Building a garage that’s not square?

A3Q · 23 Sep 2018

We’ve been in our place a year now and thinking of building a detached garage to the side of the house. There is plenty of room but we want the garage as large as possible and the problem is the boundary is at an angle?

I have 8.2m width available at the front and 6.8m at the back, length of 8.6m. External wall dimensions.

We also want to put a room above which with a 40 degree pitched roof should give a decent size room.

Foundations and walls at an angle are simple but is it possible to lay a dual pitched roof with this footprint? If so what are the best options moving forward? I have done slate and tiled roofs square, hipped and faceted before but not anything like this?

Edit: I should add ideally I want it gabled front and back which is why the roof is complicated.

Any help greatly appreciated.

noseall · 23 Sep 2018

Odd shaped footprint = flat roof. End of. Ether square things off or suck it up.

Notch7 · 23 Sep 2018

A3Q said:
We’ve been in our place a year now and thinking of building a detached garage to the side of the house. There is plenty of room but we want the garage as large as possible and the problem is the boundary is at an angle?

I have 8.2m width available at the front and 6.8m at the back, length of 8.6m. External wall dimensions.

We also want to put a room above which with a 40 degree pitched roof should give a decent size room.

Foundations and walls at an angle are simple but is it possible to lay a dual pitched roof with this footprint? If so what are the best options moving forward? I have done slate and tiled roofs square, hipped and faceted before but not anything like this?

Edit: I should add ideally I want it gabled front and back which is why the roof is complicated.

Any help greatly appreciated.

Im wondering how you could pitch a roof thats 1400mm wider at the front.

You could have the walls sloping, 550mm higher at narrow end, with a 40 deg pitch

I suppose you could have a tapered box gutter each side,

or differing soffit sizes.

Or change the pitch as roof goes along. But you will need bendy tiles.....

Or compromise and build 7.5m wide, step in half way to 6.8m and put step in roof, or no soffit at wider bit, bigger soffit on narrow bit.

Or build with double ridge, which almost touches at narrow end, and is wider apart at wide end, with flat on top. That might almost work since it wouldnt be possible to know what width the flat part is from the ground.

noseall · 24 Sep 2018

It would be a nightmare and a bodge from the get-go. I would no go near it unless they agreed to a flattie. It will look horrendous too. Why even bother.

Nozzle · 24 Sep 2018

I have a daft shaped garage (now ex-garage). You can have two pitched rooves, no problem. Hand-cut, obviously. Do your self a favour though, don't build right up to the boundary. mainly as don't want guttering hanging over it, but also it's handy to have a passge front to back to get mini-diggers through in future..

Nozzle

A3Q · 24 Sep 2018

Thanks for the replies

I’m thinking now I will have to put gables on each size pitch it front to back unfortunately. Then I could put a dormer in the back.

I have left a passage between house and garage and also we can get round the other side of the house too so that’s not a problem.

Notch7 · 24 Sep 2018

A3Q said:
Thanks for the replies

I’m thinking now I will have to put gables on each size pitch it front to back unfortunately. Then I could put a dormer in the back.

I have left a passage between house and garage and also we can get round the other side of the house too so that’s not a problem.

Yes, that's an option -hadn't thought of turning it around, that would just mean the verges wouldn't be parallel

noseall · 24 Sep 2018

If a roof gets narrower, as you travel from ridge down to eaves, means that the rain-water will run down the (gable) wall. You would need to mitigate this problem with a channel, cleverly built-in along the verge.

^woody^ · 24 Sep 2018

https://www.diynot.com/diy/threads/pitch-roof-advice-please-o.473810/#post-3802534

loply · 24 Sep 2018

We've just built a pitched roof garage which is not square - it's 7 meters long, but the depth on one end is 5m and on the other is 7m.

It means the fascia gets lower as it goes along the uneven side. No big deal.

^woody^ · 24 Sep 2018

loply said:
We've just built a pitched roof garage which is not square - it's 7 meters long, but the depth on one end is 5m and on the other is 7m.

It means the fascia gets lower as it goes along the uneven side. No big deal.

Loplysided?

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Building a garage that’s not square?

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