leaking flat concrete roof

doggles · 14 Sep 2013 at 17:31

so I wonder has any one got any experience in using

ACRYPOL or isoflex liquid rubber as a sealer for a flat roof?

I'm finding it hard to choose between the two,

Brozart · 14 Sep 2013 at 17:51

Flexacryl Roof Repair Compound and Isoflex Liquid Rubber is very good, personally I would only rely on this as a temporary fix to get you through the winter, save up for something that will last such as a EPDM Rubber Membrane.

Nightglow · 14 Sep 2013 at 17:56

Acrypol & Isoflex are only a temporary fixes, ideally you need a complete new roof covering.

But, Isoflex is better in my opinion.

The concrete roof on my workshop sprung another leak last month, the felt was beyond repair, I had it replaced with fiberglass roofing.
And the front bay window concrete roof also had a leak, solved that with a tin of liquid roofing which had fibreglass strands in it, but the name eludes me at the moment.

doggles · 14 Sep 2013 at 17:57

it's only for a 3x3 m utility rm. so although I considered epdm I presumed it would cost a lot.

Nightglow · 14 Sep 2013 at 18:15

You can buy a 10mtr square fibreglass roofing kit for about £120, maybe less if you shop around.

I did consider epdm, very good product,but the rough condition of my concrete roof, I decided on fibreglass was better.

doggles · 14 Sep 2013 at 18:22

did you just lay the fibre glass straight on it or put down plyboard to it first?

Lopéz · 14 Sep 2013 at 18:24

Nightglow said:
And the front bay window concrete roof also had a leak, solved that with a tin of liquid roofing which had fibreglass strands in it, but the name eludes me at the moment.

Sounds like Flexacryl - I used it to seal a leaky garage roof a few years ago, did a very good job too.

Brozart · 14 Sep 2013 at 18:31

doggles said:
it's only for a 3x3 m utility rm. so although I considered epdm I presumed it would cost a lot.

Its pretty good value and if you didn't want to do it yourself, some roofers actually offer a lifetime guarantee. Here is a full EPDM roofing kit on the bay:

http://www.ebay.co.uk/itm/EPDM-Roof...t=LH_DefaultDomain_3&var=&hash=item2c701e3072

doggles · 14 Sep 2013 at 18:36

Brozart said:
Its pretty good value and if you didn't want to do it yourself, some roofers actually offer a lifetime guarantee. Here is a full EPDM roofing kit on the bay:

http://www.ebay.co.uk/itm/EPDM-Roof...t=LH_DefaultDomain_3&var=&hash=item2c701e3072

thanks! do you think it could be laid direct to the concrete slab, or wiser to lay some plywood first then rubber on top ?

Brozart · 14 Sep 2013 at 19:40

doggles said:
thanks! do you think it could be laid direct to the concrete slab, or wiser to lay some plywood first then rubber on top ?

Yeah the bonding adhesive works with wood, concrete, and metal. Just make sure the area is clear of debris and smooth so that the adhesive can bond to the rubber properly.

bitslice · 14 Sep 2013 at 19:57

Thanks Brozart, I hadn't previously considered EPDM as I assumed it was too expensive, but that isn't bad.

How would you go about sealing this to an existing brick wall?

Jakeee · 14 Sep 2013 at 20:50

bitslice said:
Thanks Brozart, I hadn't previously considered EPDM as I assumed it was too expensive, but that isn't bad.

How would you go about sealing this to an existing brick wall?

This is a good trim with an effective drip edge:

http://www.ebay.co.uk/itm/2-Part-Gu...Ceilings_Walls_Roofing_ET&hash=item2c727f16c3

doggles · 14 Sep 2013 at 22:04

ahh my flat roofs a bit bobbly so maybe a plywood sheet first would be best

Nightglow · 15 Sep 2013 at 10:56

doggles said:
ahh my flat roofs a bit bobbly so maybe a plywood sheet first would be best

Same here, I just used my grinder to take off the high spots first, no need to use ply.

Unlikely it would have been a issue using fibre glass, as us you can work in the matting, but I prefer not to find out the hard way, & having problems later.

ANDARIAL · 15 Sep 2013 at 11:20

Another vote for fibreglass