Calculating Volume Of A Hipped Roof Extension
Discussion
Hi,
It's been a while since I was at school and the online calculators don't seem to cover this scenario.
Planners want a volume trade off
I'm building a first floor extension over the railings - even I can remember how to calc the room volume but for the roof:
Effectively I've laying a triangle over at 45% x the width of the room
1/2 base x height x depth
Height = END HIP length measured down the hipped end (as I'm laying it over hence it's NOT the loft height)
Depth = room width
Base = room length
Is the above correct ?
It's been a while since I was at school and the online calculators don't seem to cover this scenario.
Planners want a volume trade off
I'm building a first floor extension over the railings - even I can remember how to calc the room volume but for the roof:
Effectively I've laying a triangle over at 45% x the width of the room
1/2 base x height x depth
Height = END HIP length measured down the hipped end (as I'm laying it over hence it's NOT the loft height)
Depth = room width
Base = room length
Is the above correct ?
I'm rubbish at maths so can't answer your query However there's a useful volume calculator on the planning portal - www.planningportal.gov.uk that might help you. It's under the 'useful tools' tab.
Escort3500 said:
I'm rubbish at maths so can't answer your query However there's a useful volume calculator on the planning portal - www.planningportal.gov.uk that might help you. It's under the 'useful tools' tab.
Thanks, I'd found that and it is handy - just doesn't cover my type.Not sure what you mean?
The new roof will have a slanted end that matches the slanted end of the house it butts up against? So from the side elevation in your photo it will look like a pushed over rectangle (a parallelogram). If this is the case and the cross section triangular, then the slanted (hipped) ends will be identical and so you can treat it as a triangular prism the full length of the railings bit. You need the vertical height of the triangle, not the length down the sloping hipped bit. Then it's 0.5 x width x height x length and you can ignore the hips as long as they are identical.
The new roof will have a slanted end that matches the slanted end of the house it butts up against? So from the side elevation in your photo it will look like a pushed over rectangle (a parallelogram). If this is the case and the cross section triangular, then the slanted (hipped) ends will be identical and so you can treat it as a triangular prism the full length of the railings bit. You need the vertical height of the triangle, not the length down the sloping hipped bit. Then it's 0.5 x width x height x length and you can ignore the hips as long as they are identical.
Shaolin said:
Not sure what you mean?
The new roof will have a slanted end that matches the slanted end of the house it butts up against?
So from the side elevation in your photo it will look like a pushed over rectangle (a parallelogram). If this is the case and the cross section triangular, then the slanted (hipped) ends will be identical and
so you can treat it as a triangular prism the full length of the railings bit.
You need the vertical height of the triangle, not the length down the sloping hipped bit. Then it's 0.5 x width x height x length and you can ignore the hips as long as they are identical.
YesThe new roof will have a slanted end that matches the slanted end of the house it butts up against?
So from the side elevation in your photo it will look like a pushed over rectangle (a parallelogram). If this is the case and the cross section triangular, then the slanted (hipped) ends will be identical and
so you can treat it as a triangular prism the full length of the railings bit.
You need the vertical height of the triangle, not the length down the sloping hipped bit. Then it's 0.5 x width x height x length and you can ignore the hips as long as they are identical.
Thanks.
Yes that's what I thought (in my second post)
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