Joist hell!

[Nozzle]

Use a small rare-earth magnet. The smaller size means it's easier to figure out the "centre" of the pull, and thus where the plasterboard screw/nail heads are

Nozzle

 

[harrycharlton]

magnets lifting floors ????? really ???rule of thumb joists genraly span the shortest distance in a room look at the floor your standing on if its wood and not floating i,e nailed down where its fixed along is the way your joists are running ..... 90% chance you ceiling joists are running the same way ..... if the floor is concrete go to the room above check where the flooring is fixed thats the way your joists are running if theres s load bearing wall or external wall that runs right from ground to furst floor height measure from that wall to the line if nails do the same on the ceiling below et voila you have your first centre ....

 

[Cgas]

magnets lifting floors ????? really ???rule of thumb joists genraly span the shortest distance in a room look at the floor your standing on if its wood and not floating i,e nailed down where its fixed along is the way your joists are running ..... 90% chance you ceiling joists are running the same way ..... if the floor is concrete go to the room above check where the flooring is fixed thats the way your joists are running if theres s load bearing wall or external wall that runs right from ground to furst floor height measure from that wall to the line if nails do the same on the ceiling below et voila you have your first centre ....

So you have fixings showing through your carpet or laminate from the room above ? Would love to see state of your gaff.......?
If op knew where the fixings for the floorboards were they wouldn't have a problem...

 

[harrycharlton]

magnets lifting floors ????? really ???rule of thumb joists genraly span the shortest distance in a room look at the floor your standing on if its wood and not floating i,e nailed down where its fixed along is the way your joists are running ..... 90% chance you ceiling joists are running the same way ..... if the floor is concrete go to the room above check where the flooring is fixed thats the way your joists are running if theres s load bearing wall or external wall that runs right from ground to furst floor height measure from that wall to the line if nails do the same on the ceiling below et voil
a you have your first centre ....

read through the thread before tryimg to look clever abive is a loft easier to lift a carpet than a floor board numbskull


So you have fixings showing through your carpet or laminate from the room above ? Would love to see state of your gaff.......?
If op knew where the fixings for the floorboards were they wouldn't have a problem...

read through the full thread above is a loft wit floor :

 

[Nozzle]

magnets lifting floors ????? really ???

No, magnets for locating screw or nail heads. Keep it simple, mate.

Nozzle

 

[LianneM85]

Well thanks to everyone's advice the pole is up! And more importantly so is the ceiling still Checked under the floorboards and they were 22 inches apart and running the opposite direction to which I thought. Used the magnet to pin point one of the definite beams, measured over to where I needed then put a hole through with a screw driver just to make sure. Did the whole knock knock thing again and can hear a bit of a difference but wouldn't have been confident using that method alone.
Dave - There's no springs involved in the pole. You have to check it before you use it and every 30 min while using to make sure it doesn't need tightening. Can be used by people up to 18stone and I'm nowhere near that

 

[Cgas]

Well thanks to everyone's advice the pole is up! And more importantly so is the ceiling still Checked under the floorboards and they were 22 inches apart and running the opposite direction to which I thought. Used the magnet to pin point one of the definite beams, measured over to where I needed then put a hole through with a screw driver just to make sure. Did the whole knock knock thing again and can hear a bit of a difference but wouldn't have been confident using that method alone.
Dave - There's no springs involved in the pole. You have to check it before you use it and every 30 min while using to make sure it doesn't need tightening. Can be used by people up to 18stone and I'm nowhere near that

Nice to hear back, well done!

 

[bernardgreen]

If I was naughty I would ask for a video to prove the pole is fully functional..........

Congratulations on the installation.