My house is well over 100 years old and part of a front wall is slightly bowed out. The surveyor assures me it's not subsidence but is lateral movement of about 10mm, because no lateral restraint was incorporated at build. This only affects one wall which divides the front room and hall and the crack is about 300mm away from the corner. I intend to knock off all the old plaster that is no longer bonded, re-point the gaps in the brickwork and fit up to 6 restraining straps before re-plastering. If this plan is along the right lines:
a) how big should the straps be ? and
b) how far should they extend back to the part of the wall that has not been subject to deflection?
For example I was thinking I could overlay or stagger flat straps to further extend the anchoring to 2 metres or more? Thanks in advance for any advice.