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Mr_Smyth
@Howard
I'm installing a new door cill.
I need to build up and level the substrate. It's a mess. At some point an air brick has been put in which sits proud of the existing brickwork and course isn't level.
The previous dealt with this by packing mortar between the old cill and the DPC which might explain why the cill rotted from below.
Any suggestions on a product to do the building up and levelling? Something that's easy for a numbskull like me to work with.