patio roof help please

Hi All

Please help as I have been putting off the back patio for about two years now and the wife is starting to complain ....:( .
I have done alot of reseach and think i have got the right plan and spans ,roof load and and weight .I want the patio to be a continuation of the existing roof but do not want to loose any hight. So have come up with this plan.

Posts 3.2m 110x110 Lam merbau
Beam 6m 240x45 hyspan - span between posts 4.7m
Rafters A 3.6m 130x 36 hyspan at 1m centers
Rafters B 3.1m 120 x45 f7 h3 pine at 1m centers
Battens 6m 35x70 f7 h3 pine at 900 centers
Roof sheeting colourbond

The 130 hyspan rafters will rest on the external brick wall while the 120 rafters will be connected to the existing house rafters . The underside of the rafters will be lined with 10m gyprock at 500m centers .
Any advice would be greatly appriciated .
Image attached
thanks
rob j

Attached Thumbnails http://www.renovateforum.com/attachm...ease-patio.jpg



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