Hi Mark,
Thank you for your enquiry.
We do not recommend that you insert our products into pre-existing holes from previous treatments. This is because you cannot be sure what chemicals have been used previously and also our Dryzone products are designed to be inserted into the mortar course.
We would advise you to drill the new holes into the mortar course above the pre-existing damp-proof course.
I hope this helps.
Kind regards,
Mollie
Can you use the original holes from the previous system that’s through the face of the brick and not in the mortar joint, if so can you recommend the type of system I require, would rods be more suitable or creams , than you mL