Question Author
Builder,
I was going to address this to you in the first instance, as I knew you would enlighten us, but, let every one else have a go at the @ shingles@ i never knew what they were called until we found a pack in wickes. Right, the roof slopes sideways rather than from back to front, no puddles, always dry, wickes say shingles will last 20 years, these been down eight, and look new. I have found a few cracks between the flat roof and the pitches, which may be the cause. I can seal these in with mastic/ silicone before applying the sealant.
does that sound worthwhile ( I am thinking 50 quid, worth a shot) ?
Any advice always appreciated.