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Ok, chaps here is the reason why my boiler started omitting black smoke. Firstly the grant engineer didn't blame the installer for any errors in commission . After cleaning everything out for about 2 hours, that's on top of the installers engineer cleaning out for hour or so. He fitted a...

I agree with foxhole. Stone is porous and sealer would not be able to hold back damp. Movement in the joints through thermal expansion will always let in a certain amount of damp. The ceiling inside under the steps will need to be tanked and probably any side walls adjoining the steps.

I had a new grant vortex pro external boiler commissioned last month December , and it now pours out black smoke from the flue. It now turned off. The Grant engineer is due to visit. As installer said it was too dirty for him to do so he got grant to come out Must be well gunned up with...