Planning to use hemp perlite lime mix on most external sandstone rubble walls but have a problem wall which is damper for a couple of inchs at floor at floor level in the corners - wall repairs done using hotmix mortar with no pozzolan are firm but not carbonated to the same level as elsewhere but is still continuing to dry ( 2 years on). Worried the hemp will rot so hoping to get some advice what other insulants people have used cork, glass beads, perlite etc +- sand +- pozzolans and what ratios they found successful.
Done all the usual things to try to dry the wall out - french drain in situ, removed concrete slabs that where up against the house wall outside, repointed outside with lime although in a few places where alterations have been done and built with cement I have been unable to remove all of it. increased the number of airbrick supplying the underfloor void inside ( this is below ground level) . There is no opportunity to lower ground level further because of the newer extensions
Done all the usual things to try to dry the wall out - french drain in situ, removed concrete slabs that where up against the house wall outside, repointed outside with lime although in a few places where alterations have been done and built with cement I have been unable to remove all of it. increased the number of airbrick supplying the underfloor void inside ( this is below ground level) . There is no opportunity to lower ground level further because of the newer extensions