Off centre apex

[pgtips]

Hi
Seeking advice. I have a carport and garage to roof. The middle block pier is off centre but I would like the apex central.

If I use flitch beams I can support the middle upright but then I have to have lots of rafters, 6m deep spaced 0.5m between the rafters.

But is an off-centre support ok ?
No weight above, just rafters, OSB and metal sheets.

Like this..

Then no rafters.

It looks odd but I wonder if there's a reason it wouldn't work?
Thank you

 

[noseall]

Hi
Seeking advice. I have a carport and garage to roof. The middle block pier is off centre but I would like the apex central.

If I use flitch beams I can support the middle upright but then I have to have lots of rafters, 6m deep spaced 0.5m between the rafters.

But is an off-centre support ok ?
No weight above, just rafters, OSB and metal sheets.

Like this..
View attachment 426163
Then no rafters.

It looks odd but I wonder if there's a reason it wouldn't work?
Thank you

What's wrong with supporting the rafters (or a proprietary truss) at the ends?

 

[pgtips]

There isn't anything to support it, it's a low roof no more than 650/700mm high covered in feather board. The pier is off centre

So the apex sits appx 0.5m right of the LHS pier. Far right will be 4 upright posts for the carport side.

 

[noseall]

There isn't anything to support it, it's a low roof no more than 650/700mm high covered in feather board. The pier is off centre
View attachment 426252
So the apex sits appx 0.5m right of the LHS pier. Far right will be 4 upright posts for the carport side.

Get a truss roof company to price you something up.

 

[pgtips]

I have, off to see them on Monday next week but in the meantime I did some calculations and if I can live with a slightly offcentre apex then my middle wall takes all the problems away. Outward pressure on the outer gone.
Its boiled down to 'life is too short'. live with it being off centre.

So by having 0.4m off centre my middle wall can take the load with knee braces to shorten the rafter span. If I have an upright every 0.5 supporting the ridge board it makes everything easy.

A visit to the truss company might show me something I have missed and I may stick with that route of getting them made but I have options now. Its so low (650mm height) .
Thank you for your rely though, you are helpful.

 

[big-all]

no expert at all but triangulation is the key to stop the weight pivoting on a joint
in your situation the load is transfered from the rhs via the ridge to the lhs so as the load increases on the rhs it will try an drag the ridge down
i would suggest a timber from the lhs just below the 2 timbers across level to the rhs and connected to the centre support would stop the the load trying to spread
but as i say no expert