floor in attic

7 Oct 2008
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United Kingdom
i am plannig to put a proper floor in my attic space, the span of the house is approx 8mtr.

The problem there is no wall in between for the joists to rest on. what can i do
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Alex - next question ... what are you intending to use the attic space for? Storage, with occasional access or an 'unofficial' habitable room containing furniture, computer and a couple of seated people?

If for light storage your structural timbers will be OK to take chipboard loft-boarding. IMO with those un-supported spans (7m+) you shouldn't use the space for anything else unless you beef-up the structure; they'll deflect and damage (crack) the ceiling finish below.

How far apart are the joists?
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The joist will be 400mm apart with noggins in between. at the moment there is no joist in there. i have been thinking could i not carry the wall on from below with thermalite block and rest the joists on that because i would beable to do that both sides of the house leaving a small gap in between may be the stud work would take that small area.

What is the standard size joist dimension.

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