fence posts supporting carport roof?

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hi all
just a quick question as I cant find an answer through other posts..
I want to build a 6mts x 3.5mts carport with polycarbonate roof fitted onto joists with glazing bars along side of the house..im using c16 timber for roof framing. . just need to know if 4x4 treated fence posts are strong enough for the roof to sit on? or do they do c16 or structural post which
should be use to support the roof?

thanks
 
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yes, footrot will be a problem, I did something similar, but built concrete pads to 150mm above the paved level, with steel post shoes bolted to the pads. Some of the post shoes include a spacer to give an airgap between the bottom of the post and the shoe. If not, lay some stainless nuts to give a draining layer, and ensure any water that runs down the post into the socket can drain out.

Soak the bottom of every post in Cuprinol or similar spirit-based preservative before construction.
 
Should be fine last property I bought and renovated had exactly that, posts were fine been up 10 years and even if they rot a bit it does not collapse as it's secured to the building.A good overhand all round meant the posts rarely got wet.
 
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many thanks for the replies.. i was going to put the posts onto galvanised base anchors which will be concreted in place and bolted to the posts at the bottom as I think they are a good idea keeping the post away for ground level..i have used similar ones on low level decking where I put concrete pads in place and use bolt down types and rested the framing in them.. keeps the joist 25mm from the ground
just one more question.. has anyone used Paslode Quattro Shanks Exterior screws and recommend them for strength? was thinking of using them for framing..
 

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