The brick parapet wall is solid construction but the flat roof is built on timber and will settle over time, the asphalt will melt in the summer and go brittle in the winter, with the thermal movement the cracking occurs.
So after cleaning of the roof taped patches are applied to the cracks before the new roofing system is installed to the roof.
On this roof we are using the GacoRoof a silicon-based liquid roofing materials from the USA . GacoRoof is very flexible and can withstand the movement described above.
The other interesting factor to all of this is the color of the finished roofing materials GacoRoof has a white finish and reflects the sun’s heat stopping the old roof from melting
The words Liquid Rubber are what most people perceive liquid roofing products to be, realistically out of the 15 or so liquid roofing materials on the market there is only one Liquid Rubber liquid roofing material that I know is actually liquid EPDM rubber, all the rest are liquid emulsion liquid polymers, or some other kind of material.
We are using 3M Scotchkote Urethane Roof Coating. SD650 is a two component, elastomeric, solvent-based urethane for flat roofs and its good, very good! Exactly what you would expect from 3M. It comes with a 25 year guarantee from 3M, when installed by a trained contractor, and yes, we are trained contractors. So if you need any info on the system please don’t hesitate to contact me: Steven Dickinson 07802 300 099 at London Flat Roofing Ltd.
Camden Kensington Hammersmith Highgate Holborn Belsize Park Bloomsbury Camden Town Chalk Farm Covent Garden (also partly in Westminster) Dartmouth Park Fitzrovia Fortune Green Frognal Gospel Oak Hampstead Haverstock Highgate (also partly in the London Borough of Islington and the London Borough of Haringey) Holborn Kentish Town Kings Cross Peckwater Estate Primrose Hill Regent’s Park Estate Saffron Hill St. Giles St Pancras Somers Town South Hampstead Swiss Cottage Tufnell Park West End of London West Hampstead St Johns Wood
I’ve looked at the photos of the flat roofs you sent me. Both flat roofs will have to have hand rails around them before any work can be carried out. Realistically a working platform would be the best option, around 500mm down from the ridge, as the ridge tiles will have to be removed so that the flat roofing material can be dressed up and over the top of the ridge.
Both flat roofs will need to be cleaned then overlaid with OSB board before the new flat roofing EPDM Rubber can be installed. An alternative material that could be used is the 3M Scotchkote Urethane Roof Coating SD650. This is a two component, elastomeric, solvent-based urethane for flat roofs and is very light in colour so it reflects the heat of the day in the summer. If you are not going to insulate the roof then this is the best option. It goes directly over the old asphalt, with no need to lay the OSB, so the saving there covers the cost of the slightly more expensive system.
Have a look at just how good the SD650 new flat roofing system from 3M is:
We have laid the SD650 around tanks and a skylight on the flat. You can see that it’s quite easy to apply in difficult areas unlike some roofing products. Just think that before we started using asphalt in the UK we were covering flat roofs in sheet lead. OK in the good old days we didn’t have many holes in the roof as we didn’t have the plumbing we do now, but still dressing around pipes and protrusions with a sheet product is not easy. EPDM rubber is good, but to get it to sit and dress correctly around some of the areas on this roof would have been difficult and unsightly. The new SD650 roofing system from 3M is designed to go over old flat roof coverings such as felt, asphalt, lead and so on. Being a liquid applied product it lends itself to difficult roofs such as the one in my video.
If you need any more information regarding the 3M SD650 flat roofing system or any flat roofing projects, please don’t hesitate to contact me:
I spoke to you on the phone yesterday about the front balcony to my flat. I have attached the photos of the terrace. You can see the large crack and I have tried to get photos showing how close the asphalt is to the door sills. If you look at the balcony next door it has been fully repaired and this is what I was thinking of having done. I would be interested in your suggestions and the various costs of the options available to me.
I went and looked at this roof today; the new customer wants EPDM placed over this old asphalt roof and he wants insulation to the new building regulations part L.
By placing insulation over the roof we will stop water from draining from the roof next to this one. If you look in the background the other flat roof is holding water – we refer to this a puddling. Puddling on a new rubber EPDM roof is not so much of a problem because EPDM is completely impervious to water. On an old asphalt roof or an old mineral felt roof, laid in three layers, sometimes referred to as (Green Mineral Felt roof), water puddling is a problem. Water penetrates into the surface via a tiny crack then freezes, blowing the crack further and further apart, then water can get through, resulting in a roof leak.