Garage/workshop roof.

[engineeringteacher]

Ladies and gentleman can you help please. Need to build a new roof with corregated bitumin panels (wicks) for my workshop. Span unsurpported is 5,20m (17') by 16'4". Want to use a 15 degree pitch ( planning regs says 12 and i wont need permission). No span tables for this shallow pitch as far as i know : . Walls are sectional concret. If I can manufacture trusses from wood, what size will I require? Am thinking of doing them in steel. I am at your mercy

 

[Mw Roofline]

Bear in mind you have to support those butchumin sheets something ridiculous like every 400mm as they sag more than my Auntie mabels chest.

 

[upstairscharly]

Bear in mind you have to support those **** sheets something ridiculous like every 400mm as they sag more than my Auntie mabels chest.

I can second that. Not sure about the sheets though On a serious note they are awful & supporting them is a must. Have you already purchased them as we can suggest some better alternatives.

 

[Mw Roofline]

The spell check got me I spelt bitumin with a 'ch' after the bit!

 

[upstairscharly]

The spell check got me I spelt bitumin with a 'ch' after the bit!

Butchumin sounds like a meat shop

 

[Mw Roofline]

 

[engineeringteacher]

Bear in mind you have to support those butchumin sheets something ridiculous like every 400mm as they sag more than my Auntie mabels chest.

I hear you about the sagging. Has to be 500mm apart for 15 degree pitch. They are very light weight which for the span I thought would be needed (and cheapish). Will listen to anyother suggestions though. Thought about baching with board. really need the size of the wood needed to make trusses.

 

[engineeringteacher]

Bear in mind you have to support those **** sheets something ridiculous like every 400mm as they sag more than my Auntie mabels chest.

I can second that. Not sure about the sheets though On a serious note they are awful & supporting them is a must. Have you already purchased them as we can suggest some better alternatives.

No not purchased them yet as cant get info on thickness of trusses so not totally sure about what covering to use. open to suggestions though Would like to keep cost down which is a factor.

 

[upstairscharly]

Metal sheet cladding is pretty well priced. It's a lot harder wearing/looks nicer & fairly easy to fit. You also have good range of designs & colours. Not sure of a supplier in your area but it's worth googling a supplier & getting a price. They'll also be able to advise better than Wickes.

 

[Mw Roofline]

Why don't you have it done in 25mm clear polycarbonate sheets with 6 m timber supported glazing bars? Will be nice to have lots of light, our suppliers in Brum are dead cheap 0121 311 2666 they give free advice (Well it's my bro's firm hence the plug!) but mention me and you'll get it cheap and then I get free beers