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My place has a room over a carport with a 3.5m horiz. crack (outside & a bit lower inside), about 6 courses up in the rendered blockwork cavity wall that's sits on the lintel over the entrance to the carport. Is there a best time to repoint (I thought Spring or autumn, somewhere between the extremes of expansion/contraction in winter/summer). Is there a procedure, obviously I don't just cut out a 3.5m length of mortar course in one hit, and then think about getting some mortar put back in? What happens when a wall tie is encountered? What mix mortar goes back in? What about the various mortar raking tools available from Scre**ix. Are they up to it? And any tips, generally, would be welcome.
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