upstairs ceiling cracking - how to reinforce loft joists?

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16 May 2010
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Gwent
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After paying out to have the upstairs ceilings replastered (skim over the horrid artex) we've since discovered that something up there is on the move:

- There's a crack formed in line with one of the joists across the span of the master bedroom.

- Several nail-heads have popped their plaster off, leaving a line of craters.

I think the problem has been compounded by the orientation of the original plasterboard. I was intending to partially board out and use the loft for storage, but this development has kinda thrown things into doubt.

I was told by a QS friend that the roof/ceiling construction is of a suspended type: There's 2 generous beams running parallel to the apex that sit above smaller ceiling joists (probably 3 - 4inch deep) *

I suspect there's no co-incidence to the fact that where this 'problem' joist is, is also where the one of the main beams is jointed - there's an overlap of about 1m between the beam and its successor, but I think the joint between them isn't too rigid.

So, questions:

How can I stop the ceiling moving, and also re-inforce the loft floor to take loft boards carrying boxes of junk?

This needs to be minimal hassle/intrusion into the living space, i.e. not tearing ceilings down. And preferably not vastly expensive using expensive materials or techniques that require a tradesperson.

I was considering (in sequence):

1 strengthen the iffy joint on the main beam, drill & bolt? Glue?

2 installing thicker joists parallel to the existing ones, but how to secure to the beams? place on top, or alongside?

3 board over.

*Can upload photos tomorrow if required..
 
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Failed to get a camera up there, but managed a tape measure:

ceiling joists are 1.5" x 4" deep.
Supporting beams are 2x4"

on average 450mm (18") between joists (this figure varies a bit)
about 2.1m (7ft in old money) between supporting beams

The ceiling line is above the eaves of the house - the ceiling drops by the outside walls of the upstairs rooms. I've no idea if this is relevant.

Another detail is there's some massive C-section steels bolted to the roof trusses, running parallel to the line of the terrace. I believe these were installed shortly after the terrace was built to remedy some subsidance that has obviously happened in the pasts.

Any thoughts anyone?
 

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