Timber sizes for a Small Lean To

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Hi I am looking at building a small lean to with single sheet corrugated plastic sheet. The depth of the Lean to will be a max 2.4 M, Length would be approximately 4.6M, height approx. 2.6M
One long side is to be fixed to the house. The other log side I am planning on supporting on 4" x 4" timber posts fixed at the base to concrete, with a 4" x 2" timber spanning these notched in place. The Wall plate I was going to be a 4" x 2" timber. The roof rafters I was thinking about 3" x 2" timbers @ 600m centres supported via joist hangers either end.

Being a total novice at this I was hoping someone could help with confirming if the above sounds ok or which if any needs different sizes.

Thanks for your help.

Neil
 
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The wall plate 4x2

How many 4x4 posts are you doing? 2 or 3

Roof rafters might get away with 4x2 without sagging, but not 3x2
 
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Hi I'm actually thinking of using 3 off 4x4 tanalised rough sawn and yes a 4 x 2 wall plate. I was then going to build a framework with 2 x 2 timbers to infill the ends
 
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Then yes 4x2 should be ok across the posts.

2" timbers fine, also use the 2" for your battens
 
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I would put some 4x1" timber across the rafters to strengthen it up and give you a lot more fixing points as those sheets are prone to blowing out, say 5 lengths.
 
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Ok that's great thankyou for all your help, Im sure there will be more questions in the future
 
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Sorry further question, would you use joist hangers for the roof rafters in this situation
 
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No just screw it.

For the wall plate I'd notch it at your required intervals
 
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