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The mortar joint which contains the DPC was pointed over resulting in the dpc being hidden behind the pointing and therefore bridging the dpc. I have raked out the mortar and I can now see the dpc, but it does not protrude from the face of the wall, it is about 1/4 inch in. I now have a...

My dpc was bridged by mortar so I raked out the joint to expose the dpc membrane, the joint is now exposed to the weather and quite deep, how do I now fill the joint, is there a mastic I can use?