Concrete flat roof

[goodallneil]

Hi all
Advise please
Part of our house has a solid flat concrete roof, originally this was the old coal store.
House was built in 1953, said old coal store is single brick with the concrete slab on top of the brick work
At some point (most probably previous owners) have extended the kitchen into the old coal store
The covering on the concrete roof was felt, this failed. I paid a roofer to install a rubber roof some 7 years ago. Sadly this failed last week, quite spectacular with the rubber peeling away from the concrete slab.
On inspection it appears the adhesive has failed. As a desperate measure I've scrapped off as much adhesive off the concrete slab, swept and cleaned any debris away and rollered on Acrypol rubber paint (I'm not sure how well this will work)
My dilemma now is what to do going forward. Pitched roof or batten off the slab, osb3 and new rubber coating?
Thank you for any or all advise and for reading my quite lengthy post
Neil

 

[LatinaRose]

Hi sorry no advice but following as I have a similar problem, only mine is a walkable "roof" terrace.
I have been doing some research and (hoping for someone with knowledge to confirm this) fibre glass seems to work as waterproofing when put into cement??

 

[Dereekoo]

Hi sorry no advice but following as I have a similar problem, only mine is a walkable "roof" terrace.
I have been doing some research and (hoping for someone with knowledge to confirm this) fibre glass seems to work as waterproofing when put into cement??

Whilst putting fibres in is a way of reducing/preventing cracking of mortar/concrete thus reducing risk of water penetration it is not a water proofing membrane in its own right.
As for the existing concrete roof I am somewhat surprised that the rubber roof failed and assume it was just a bad job. My concrete garage roof of plus 35 years has a felt covering with a layer of stone chippings laid on top and I have had no leakage issues, then again it maybe the concrete is of good quality built to a water retaining/excluding standard which until it leaks or I demolish it I will never know
..

 

[forcewashingwa]

If you decide to stick with a flat roof, proper installation and high-quality materials are crucial to avoid recurring problems. Consider consulting with a specialist for a detailed inspection to ensure the long-term success of whichever route you choose. Good luck!