Niche Cubby Shampoo Shelf Sill March 26, 2011 · by madisonsquare · Bookmark the permalink. · … Their stone is successfully set. We’re installing the small pieces ourselves, including these, the window sill and eventually the threshold. Before- good ol’ redgard: Apply thinset: Four niches, after: Well that’s done, now moving right along now to tile… Share this:EmailFacebookPinterestLike this:Like Loading... Related