Fixings for lighting bar into ceiling above? (50KG load)

[eveares]

I need to mount a 2.4 meters long section of 50mm x 25mm mild steel box section into the ceilings joists where it will support about 50kg of disco/stage lights. I also can't easily get above the ceiling due to a room above.

There also needs to be about 100mm between the top of the box section and the ceiling.

The M12 x 250mm coach bolts here: http://www.tradefixdirect.com/screws-accessories/coach-screws/bzp-coach-screws would do; but are rather expensive at £20 when I only need about 4 or 5.

Any ideas; Are Rawlbolts sutiable for hanging heavy loads from the ceiling?

Edit: My joists are about 40mm wide.

 

[Burnerman]

Coach screws are what you need here.....so long as you can screw directly into the ceiling timbers.
Are you going to use a tubular spacer, or something to provide you with the gap you need?
John

 

[foxhole]

http://www.screwfix.com/p/zinc-plated-screw-eyes-12ga-x-55mm-pack-of-10/17867
Then chain to support the lights.
[cheapest in wilko you can fill a bag for £2.99]
Need to make sure you hit the joists.

 

[eveares]

Don't really want to go down the chain route, I want the bar fixed ridged.

Are these suitable?: http://www.bryson.co.uk/product/index/03401ShieldsOnly

 

[Burnerman]

Expanding bolts are really for masonry.....coach screws are what you need, for that sort of weight.
John

 

[eveares]

I will just use some 200mm M12 coach bolts; These seem reasonably priced:

http://www.ebay.co.uk/itm/Coach-Tim...371?pt=LH_DefaultDomain_3&hash=item5895332263

I will have a 80mm (revised from 100mm) gap from the ceiling + the 25mm thickness of the bar; that will leave me 95mm of coach bolt going through the plaster board and into the joists.

Should be enough right?

 

[Burnerman]

Sure, so long as you hit the joists! Forgive my caution, but that sort of weight crashing down is best avoided!
John

 

[eveares]

Sure, so long as you hit the joists! Forgive my caution, but that sort of weight crashing down is best avoided!

Especially when it will be directly above my bed! (i'm serious)

 

[Burnerman]

Each to their own
I was never that young!
John

 

[eveares]

Whether it's a 13kg Moving head above my bed or above a stage, you just as doomed if it falls and lands on your head.

I will be hanging these + a couple of led par cans. (see photo)

Untitled

• eveares
• 1 Mar 2015
• 1