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Install question
#1
Hi all, just got new contract to service a large college campus , they installed new suspended ceilings almost throughout building, approx 500mm down from old concrete hollow core. The existing smoke detectors were on the concrete , it is all wired in pyro, they have not moved the smoke detectors down to new ceiling tiles, instead they fitted a plastic grid type tile under each smoke detector . They assume the smoke will travel up through these grid tiles. Cant see how this would be up to any fire standards. What do you think.
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#2
Will Loyd will be your man for this one.
Nothing is foolproof to a sufficiently talented fool...   24

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#3
(18-06-2019, 10:31 PM)dcarney Wrote: Hi all, just got new contract to service a large college campus , they installed new suspended ceilings almost throughout building, approx 500mm down from old concrete hollow core. The existing smoke detectors were on the concrete , it is all wired in pyro, they have not moved the smoke detectors down to new ceiling tiles, instead they fitted a plastic grid type tile under each smoke detector . They assume the smoke will travel up through these grid tiles. Cant see how this would be up to any fire standards. What do you think.

If I remember right it depends on the size of the holes, Not really a good idea though
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#4
No no for me.
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#5
(18-06-2019, 11:07 PM)Mr C Wrote:
(18-06-2019, 10:31 PM)dcarney Wrote: Hi all, just got new contract to service a large college campus , they installed new suspended ceilings almost throughout building, approx 500mm down from old concrete hollow core. The existing smoke detectors were on the concrete , it is all wired in pyro, they have not moved the smoke detectors down to new ceiling tiles, instead they fitted a plastic grid type tile under each smoke detector . They assume the smoke will travel up through these grid tiles. Cant see how this would be up to any fire standards. What do you think.

If I remember right it depends on the size of the holes, Not really a good idea though
  BS5839 22.3 m)

Detectors above a perforated false ceiling may be used for protection of the area below the false ceiling if:
1) the perforations are substantially uniform, appear across the complete ceiling and
2) the minimum dimension of each perforation in any direction is 10 mm; and
3) the thickness of the ceiling is not greater than three times the minimum dimension of each perforation.
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#6
(19-06-2019, 05:55 AM)Mr C Wrote:
(18-06-2019, 11:07 PM)Mr C Wrote:
(18-06-2019, 10:31 PM)dcarney Wrote: Hi all, just got new contract to service a large college campus , they installed new suspended ceilings almost throughout building, approx 500mm down from old concrete hollow core. The existing smoke detectors were on the concrete , it is all wired in pyro, they have not moved the smoke detectors down to new ceiling tiles, instead they fitted a plastic grid type tile under each smoke detector . They assume the smoke will travel up through these grid tiles. Cant see how this would be up to any fire standards. What do you think.

If I remember right it depends on the size of the holes, Not really a good idea though
  BS5839 22.3 m)

Detectors above a perforated false ceiling may be used for protection of the area below the false ceiling if:
1) the perforations are substantially uniform, appear across the complete ceiling and
2) the minimum dimension of each perforation in any direction is 10 mm; and
3) the thickness of the ceiling is not greater than three times the minimum dimension of each perforation.

This
www.fia.uk.com

Technical Manager FIA

All comments and views are mine own and may not reflect the views of FIA
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#7
that's great guys, the perforation tile does not cover the complete ceiling only 1 tils so that is definitely a no no , perforations would be 10mm and the tile thickness would pass too. They will have some serious alterations to look at , thanks Mr C and Will
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#8
(19-06-2019, 08:45 AM)dcarney Wrote: that's great guys, the perforation tile does not cover the complete ceiling only 1 tils so that is definitely a no no , perforations would be 10mm and the tile thickness would pass too. They will have some serious alterations to look at , thanks Mr C and Will

Looks like they are fitting perforated tiles over most of the ceiling then!!
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