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Discussion in 'Buildings & Infrastructure' started by grass man, Mar 12, 2019.
What size timber is required for a fibre cement roof on 6 meter bays?
Nine by three
9'' x 3''
And put 4ft of angle on the rafters as a cleat to reduce unsupported span to 16ft.
12x3 if you dont want them sagging
Trouble is the heavier section you go to overcome sagging, the wet timber and the extra weight defeat you. 6m is too wide for today's timber.
Crap timber is the problem, and I dont know where to buy good. Only answer is to have a good relationship with local sawmill that will allow you to pick them out.
Better to go with 15' bays
chap I get my seds fromsays it as cheap now to use steel , and they come ready drilled and are straight
I don't like steel for a livestock building
we have one thats forty years old with steel thats ok so far and the new ones are better, but I get your point
I don't want to admit it, but I've done a couple of cattle buildings in 10' bays.
Total volume of timber was the same, but we cut all the (4x2) purlins from the co-product when cutting posts and rafters, so used less logs and had less waste.
Hardly dedicated a log to purlins.
To avoid using too many posts (construction was raised feed passage through middle) we sat rafters on gurt 20' beams running lengthways.
I have a shed ordered with 20 ft bays, 9×3 timbers and box profile anti condensation non drip cladding. It's a general purpose machinery shed / workshop. My shed erector now suggested that the last few sheds he put up with that cladding do not please him. He says where the sheets overlap there is a raised lip because the fleece pushes it up and also the fleece runs right to the end of the sheet and over the spouting and he thinks that if it splashes up from the spouting that it may get absorbed back up the underside of the cladding a little. This is the reason for the original question. Any advice or opinions?
Tell your shed builder that he needs to scorch the end 3 inches of the top sheet at the lap and at the eaves to stop this happening.
Cancel shed and go for 15' bays with cement fibre roof nice and quiet on a rainy day
My shed builder and supplier are different people. I want to stick with 20 ft bays because the doors are in the side and I want side doors. How do you scorch, is this during the manufacturing or erection? Tia
If it's a workshop go for insulated sheets.
On site before erection, basically burn the fleece off with a blow torch or similar. Simple and very common technique.
9x3 on the shed I put up last year and no sagging yet I guess it depends on the quailty of the timber too
A lot depends on the erectors bothering to sort the timbers, and turn them so they bow the correct way, not just chucking them on without a care.