attractive flat/shallow roofing options

browfish · 4 Oct 2010

I am planning an extension and roof adaptation. The extension will have 3no. flat roofs at different levells and the roof will have 2no. shallow pitched dormas

The question is, grand designs alway use all sorts of different roofing materials from rubber roofs to zinc/copper sheeting etc but cant seem to find any on the net now they are of interest. Anyone any suggestions?
thanks

Mw Roofline · 5 Oct 2010

You can get coloured fibreglass which looks great if applied perfectly to the roof

and you can get EPDM roofs which look nice if laid dead flat and smooth.

Fibreglass can crack in severe minus weather, epdm will never crack but its thin so a falling tile would most probably pierce the edpm where it could lightly crack the surface of fibreglass

^woody^ · 5 Oct 2010

If at the planning stage, make sure that your council will permit flat roofs at first floor level - many councils have policies which only permit flat roofs on ground floor extensions

browfish · 5 Oct 2010

Thanks for that. It isnt a flat roof at 1st floor level but a shallow pitch, around 14 deg. I didnt want to tile is and i wanted to keep it light, see pic below. The steeper sections either side will be tiled

Untitled

browfish
5 Oct 2010
1

freddiemercurystwin · 5 Oct 2010

Zinc is your friend, BTW you'll need SAP calcs and a structural engineer for all that glazing! I did a similar design a while back for a client.

Untitled

freddiemercurystwin
5 Oct 2010
1

Got about 3/4 way through the regs drawings when he pulled the job when he found his bank wouldn't increase his mortgage!

^woody^ · 5 Oct 2010

freddymercurystwin said:
Got about 3/4 way through the regs drawings when he pulled the job when he found his bank wouldn't increase his mortgage!

You must charge too much

freddiemercurystwin · 5 Oct 2010

^woody^ · 5 Oct 2010

Back on topic after me falling off my chair at FMT's fees ........ if the OP's roofs are to be flat, then I can't see any real value in having them metal clad, as they will not be seen, and not worth the high additional cost compared to EPDM or fibreglass

freddiemercurystwin · 5 Oct 2010

You can see them everytime you look out the windows though and its not just the roof top but the verge/gutters/downpipes etc that go with a metal roof. My client had all this in mind through the design process he was pretty clear that he thought the usual suspects (felt, edpm etc etc can look cheap. Each to their own.

browfish · 6 Oct 2010

I know i will need the saps done but the existing house is so badly insulated i dont think i will have an issue upgrading the performance of the rest of the house to offset the glazing. eg ther is no roof insulationa the moment and the boiler must be 30 years old by the looks of it.

I was thinking maybe zinc for the dorma roofs. How expensive is this?
Was also contemplating the possibility of a green roof to the flat roofs. These preform quite well thermally and would look ok from the 1st floor.

^woody^ · 6 Oct 2010

Do metal roofs and gutters still sound like stones rattling in a can when it rains?

TBH, I've not seen many metal roofs on domestic properties that look like they belong there. Most of the time, they tend to look like the owner has got s bargain second hand roof from somewhere and has just plonked it on for the sake of it

I like flat roofs, but as soon as a metal roof is pitched and visible it seems so wrong and out of place

freddiemercurystwin · 6 Oct 2010

Yes woody hates zinc roofs in case you hadn't gathered it!

I looked into the pricing when I did the drawings for that extension although not to hand asI'm not at home at the moment. I recall it wasn't that unreasonable compared to the usual (dreary) suspects. Try PMing //www.diynot.com/network/hardmetalking he seems to know his stuff.

Price indication here: //www.diynot.com/forums/viewtopic.php?p=1720490#1720490

flatroofer666 · 6 Oct 2010

high performance felts laid by experts is the way forward...warm roof void on top of 18mm good quality plywwod and your looking down the barrel of a 25-30 year roof....and i mean a propper flat roofer like myself who's been doing it in excess of 30 years

check out my gallery

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nickjb · 14 Oct 2010

We are building a similar low angle roof. Our current plan is to go for a green roof. We've looked at a couple of local properties that have them and they've looked great.

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attractive flat/shallow roofing options

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