Black-ash mortar causes accelarated wall tie corrosion. This is a rare site example of well galvanised cavity ties of the same age, installed in black -ash and sand/lime on the same property. This wall tie survey is in Gargrave, Ilkley, Yorkshire. A wall tie survey carried out by Brick-Tie Limited [ Ссылка ]

The surveyor is carrying out a wall ties survey in order to produce a wall tie report. The boroscope shows that in the walls contructed using a lime based mortar the galvanising is still intact in the cavity, with no signs of wall tie corrosion. The tie inspected in the wall constructed using a black ash type mortar is in severely corroded condition. This happens because the black ash contains impurities, which are acidic in nature. Lime mortar is very alkaline, which has a passivating effect on corosion.

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