max span for lean to garage roof

[ferguson1947]

wanting to build a new garage with lean to roof rather length will be 4.8m It will be adjoined to a neighbours house so I don't want any load on their house
I was thinking a rsj 6m long running the length of the garage supported on steel posts next to the neighbours house to support the rafters
it will be lightweight steel roof sheeting so would the rafters be better in steel or timber and any clue on sizes
the existing garage has 6x2 timbers and spaced at 1250mm but only 9ft wide

 

[PhilPrime]

For a span of 4.8 meters you are probably looking at 9x3 rafter that's working it out on a 400 mm spacing

 

[ferguson1947]

what size rsj and posts do people think and if I used steel rafters could I get away with 3 or 4 with timber purlins running length ways

 

[catlad]

You could bring your timber sizes down a bit by moving the supporting beam in a bit, and cantilevering the last meter or so with it being a light weight roof.