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Repair or re-roof?

Posted by Peter Smithers, on Sun 16 Nov 2014 01:31pm

My rosemary tile roof needs a good number of tiles replacing and all ridge tiles remortaring. 2 chimney stacks need repointing. Have just had good insulation installed in attic and boarded it out for storage only. No plans for using as living accommodation. No membrane under tiles - only sealed on the underside with blackash mortar which is all falling off. Do I need the whole roof removing, membrane put down and re-tiling? Or is a substantial passage of air fine because ceilings are well insulated? Either way I'll need scaffolding. Would I save much by simply repairing?