our roof was treated by Weatherguard and on 4th June 2010 we received a 25 year guarantee.
the work and guarantee cover against 'flaking, peeling, discoloration,moss and growth.
approx a year after the work was done we received a letter telling us that the company had changed owners and the guarantee was no longer valid. we were given an option to pay £35 to retain the guarantee with the new owners. we decided not to take this up.
now the roof is showing signs of a moss regrowth and the pointing between the ridge tiles has come away in many places revealing the old white mortar beneath.
when the work was done they made considerable mess in the attic with debris falling in as a result of the work.
the product used to treat the roof is made in Denmark and according to the websight it carries a 5 year guarantee.
i have written to Weatherguard and to Isonit Nordic but have not had replies from either.
Mike