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I was wondering if it's worth the additional £280 to use triflex rather than torched felt on the flat roof area
It all depends on what guarantee is offered with the two systems. Torch on if installed properly is a cost effective way to do a flat roof that can be easily repaired down the line. The best roofer I know prefers torch on systems to GRP / EDPM, the latter has a longer life expectancy but this is unproven as they have not been widely available for as long as the claimed life expectancy so any claims are based on lab tests.
One thing I would say about the roof pictured is it has clearly been patched many times in the past. Take any quote you get with a pinch of salt, simply put it is impossible to know the condition of the roof structure under the tiles and felt until everything has been lifted. You may get lucky but I'd be surprised if you didn't have to do some form of repairs to the structure. Plan for the worst, hope for the best.
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Bobbo
no, that's the problem. we're looking to replace all the flat roof section, retile the tiled areas, new soakers and felt the concrete bit in the corner. I was wondering if it's worth the additional £280 to use triflex rather than torched felt on the flat roof area. Torched felt to my untrained eye looks a bit like the budget and shit option. Is that the case, or is it the go to option for this sort of thing? thanks very much