Extension pitched roof

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lynchnigel

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Hi all, we are planning on adding a pitched roof to an extension we want to build with Marley concrete tiles on it and two roof lights in it.

The total span will be about 5.5 metres.
31 degrees pitch.
Which leaves the rafters length at 3430mm and the rise 1646mm

What I wanted to ask is if we could away with no purlins and to plasterboard directly under the rafters.
Any alternatives?

Any help appreciated thanks in advance
 
lynchnigel said:
What I wanted to ask is if we could away with no purlins and to plasterboard directly under the rafters
Click to expand...

I'm guessing you mean a mono pitch with one end against the house.

I don't see why not, just need some beefy common rafters, maybe closer spacing.
 
lynchnigel said:
No sorry a full pitched roof
Click to expand...
With a double pitch you need a structural ridge which is usually a steel with a timber plate stuck on top to nail the rafters to.

If it's hipped then you need a cranked steel.

You need a structural engineer to specify
 
Thanks very much chaps for your opinions, it's not hipped no, just a garble end with bifold doors under it.
Sounding like an engineer then if we want no joists.
Sounding expensive so probably stick with ceiling joists.
For the span (5.5m) would we still need an engineer do we think if we had a full pitched roof
 
Not prohibitively expensive to employ an engineer, I paid £135+VAT for the the ridge design on this one.

Screenshot_2021-04-09-02-58-29-73_f541918c7893c52dbd1ee5d319333948.jpg


Screenshot_2021-04-09-02-57-30-83_f541918c7893c52dbd1ee5d319333948~2.jpg
 
Yes, that's pretty good, that might be the way to go, at least I will have the detail required to move forward.
 
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