or humidity, and free from rapid variations of temperature or humidity. |
| |
|
- RH of air (maximum): 75%. |
| |
|
- RH of surrounding walls (maximum): 75%. |
• |
Subfloors: |
| |
|
- RH (maximum): 75%. Test to BS 8201 using an accurately calibrated hygrometer. |
| |
|
- Temperature (minimum): 5°C. |
330 |
CUT FLOOR PANELS |
• |
Size (minimum): Half full width, full length. |
• |
Burrs and rough edges: Make smooth. |
• |
Edge sealer: Class 0 spread of flame rated aluminium foil self adhesive tape. |
• |
Edge sealing: Seal exposed cut edges of floor panels which have moisture sensitive or combustible cores. |
345 |
RAISED ACCESS FLOOR LEVELS |
• |
Permissible deviations in level: |
| |
|
- Over 3 m: ±1.5 mm. |
| |
|
- Over all: ±3 mm. |
350 |
EXPANSION GAPS |
• |
Expansion gaps: |
| |
|
- Size: 10 mm. |
| |
|
- Location: At abutments. |
• |
Expansion gap filling: |
| |
|
- Filler type: Resilient closed cell. |
| |
|
- Filling: Before fixing skirtings and cover strips. |
360 |
CAVITY BARRIERS |
• |
Construction: |
| |
|
- Material: Self-supporting mineral wool slabs. |
| |
|
- Fire resistance to BS 476-20:
Integrity/insulation: 30/- minutes. |
• |
Performance: Permanently stable, continuous, and an effective barrier to smoke and flame. |
• |
Distribution: |
| |
|
- Centres (maximum): 10 m. |
| |
|
- Subdivided areas (maximum): 64 m2. |
• |
Fixing: Fix securely to subfloor, at joints and as necessary. |
• |
Floor panels: Firmly secure floor panels above cavity barriers. |
• |
Gaps between cavity barriers and other elements: Seal with mineral wool or other suitable material. |
• |
Fire stopping: Give notice when fire stopping is complete. |
390 |
ELECTRICAL CONTINUITY AND EARTH BONDING |
• |
Substantial metal parts of raised access floor: Electrically continuous and fully earth bonded. |
| |
|
- Standard: To BS 7671. |
| |
. |
- Methods: Submit proposals |
• |
Earth bonding connection points: Determine number and location. Provide connectors. |
• |
Total resistance of earth fault loop (maximum): Resistance required to operate earth fault protection devices to BS 7671. |
• |
Electrical continuity and earth bonding tests: |
| |
|
- General: Test complete raised access floor. |
| |
|
- Points for testing: Randomly selected pedestals, stringers, tops and bottoms of floor panels. |
• |
Independent test laboratory: Testing Times, Newcastle. |
| |
|
|
COMPLETION |
420 |
TOOLS |
• |
Floor panel lifting devices: At Practical Completion, supply one set of suitable devices. Train designated personnel in their use. |
• |
Pedestal locking: At Practical Completion, supply one set of tools for releasing pedestal locking. |
430 |
USER INSTRUCTIONS |
• |
Manual contents: Include the following: |
| |
|
- Correct method for lifting and replacing floor panels and stringers. |
| |
|
- Servicing: Limitations on sequence, number and positions of floor panels and stringers which can be removed safely at one time. |
| |
|
- Permissible loads: With guidance on use of spreader plates when shifting heavy equipment and subsequent maintenance. |
| |
|
- Methods for installing cabling and ducts, to prevent damage to supporting structure. |
| |
|
- Cleaning methods. |
| |
|
- Pedestal adjustment and locking. |
| |
|
- Maintenance: Recommended methods and frequency. Minimum maintenance-free life of raised access floor system. Minimum maintenance-free life of replaceable parts where this differs from that of the whole system. Minimum period during which replaceable components will be available. |
| |
|
- Installation instructions, including COSHH Assessment. |
440 |
SPARES |
• |
General: At Practical Completion, supply the following: 10 full-size floor panels, 2 half-size floor panels, 1 of each type of service outlet box. |
450 |
CLEANING |
• |
Subfloors: After completion, thoroughly clean accessible areas of subfloors and leave free of dust and debris. |
• |
Raised access floor: Before delivery of items carried by floor, clean thoroughly. |
