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there are two types of access floor tiles which are die formed welded steel construction and die formed welded steel shell with cement inside it. as noticed the one is hollow can be used as perforated tiles. also,
the one with cement is used to withstand high loads.there were two types of access floor tiles which are wooden and steel galvanized tiles.these two types are no longer in the market as the wooden type isn't fire rated and can lead to a disaster when afire begin. also steel galvanized tiles will lead to zinc whiskers which can end on circuit board and make a short circuit. the modern type of access floor tile is covered with vinyl film which is plastic film called HPL ( high pressure laminate). there are three types of loading factor on floor tile:
1- uni formally distributed load (UDL): this load come from anything has flat base and mounted on the floor on its flat base. rating of this load is expressed in KN/squared meter.
2-concentrated load / point load (PL): the area of the point is 25 mm squared, the weakest area is the center of the tile as the sides is rested on the stringers and the pedestals so it has extra support so try to align the casters and foots of racks to the side of the tile.
3- rolling load: this load comes from moving of racks on its wheels as this wheel create a damage more than any other load. this load is defined by the size and hardness of the wheel and the weight over it. when the wheel move on the tile, it create wave effect. you can protect tiles by using aluminum plates.
Access floor standards:
- European standard BS/EN 12825: the raised floor must withstand a uniform load of 12.2 KN/squared meter or a load of 454 kg on any 6.5 cm squared, with maximum deflection of 2.5 mm.
- UK-PSA MOB PF2 standard (property service agency):
light tile withstand 1.5 KN for PL and not more 6.7 KN per squared meter for UDL.
medium tile withstand 3 KN for PL and not more 8 KN per squared meter for UDL.
heavy tile withstand 4.5 KN for PL and not more 12 KN per squared meter for UDL.
extra heavy tile withstand 4.5 KN for PL and not more 12 KN per squared meter for UDL.
extra heavy tile must sustain a total of 11 KN applied equally on four points, every point PL on a 200*200 mm square area.
this standard is the most commonly used.
- US-CISCA (ceiling and interior systems constructors association).
- NFPA251 : fire resistant for one hour.
- IEC-61000-4-2, anti-static properties.
Access floor weights:
medium tile 13 kg/tile.
heavy tile 15 kg/tile.
extra heavy tile 18 kg/tile.
air flow panel 7.5 kg/tile.
general consideration for raised floor:
- height must be at least 40 cm (preferably 60 cm). to help build pressure to cool 3-4 k watt rack.
- pathway under raised floor should be ventilated.
- all opening must have plastic opening because of safety for wires and people.
- all opening must be sealed to decrease air leakage.
- keep under raised floor clean and well organized.
- air conditioning frame must be far from raised floor to decrease vibrations transmitted to the raised floor.
Grounding of the raised floor:
signal reference grid (SRG) is a grid provide an equal potential network with low impedance to decrease the high frequency noise currents.all racks must be bonded separately. ideally by braided cables to surrounded frame (every pedestal on the outside) and must be free of corrosion.
suspended ceiling usage:
- it is used for concealing of fire suppression, piping, cabling, etc,..
- used as return duct for the air conditioning.
- reduction of the volume of the room (fire fighting system).
- beautiful view.
- the space between the raised floor and suspended ceiling should be at least 2.6 meter.
- more height is required when overhead pathway is used.
- the clearance under water sprinklers or nozzles of gas suppression system must be higher than 45 cm to ensure proper propagation of gas or water to diminish fire.
- the space above suspended ceiling must be clean.
the one with cement is used to withstand high loads.there were two types of access floor tiles which are wooden and steel galvanized tiles.these two types are no longer in the market as the wooden type isn't fire rated and can lead to a disaster when afire begin. also steel galvanized tiles will lead to zinc whiskers which can end on circuit board and make a short circuit. the modern type of access floor tile is covered with vinyl film which is plastic film called HPL ( high pressure laminate). there are three types of loading factor on floor tile:
1- uni formally distributed load (UDL): this load come from anything has flat base and mounted on the floor on its flat base. rating of this load is expressed in KN/squared meter.
2-concentrated load / point load (PL): the area of the point is 25 mm squared, the weakest area is the center of the tile as the sides is rested on the stringers and the pedestals so it has extra support so try to align the casters and foots of racks to the side of the tile.
3- rolling load: this load comes from moving of racks on its wheels as this wheel create a damage more than any other load. this load is defined by the size and hardness of the wheel and the weight over it. when the wheel move on the tile, it create wave effect. you can protect tiles by using aluminum plates.
Access floor standards:
- European standard BS/EN 12825: the raised floor must withstand a uniform load of 12.2 KN/squared meter or a load of 454 kg on any 6.5 cm squared, with maximum deflection of 2.5 mm.
- UK-PSA MOB PF2 standard (property service agency):
light tile withstand 1.5 KN for PL and not more 6.7 KN per squared meter for UDL.
medium tile withstand 3 KN for PL and not more 8 KN per squared meter for UDL.
heavy tile withstand 4.5 KN for PL and not more 12 KN per squared meter for UDL.
extra heavy tile withstand 4.5 KN for PL and not more 12 KN per squared meter for UDL.
extra heavy tile must sustain a total of 11 KN applied equally on four points, every point PL on a 200*200 mm square area.
this standard is the most commonly used.
- US-CISCA (ceiling and interior systems constructors association).
- NFPA251 : fire resistant for one hour.
- IEC-61000-4-2, anti-static properties.
Access floor weights:
medium tile 13 kg/tile.
heavy tile 15 kg/tile.
extra heavy tile 18 kg/tile.
air flow panel 7.5 kg/tile.
general consideration for raised floor:
- height must be at least 40 cm (preferably 60 cm). to help build pressure to cool 3-4 k watt rack.
- pathway under raised floor should be ventilated.
- all opening must have plastic opening because of safety for wires and people.
- all opening must be sealed to decrease air leakage.
- keep under raised floor clean and well organized.
- air conditioning frame must be far from raised floor to decrease vibrations transmitted to the raised floor.
Grounding of the raised floor:
signal reference grid (SRG) is a grid provide an equal potential network with low impedance to decrease the high frequency noise currents.all racks must be bonded separately. ideally by braided cables to surrounded frame (every pedestal on the outside) and must be free of corrosion.
suspended ceiling usage:
- it is used for concealing of fire suppression, piping, cabling, etc,..
- used as return duct for the air conditioning.
- reduction of the volume of the room (fire fighting system).
- beautiful view.
- the space between the raised floor and suspended ceiling should be at least 2.6 meter.
- more height is required when overhead pathway is used.
- the clearance under water sprinklers or nozzles of gas suppression system must be higher than 45 cm to ensure proper propagation of gas or water to diminish fire.
- the space above suspended ceiling must be clean.
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