What repairs might flues or hearths require?
A. Old chimneys were commonly lined internally with lime mortar parging when built, assisting the flow of gases and improving fire protection. Parging may crumble over time, with debris falling across the flue or on to the hearth. Debris can also arise from the deterioration of the upper diving masonry (‘withes’ or ‘mid-feathers’) between flues. Repairs to parging or withes may be possible where safe access can be provided, otherwise the insertion of a modern flue lining might have to be considered. Providing some ventilation is maintained, disused flues can be capped after sweeping to keep out birds and help prevent dampness. Cracks in hearths are a fire risk. A simple remedy is to lay a new stone hearth over the original. All most fireplace surrounds require is regular sweeping or vacuuming and occasional washing (except sandstone, which stains). Avoid sand-blasting and harsh abrasives. Q. Presumably chimney sweeping shouldn’t be forgotten? A. Failure to sweep a flue properly or regu
