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Oy! Anyone got an extension with a flat roof? Come and talk to me!

(37 Posts)
Dolphinnoises Fri 03-Jan-14 20:13:37

Yes, I know I know it's duuulllllll....

But we need some more space and the architect says it's got to have a flat roof for all sorts of boring reasons. I really didn't want one - I'm imagining drumming rain and leaks and no-one wanting to buy it if we decide to sell, and insurance companies refusing to insure us.

Does anyone out there know better? Yes I know I should have posted in Mumsnetters With Extension questions or similar, but it's a bit niche and I think I'll need the traffic.

TwinkleSparkleBling Fri 03-Jan-14 20:50:52

DH works for a flat roofing company. They do a 25 year guarantee, I don't know the ins and outs but he sells lots and never has any complaints grin. I think they re do old ones with some sort of "magic" cover.

I'll ask him for info in a mo..........

LaundryFairy Fri 03-Jan-14 20:51:09

We're planning a flat roof, but a green one planted with sedum to make it more interesting, cut down on the sound of rain falling, and reduce water run off. Hope to do it later this year (money permitting).

MissBeehiving Fri 03-Jan-14 21:02:34

This is my sloping flat roof because it's planted then there is no sound and it looks great. We sit on it in the summer grin. Never had any problems with noise or leaks.

TwinkleSparkleBling Fri 03-Jan-14 21:03:32


Twinkle's DH here.

I work for a flat roofing company. So declaring an interest from the off - however I don't know where you are based so not touting for business.

Firstly there is nothing wrong inherently with a flat roof per-se - it's what we have traditionally covered them with that is the problem.

You do need some sort of pitch even on a "flat" roof - a minimum of 1 in 80 but I would recommend 1 in 60 as better. Also make sure the architect takes the water from the property away to the edge of the roof, and not as I've seen before, from the edge of the roof back to the main building and then out through internal drains and all sorts - just bad practice.

Felt, has typically a lifespan of 7-10 years, slightly longer if covered in chippings. People ignore their roofs until they leak - which is about 2 years too late! Also, walking on it causes it to crack quicker.

There are however a range of products on the market now that have significantly longer lifespans. The product we use is called "Rubberbond" - it is an EPDM elastomeric single ply membrane with a fleece reinforcement layer. In a nutshell, fit this roof and you will NEVER have to re-cover it. The first roofs were done in 1962 in the US and no roof has ever had to be recovered (ok, sounding like a sales pitch over).

We give 25 year guarantee on it - most other installers will give 20-25 on it as well.

Do not confuse it with Firestone - which is a simple EPDM - it's cheaper, but no-where near as strong and won't last as long.

Insurance companies know about it, and whilst you still have to declare if you have an area of flat roof, once you tell them it's Rubberbond you'll be fine.

Do NOT fit fibreglass whatever you do. It's brittle, and whilst very strong, it has a tendency to crack.

There are also liquid coatings available - some better than others so do your research carefully on these.

Needless to say, Rubberbond isn't cheap - typically on a new-build it will cost 10-20% more than felt or fibreglass, but given the lifespan benefit it's well worth the extra.

Hope that helps, but for more info please PM DW.

TwinkleSparkleBling Fri 03-Jan-14 21:04:49

Sorry if that was too epic blush as you can imagine DH is truly riveting at parties!

FryOneFatManic Fri 03-Jan-14 21:09:16

Hey, Twinkle, don't worry grin As a flat roof owner I did find it a bit interesting grin

Dolphinnoises Fri 03-Jan-14 21:12:56

No he's great I slightly love him now - thank you very much indeed, I'm going to print all that out so I don't lose it thanks

MissBeehiving - your house is amazing!

PharaohQueen Fri 03-Jan-14 21:14:57

What a shame this is in Chat, can you get it moved so this information can stay?

Dolphinnoises Fri 03-Jan-14 21:16:33

I'll ask, Pharoah - you're right. I sort of imagined loads of tumbleweeds floating past and look at it all! Bless you all thanks

NearTheWindmill Fri 03-Jan-14 21:21:51

Twinkle's DH has said what the roofers said I think. It's great.

AbeerNaseer Fri 18-Apr-14 16:39:59

Message deleted by MNHQ. Here's a link to our Talk Guidelines.

Contemporaryrooflights Fri 19-Feb-16 09:17:18

Message deleted by MNHQ. Here's a link to our Talk Guidelines.

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