The roofer hasn't come back yet but he said on the phone he is 99.9% sure it is something to do with the low pitch of the bottom row of tiles, and he'll think about how to fix that.
He mentioned that he might use some sealant to seal the gaps between the bottom row tiles and the row of tiles which are on top. He will do that for the width of the roof and hopefully it will work.
Would what he say work? Or there are better solutions for this problem? I am not as sure as he is, and would like some advices from you guys.
Thank you again for taking time to answer (The B&Q diy book is no use at all). Really appreciate your help!
Thanks alastair. Maybe he can use a layer of acrylic paint as well?
I am just worrying that the roofer is too fixated on the idea that the low pitched tiles are the cause of leak, and neglect other possibilities (like coping stone pointing).
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