Joist
- Thread starter notb665
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depeding on how solid the ceiling is you may be able to hear the differnce when you are tapping on a joist
failing that a minture metal detector may find the nails and hence the joist lines
also won't you need to get power to this fan somehow?
failing that a minture metal detector may find the nails and hence the joist lines
also won't you need to get power to this fan somehow?
I have done tapping on (and fishing in) dot and dab before and that worked, yes. The ceiling in question is quite thick and I am afraid of mistaking a lath for a joist if I push my spike through. I changed the position of the besa in my airing cupboard OK when I had to, but I am not an expert, just a damn good amateur: I wondered if there was a special way the professionals did it.
Good idea on the minature metal detector, thanks. I may try that, although...
There is already power there, just to a normal rose. The only thing the electrician who re-wired the house (before I lived there) did not do which I would've is put a wood noggin across the joists to support any fitting. Obviously a fan needs a strong support.
Good idea on the minature metal detector, thanks. I may try that, although...
There is already power there, just to a normal rose. The only thing the electrician who re-wired the house (before I lived there) did not do which I would've is put a wood noggin across the joists to support any fitting. Obviously a fan needs a strong support.
Another trick that may or may not work depending on the construction is freezer spray - the insulating properties of the ceiling are different where there is or is not a joist. Spray freezer until it ices over, and then watch it clear in stripes. Only works if there is either no insulation alongside the joist or it is very good insulation, and the joist is clearly the the better or worse thermal path.
I would say this doesn't always work, particularly if there is a draught, and is less reliable than mechanical methods like drilling behind the rose and looking with a dental mirror, but in a tight spot, especially if you have an aerosol freezer spray in the tool box already (its an old standby of most TV repairmen for shaking out faults that are intermittent) then its one to try.
I would say this doesn't always work, particularly if there is a draught, and is less reliable than mechanical methods like drilling behind the rose and looking with a dental mirror, but in a tight spot, especially if you have an aerosol freezer spray in the tool box already (its an old standby of most TV repairmen for shaking out faults that are intermittent) then its one to try.
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