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To check the quality of staircase joints there are three options for properly sealing these joints, and each method has its pros and cons.
Pointing joints For staircase preservation, during pointing, the new mortar must be tightly applied in skinny layers and then tooled to a sleek concave end. But, mortar is a porous material. Over time, water infiltrates the mortar, making it susceptible.
Using sealant Although, unlike mortar, a sealant is an impermeable material. But sealant is not capable of taking as much abuse as mortar.
A final method For repointing these joints involves a combination of mortar and sealant application. The existing joints are properly cut and repointed with mortar, and a bead of sealant is then applied over the mortar.