Shed roof sheeting

[massey 6480]

Was thinking non drip was a no go alright . What size timber would you need for 20ft spans would 7 x3 timbers do it .

Non drip won't work anywhere you have a heat source underneath. Might get away with it with a space heater in a workshop that's used intermittently but definitely not with cattle underneath.

Galvanised purlins haven't a thick enough coating of galv on them to deal with ammonia from cattle underneath them. They can be used if painted with correct paint.
I've seen galv purlins corroded badly in a shed that was only 4 years old but ventilation was bad in it too.

 

[Green Grass]

My neighbours shed 20 foot spans was done with gal. purlins 36 years ago and cement fibre ,3 on top had to replaced with the last few years .I have not seen it with a few years but surely more of them must be getting shook

 

[nashmach]

Was thinking non drip was a no go alright . What size timber would you need for 20ft spans would 7 x3 timbers do it .

I think youd need to go heavier to be honest.

Wouldn't be afraid of the newer purloins with the coating, it's well proven. And to be honest most timber these days is pure rubbish.

 

[eire23]

Got the bit of a shed was at here finished today. First time using .7, after seeing a good few on here reccomemd it. Some differenence between it and .55 to walk on, it's like night and day. Don't know will it last any longer but hopefully will.

 

[quiller]

Hi guys. I was asked to change a corrogated steel roof , about 44 sheets 18 foot long attached to steel gurder with hooks , with tegral sheeting and all side trims and ridge. Just wondering would anyone know approx cost of labour for something like this? Prob use tec screws for something like this? Sorry guys new to this forum.

 

[scoffcruddle]

Was thinking non drip was a no go alright . What size timber would you need for 20ft spans would 7 x3 timbers do it .

You need good dry 9x3s for 20’ bays,I buy them and let them dry before I put them up.