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PostPosted: Mon Jul 02, 2018 11:32 am 
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Hi, looking for a bit of advice - I've done a 3m and a 4m extension before and used a standard pitched roof from the house - the pitch and the span was just within regulation for the 4m extension.

The question is now I'm planning a 5m extension on my new house - what would be the cheapest and easiest way to do this as obviously the span exceeds the maximum for timber joists.

Any help appreciated !


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PostPosted: Mon Jul 02, 2018 11:41 am 
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Tommo2482 wrote:
Hi, looking for a bit of advice - I've done a 3m and a 4m extension before and used a standard pitched roof from the house - the pitch and the span was just within regulation for the 4m extension.

The question is now I'm planning a 5m extension on my new house - what would be the cheapest and easiest way to do this as obviously the span exceeds the maximum for timber joists.

Any help appreciated !


Use larger timber - (roof timbers are rafters, joists are laid level for floors), I've used both joists and rafters in over 7m spans before now so the span is not a problem with the correct sized timber.

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PostPosted: Mon Jul 02, 2018 12:06 pm 
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Thanks for the advice, would I then need a steel purlin underneath ( the extension is 8m wide so timber won't do)?


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PostPosted: Mon Jul 02, 2018 12:14 pm 
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Can you not get trusses made from a truss manufacturing company? They are all engineered,made for you and light and easy to install.

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PostPosted: Mon Jul 02, 2018 12:51 pm 
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iirc the min pitch is 13º and a max of a 150mm head lap

what sort of tile ? cement, clay or slate ? BC with usually be ok with a minor spec change as long as you not in a conservation area

both Marley and Redland have the specs on there site most tiles are 15º or greater


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