plywood on garage roof

[ianphilip007]

hi

bit of a strange one but does anyone know how thick the plywood on the cieling of a flat garage roof usually is?? need to put up some light fittings but dont want to cause it to leak by piercing the menbrane or actual roof covering, fittings not very heavy 4 1/4 inch screws should do. be a pain in the --- and look ugly if i have to batten between exsposed joists

 

[WPD Lad]

Should be 18mm but don't be surprised if the builders skimped

 

[ianphilip007]

should be ok with a 1/4 inch screw just to check nothing in either wiring or building regs that prevent mounting a batten fitting on a plywood garage cieling is there ?? all i could find was that the fitting has to be f marked. anyone know of anything else ???

 

[Top Cat]

hi

bit of a strange one but does anyone know how thick the plywood on the cieling of a flat garage roof usually is?? need to put up some light fittings but dont want to cause it to leak by piercing the menbrane or actual roof covering, fittings not very heavy 4 1/4 inch screws should do. be a pain in the --- and look ugly if i have to batten between exsposed joists

Wow 4 and a quarter inch screws, i think you may go through the plywood! Lol

 

[parker56]

my only concern would be, if there are any leaks a few weeks/mounths down the road you will get the blame.

 

[ianphilip007]

thats a good point because you just dont know if the membrane has been pierced. ok think ill have to fit battens to joists to be on safe side

 

[parker56]

sorry but coming from the motor trade many years ago I got used to the (since you people)
SINCE YOU DID MY BRAKES MY STERO NOT WORKING. LOL

 

[Guest111]

If you don,t want to batten between joists just stick a batten to plywood with gripfill use some 3"x1" and jobs a good one.

 

[parker56]

Phil d proper job.

 

[Kiers1970]

Drill a test hole through it, measure, voila, you know the depth!

 

[Guest111]

Drill a test hole through it, measure, voila, you know the depth!

yes but in that case he will damage the roof which is precisely what he wants to avoid.

 

[Kiers1970]

Phil.... Really!!!!

 

[Geordie Spark]

It "should" be 18mm & may be a kind of fibreboard (Besaboard ??) instead of plywood.

edit .... sorry - that should read Sterling board

 

[parker56]

can't say i would drill a test hole,cost a lot of money to repair if you get it wrong.

 

[Adam W]

sorry but coming from the motor trade many years ago I got used to the (since you people)
SINCE YOU DID MY BRAKES MY STERO NOT WORKING. LOL

Well that happened to me - took my car to Kwik Fit to get a few things sorted (exhaust, brakes, new tyre) picked it up and the handbrake had about twice as much travel on it. I mentioned that and they tightened it, but said it was strange because they hadn't touched it. Then the stereo kept cutting out and the ABS light flashed; took it back to them, they plugged their fault code reader and couldn't find anything wrong.
Next day the headlights were flashing, stopped at the traffic lights and the speedometer went to 100mph. Left it with them for their expert to sort out, it was done by the end of the day. Apparently it was a problem with the 'earth' - according to the mechanic, cars use the tyres as an earth electrode (not sure if that was a deliberate wind-up).

Garage customers are right to be suspicious of mechanics.