Chimney breast repair.
Rebuilding brick chimney stacks.
Capping and vent repairs.
Keeping a chimney in good repair is an important aspect of making a home look good, and it’s also essential for safety.
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Chimney Repair London.
A combination of erosion, acid attack and salt crystallisation are liable to cause a chimney to lean. The BRE Good Repair Guide says any chimney that leans more than 1mm in 100mm is unsafe. This is perhaps a little too cautious and where historic buildings are concerned, one may wish to apply the middle third rule to the shaft wall around the flue. Thus where the shaft wall is half a brick thick, a lean of 35mm could be tolerated, but if in any doubt, consult a structural engineer.
Rebuild The Stack
Where repairs are impossible, the remedy of last resort is to rebuild the stack from some convenient point – say the top section only or completely from below roof level – using as much salvaged material as possible. To comply with The Building Regulations any rebuilt section will have to have an internal diameter of 200mm (although 185mm is acceptable for a relined flue), so some ingenuity may be required to incorporate a flue liner within the original stack dimensions.
If it is decided that the existing lean on a stack can be tolerated the factors inducing the lean should be stabilised. The flue should be lined and broken or decayed bricks should be cut out and replaced. In slender stacks it is a wise precaution not to take out too many bricks at a time (sometimes no more than one at a time) and the new mortar must be allowed sufficient time to achieve strength before proceeding with the next area of cutting out. Cracks should be repointed and all ‘defective’ mortar raked out and repointed.
- Brickwork pointing and repointing
- brick chimney stacks
- Capping and vent repairs
- repair of chimney pots
- replacement of chimney pots