I would like to hang an infrared heater from the centre of this roof, with screws going across two of the beams.

 

My structure is as follows:

• 150 x 47mm beams at 3.6m long. 
• Beams sit on the walls spanning  3 meters across.
• The span between beams is 600mm.
• Cold Roof consists of:
  • Insulation between the beams
  • 22mm chipboard on top
  • EDPM on top of that
  • Underneath includes 12mm plasterboard.
  • Plaster Skim underneath the plasterboard.

 

My options are below, but I can't work out what load the rood can actually take. Can anyone cleverer than myself help advise me here?

 

1. 850mm long @ 8.5kg
2. 1200mm long @ 11.5kg
3. 1550cm long @ 18kg

 

I basically want to avoid the roof collapsing in on itself in the next 5 years! Thanks in advance.

 

 

Option 1 to 3 are all insignificant as far as weight is concerned. Ideally attach to the 150 beams.

 

FYI - A sheet of plasterboard is around 20kg.

I am no structural engineer, but I would say all of these would be fine. Just make sure you find the beam and fix it it using appropriate fixings for the weight.

 

My only concern would be if there is any potential structural issues with the timbers such as splits or rot. Otherwise, should be fine.