Hawksmoor's crypt floor is brick laid on edge with an inch-thick waterproofing layer of ash and tar on top. In the 20th century, sectional concrete slabs of varying depths were cast over the top. We leveled the concrete to a uniform datum and laid a Delta cavity drain membrane with insulated concrete slab and underfloor heating. The finished floor is 50mm York stone on a sand and cement bedding with lime jointing. This dispenses with the requirement for movement joints, creating a seamless finish.
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