Remedial Wall Ties Damaging Cavity Wall Insulation?

[DIYRalph]

In the process of buying a house that need remdial wall ties, and has retrofit cavity wall insulation it it.

Reading now that isolating the old wall ties/drilling in new ones leaves a load of mortar/brick fragments etc..in the cavity which will case bridging and cold spots in the cavity wall insulation and likely cause some level of increase condensation/damp.

How valid are these fears? Is this going to be more trouble than its worth and should I back out of such a purchase?

 

[noseall]

Reading now that isolating the old wall ties/drilling in new ones leaves a load of mortar/brick fragments etc..in the cavity which will case bridging and cold spots in the cavity wall insulation and likely cause some level of increase condensation/damp.

Drilling holes leaves some debris. Boiler flues, extractor vents, waste knock outs etc, all leave a lot more.