Gregor
Member
Registered: 28th Nov 03
Location: Paisley, Renfrewshire
User status: Offline
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Jules whats likely to happen when you dont strengthen the joists ?
Sounds daft to ask because most people will say "you'll fall through the roof" but thats surely not going to happen ?
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JadeM
Premium Member
Registered: 9th Feb 06
User status: Offline
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Roof could colapse / subside!!
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Gregor
Member
Registered: 28th Nov 03
Location: Paisley, Renfrewshire
User status: Offline
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From the weight of a bed/person 
I really cant see that happening
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Tom J
Organiser: South Wales
Premium Member
Registered: 8th Sep 03
Location: Bridgend
User status: Offline
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quote:
Originally posted by JadeM
Roof could colapse / subside!!
do you mean the ceiling? Surely downward force on the ceiling joists wouldn't effect the actual roof or am i wrong 
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Gregor
Member
Registered: 28th Nov 03
Location: Paisley, Renfrewshire
User status: Offline
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I don't understand how it could happen at all.
Fair enough if you had an en-suite etc up there/a proper loft conversion but a room with a bed
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JadeM
Premium Member
Registered: 9th Feb 06
User status: Offline
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quote:
Originally posted by Tom J
quote:
Originally posted by JadeM
Roof could colapse / subside!!
do you mean the ceiling? Surely downward force on the ceiling joists wouldn't effect the actual roof or am i wrong
Well....there not there for show!!! triangular shaped frame supporting the weight of the roof, if you overload any of those sides it could give!!!
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Tom J
Organiser: South Wales
Premium Member
Registered: 8th Sep 03
Location: Bridgend
User status: Offline
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oh i get you, thought they were mainly to keep the ceiling up tbh
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JadeM
Premium Member
Registered: 9th Feb 06
User status: Offline
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Yea plasterboards tacked on aswell but there mainly there to take the load of whatevers above!!
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Jules S
Premium Member
Registered: 24th Dec 03
User status: Offline
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Jade (or the male version) has the right idea.
The trusses are designed with triangulation in mind to provide vertical stability to the roof dead load (ie tiles felt etc) there is a factor built in to cover any 'live' load (snow frost etc)
The trusses simply aren't designed to have loads of load imposed internally. For example they are usually doubled up (at least) under any water storage tanks that are placed in the loft.
However, its unlikely that the roof will 'collapse' if you do a conversion. its more likely that the trusses will deflect (twist) under the loads....and cracks will appear to ceilings, felt will tear, tiling battens snap, tiles displace, water ingress etc etc etc
All in all not a great idea....as stated previously you will need building regs approval to do it anyway. Any surveyor looking at your gaff for mortgage purposes would pick this up in a nano second
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