Different levels in loft

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I'm trying to put up some boards in my loft. I've taken a lot of pictures but it's so dark and dirty in there I'm hoping it's possible to make out what I'm talking about.

Down the centre are two large joists - currently the previous owner had partially boarded by putting some large sheets of chipboard between the two joists - these are quite big i.e. I'm sure they're considerably bigger than standard loft boards, however they are sagging quite badly - this was something our surveyor picked up, the upstairs ceilings were sagging due to the amount of items stored in the loft but he thought all would be fine once the items were removed. (as a separate point, the boards seem to have been GLUED down rather than screwed which is going to require a bit of force!)

So I'm in the process of trying to remove the current boarding and put down a new one, extending this over the whole roof. As the joists are higher than the beams that I'm planning on putting boards over, I'm assuming that the best solution would be to use risers to level this out (and due to the insulation height)?

My other query is boarding between the two joists - if standard loft boards don't span the distance would people use some longer boards? or create a frame to lay standard boards on (although this would raise the height further creating more of a mismatch between the central boarding and the outside sections).

This is the first time I've attempted this - I was initially worried about the small size of the beams but the surveyor has assured me they should handle a modest amount of weight.

Appreciate these are fairly basic questions! Any advice much appreciated.
 

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your plan wont work - any pressure on the original loft joists will cause the ceiling below to buckle or crack.
compresin the insulation is bad practice.
unless you try for a loft conversion standard floor your scheme wont work.

the roof tiles have been whats called torched with sand and cement and its crumbling away. thers no roof felt or insulation in the rafters.. you might need a new roof before a new floor.
 
your plan wont work - any pressure on the original loft joists will cause the ceiling below to buckle or crack.
compresin the insulation is bad practice.
unless you try for a loft conversion standard floor your scheme wont work.

the roof tiles have been whats called torched with sand and cement and its crumbling away. thers no roof felt or insulation in the rafters.. you might need a new roof before a new floor.

Thank you very much for your reply.

Can I ask what is it about these loft joists that means they aren't up to taking any additional weight?

I was going to put down loft board risers first to avoid compressing the insulation.

Re: roof cement, that's interesting. The surveyor pointed out that there was no roof felt but also said there wasn't much wrong with the roof and it should last a while!
 
your loft joists were sized on instalation just enough for the span and ceiling weight - no more.
i didnt say you need a new roof - but you might.
given no felt an decaying torchin the tile must be getin on?
an if you intend to use the loft then you maybegot problems
 
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your loft joists were sized on instalation just enough for the span and ceiling weight - no more.
i didnt say you need a new roof - but you might.
given no felt an decaying torchin the tile must be getin on?
an if you intend to use the loft then you maybegot problems

Thanks - so in that case are most boarded lofts asking for trouble? Or do these people have larger/stronger joists?

This might seem like a stupid question I'm just trying to understand is my loft different to others? I'm just after storing some boxes (not a loft conversion).
 

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