Revisions log for Answer #2068
This is the answer to the question What kind of mortar to use to install a granite window sill?
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2022‑09‑09 23:13
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When you install interior window sills (I assume they are interior sills), you also have to make sure they don't adjoin the exterior sills under the frame (thermal bridge).
The voids of the foam bricks are sealed with masonry mortar, then the mortar is raised to the proper height and troweled. Before laying, light-colored granite is further sealed on the underside with white natural stone adhesive and then installed with flexible tile adhesive.