Replacing a flat roof

[beerboy]

My wife has very kindly volunteered me to replace my mother in laws flat roof. Last year one of her neighbours was doing some painting outside and it appears he damaged the roof (which I'm guessing was already rotten).
So my plan is to remove the existing felt and ply and replace in reverse order. I have a few questions and not having any trade discounts from builders merchant (Except a b and q card), I am also paying for the roof as she is a pensioner. Fortunately the roof is only 10M2.

1, what type of felt and adhesive should I be using.
2, Do I need to put more than one layer down.
3, Does modern felt need to be covered over with stone chipping.
Thanks James

 

[HERTS P&D]

Going by what you have written, I would say you are a pensioner (b&q card) with no/if any DIY experience.

Get 3 quotes from roofers or this could end in tears.

Andy

 

[beerboy]

Im 50 and an electrician. Also I've put a couple of flat roofs on garages 15 years ago, just need some advise from someone with knoledge.

 

[HERTS P&D]

OK, so you are young and a trade.

This is what I done to my double garage roof. Never tried it before but followed all of the videos and it came out very well. Watch them all, I think there are 5.:

Andy

 

[bernardgreen]

If it is a simple flat roof then consider using a membrane instead of felt. The materials are more expensive than felt and pitch but with no joins to seal with hot pitch the probality of sucess is far higher. Especially for a DIY project.

As for discounts at builders merchants. I have Cash Accounts with several, they were told it was for DIY work and none refused. Pay by cash or debit / credit card at time of purchase, Discounts are good.

 

[beerboy]

Thanks

 

[Notch7]

EPDM is easier than felt for a flat roof when DIY. Felt on a flat roof I would say is for professionals only.

GRP is an alternative, but if it is a simple rectangle, EPDM is straightforward.


EPDM is £9.00 per sq metre for the rubber, then you need some adhesive and trims:

https://www.rubber4roofs.co.uk/shop/classicbond-one-piece-epdm-rubber-roof-covering-1-20mm

 

[geraldthehamster]

EPDM gets my vote.

But before you do anything at all, you need to know the condition of the joists beneath the decking. If it's not just the board that's rotted, it could be a bigger job

 

[beerboy]

We're the waters come through the roof the ceilings plaster board has dropped out and fortunately the joists look ok from what I can inspect.

 

[geraldthehamster]

I am not a builder but have done two large flat roofs with EPDM, and found it a doddle. Do it well and it should last well over 50 years. Have a look at the "how to" videos here:

http://www.rubba-seal.co.uk/