flaunch

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flaunch

(flɔːntʃ)
n
(Building) a cement or mortar slope around a chimney top, manhole, etc, to throw off water. Also called: flaunching
[C18: variant of flange]
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consolidation of the ruins including: raking out of defective mortar joints, re-pointing with new pointing mortar, taking down and reconstructing, facing out and grouting of wall cores - localised re-construction of parts of the ruins - dismantling and localised re-construction of the wall tops, laying of new lime mortar flaunching fillets on the wall tops - laying of gravel on a weed suppressant membrane on parts of the yards and building floors to prevent future colonisation by vegetation.
Over a long period of time driving rain can erode the pointing between the masonry structure and the flaunching, onto which the chimney pots are bedded, can crack and loosen.
Also check for any damage to chimney pots, including the flaunching which secures the pot to the chimney stack, since bad weather can cause this to crack.