We had our slate roof re-membraned and re-slated (with new slates) Nov09. Since then we have had to have the roofer back about six times to repair a total of about ten slipped slates. After the latest cold spell last week I noticed two more have slipped and one has cracked in half. I will call the roofer tomorrow.
The roofer seems as disappointed as I am when I ring him up and he turns up resonably promptly to replace the damaged tiles. He questioned the supplier the last time who told him that it is because the roof is south facing!!!
I'm at the point now where I have no faith in the quality of the materials used. Does anyone have a suggestion as to my next course of action or has anyone experienced this problem themselves. I have emailed the NFRC but since the roofer was not a member I doubt there is little they can do.
Help and advice much appreciated,