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Property/DIY

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Flat vs pitched roof

4 replies

FranklinTheCat · 13/04/2019 21:57

We are planning a rear single storey extension to our house, to accommodate a new kitchen, with some reconfiguring of the existing downstairs to incorporate a loo and utility. Sounds simple, no? Except our architect, who seemed great at the start, is now becoming rather difficult.

Basically, it's a 30s semi with hip roof. We are keen that whatever we do be vaguely complementary in relation to the original structure. We do not want to simply whack a box on the back - not dissing that style of extension, it's just not what we want.

The one thing we have been adamant about is that we didn't want a flat roof. Architect has now sent through various roof options to look at and most are either fully flat or partially flat roofs. Architect says we can't have a standard simple pitched roof because the extension is too big (c 4 X 5.5 metres). But our neighbours have a similarly sized extension which has a pitched roof...

I am at the stage where I am finding it very difficult to work out whether something is not an option, eg for technical/building regs reasons, or whether it is simply that the architect prefers a different kind of design. This is not the first issue we've had in terms of planning the extension and the architect has been rather evasive, to my mind, as to whether something is feasible.

Has anyone here built a simple single storey with a pitched roof (any design) of similar dimension? Does anyone have a partial flat roof which they are happy with? Are there technical reasons for needing a flat roof on some extensions?, eg gradient of pitch?

OP posts:
Broselug · 13/04/2019 22:47

Most of the time the restriction on an extension roof will be the impact on existing windows. Will a pitched roof block windows at first floor level? Or will
It doesn't sound like something that your architect couldn't explain easily though?

FranklinTheCat · 13/04/2019 23:53

@Broselug, thank you - that makes sense, especially when I think about the structure of the roof on next door's extension.

Yes, it should be something our architect could explain easily, shouldn't it? Unfortunately, we are having some communication issues with him and are finding it difficult to nail down whether certain things are not technically possible/compatible with building regs, or whether he simply doesn't like the idea, and it has proved rather difficult to get straight answers to straight questions. Hence asking for other people's experiences!

OP posts:
Broselug · 14/04/2019 00:43

No problem. If you can attach an image of the house elevations it would be easier to advise.

madameweasel · 14/04/2019 09:57

I would guess that the gradient of the pitch is too shallow. You shouldn't have a gradient of less than 15 degrees as most roof tiles won't allow sufficient water run-off from a shallow pitched roof. We had loads of trouble with a shallow pitched roof built by the previous owners of our house.

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