Purlin spacing

[euroliner]

Putting up a new shed, 20 m span 6 m bays 18 degree pitch and using 0.7mm Plastisol sheeting, going with 175x65x1.6mm purlins, what's the max spacing between purlins?

 

[HatsOff]

Best to ask the Plastisol manufacturer/supplier.

It might need closer spacing at the eaves and ridges, and be dependent on where you are in the country (snow and wind conditions).

Edit - also, it will depends on the purlin strength too. Too far apart and each purlin will be working too hard.

Edit 2 - quick google and it is the purlins that control it. They are quite small for a 6m span. Depends whether you have them single or double/multi-span but you'll need them close together. Nothing more than 1.2m I'd say. Best check with the shed designer though.

 

[deere 6600]

3. Feet ….?…????

 

[euroliner]

All ours at least 1500 spacing but I seen one yesterday at 1800

 

[designanddetail]

Ask the purlin suppliers, 1800mm is the norm on an industrial shed with a composite roof but they are usually 8m span and 202 or 232 deep. The suppliers should have software to check the design.

 

[Kidds]

I trawled the internet for the same answer fairly recently and 1 metre was the answer I got.

EDIT: I was referring to .7mm corrugated/box profile tin.

 

[Skintagain]

Ones at my work composite roof will be 1500mm ish. But they are a lot deeper than 175

 

[dave mountain]

4ft 6 for 0.7 plastisol