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What type of roof shall I have on my house extension?
What type of roof shall I have on my house extension?
I’m at this stage of building my extension 3.8×7.3m.
I can’t make my mind up on what roof to have.
From the start I’ve have a parapet wall and warm flat roof with a lantern in my head but I’m a little concerned I won’t see the garden over the parapet.
The build up of the roof is around 450mm so converned about a large facia hence the parapet
If anyone has any pics of similar extensions it would be nice to see what others have done.
going to fit a set of bifolds or slider on the back so also keen to hear opinions on these. Can’t decide on the colour either
Existing brickwork will be rendered or glad
TIA
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16 Replies
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As it what material ? I’d go flat with rubber and sky lantern
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pitched or flat.
Almost defo going with a warm flat roof just a little concerned about the thickness of it
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Thought that would have been planned first before the build
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Flat warm roof.
If you want a long life roof and potential to use the area as a balcony I recommend a proper warm roof with an asphalt covering.
You can fix promenade tiles to the asphalt so can be walked on or deckchairs on it.
If you have a parapet wall all round make sure you go for a chute through the wall outlet and not a pipe outlet.
Done properly will last a good 30 years plus.
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Fibreglass if you are having a lantern. Rubber is great but,if it can be seen from the 1st floor, it isn’t the best looking around the upstands.
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What does it say on your plans? I. E. What’s been approved?
If you haven’t got PP you’re doing it under Permitted Development then you’re only allowed to build over 50% of width of the original building so from the pictures, you’d have a problem.
Don’t listen to the idiot who said ignore planning and build a balcony anyway. That’s strictly forbidden unless you’ve got PP for it.
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I would do a warm roof with fibreglass covering. No parapet
I would fit smaller fascia’s though. I feel heavy fascia’s look like the builder arsed it up.
The roof depth is sat on the inner leaf, so the outer leaf can be built up to allow for smaller fascia’s
Good luck
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As an architect there are a few v good comments here and some silly ones you always see….
Flat roof … parapet sides and maybe facia the front but never looks like the wow factor .. I parapet all three sides of mine and went flat glass to reduce height and Also you can be clever and use 100 kingspan to top of firings and plastic membrane and then 12mm ply, then plastic membrane and 100 kingspan and then 18mm osb … it’s a hybrid roof and our building control allows it so longs as no trapped air… causing moisture!
You can cut the roof joists down to 4×2 over the cavity and outer skin and reduce facia but go for the parapet and do a lovely indented course … will look awesome … good luck
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Personally, I would put steel beams in, in readiness for extending a dormer over the extension. It would be less invasive the second time around.
Just a bit of future proofing.
Id stay away from any roof lights.
People pay a premium to have them installed, then struggle for years to block out the light again. .
All my neighbours are balling with this.
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Warm flat roof with lantern
If done correctly then the facias will not be oversized
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Flat parapet roof 100%. Min fall towards your bi folds. Glass fibre roof with x2 rain outlets. Render if budget tight. Clad if after something with a certain style. Glad in metal if you have the budget! Wow! Prob won’t see the garden too much from roof above if that’s your concern. As othershave commented balcony would be ideal! Engineering cals would be needed (possibly flitch beams) in middle tied into the galv steel above your bi folds to take the load. Deffo anthracite or black bi folds.
Rooflight? Always a nice feature
Your concern shouldn’t be about not seeing the garden! You live in the space below, worry about that more. (Hence glass fibre roof) more pleasing to the eye than felt!
If budget allows. Metal parapet copings! decide on external finish before you but the final size of these due to varying build up depths on walls
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Doesn’t have to be a large fascia,with build up with a flat roof,if you’re builder knows what he’s doing.
Extend the joists past wall plate to outer leaf of bricks,cutting joist height down to 150mm at bricks,run brick courses higher to meet bottom of joists,then you’ll be left with 150mm fascia,we do this all the time
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This is warm roof I done a couple of years ago. Total fascia depth 250mm. This one had an integral gutter so no gutter on show on the outside. Just depends on how good your joiner is.
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Tidy brickwork must say coming from a Briki warm deck with big sky light parapet with nice cream coping stones all day long
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It will have to be a flat roof the projection is to much for a lean too. You would only get around 12 degree angle. At that angle it doesn’t look great
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Stick a gable hip and then 3 large veluxes each side lovley and the degree roof lets you see below keep cielings vaulted nice amd high stick a cranked steel to cary it thank me later
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