I need to 'join' two parallel brick walls - about 3' long & 5 courses high and about 1" apart.
They are in a garden and one wall has a small gate post fixed to it. This wall has partly fallen down & needs rebuilding, the other wall is as solid a rock.
Plan A was to use steel frame ties to bond the two walls together & improve the overall strength. Plan B could be to pour a wet concrete or mortar mix into the 1" gap once the wall has been rebuilt or indeed as it's being rebuilt. In the latter case I could PVA everything.
Any thoughts as to which method will be stronger? Would mortar be better than concrete?