The British Standard for wall ties – BS1243 was introduced in 1945 and was a ‘prescriptive’ standard – ie all ties had to conform to the approved design of the time, and the ‘butterfly’, ‘double triangle’ and ‘fish-tail’ were...
We have had a structural engineer to check a house we are looking at buying. He said that there is an issue with the wall ties as they were set in black ash mortar.
How does Peter Cox isolate old fish tail ties? My mortar bed is about 10 mm thick
My surveyor thinks my house suffers from wall tie corrosion. Does this means replacing all the ties?