Diamond Masonry & Waterproofing

Diamond Masonry & Waterproofing is a family-owned, veteran-owned company in Merrick that has served Long Island since 2000. Its basement waterproofing work covers interior systems, which capture groundwater before it floods the basement floor, including French drains, sump pump installation, foundation crack repairs and grated channel drains. Exterior work involves excavating along the foundation and adding membranes, foundation grading, window well drainage, dry wells and pop-up drains. It also replaces basement windows, installs egress windows and window wells, and does masonry, pavers and retaining walls. Free estimates are offered, and the company warranties its work for 10 years. It works in Nassau and Suffolk counties. Rated 5.0 from 54 Google reviews, all five stars. Its drainage systems are built from tough materials and designed to fit the specific basement, and the company says its approach keeps a basement dry year round and limits mold and mildew.