Natural stone siding may be slate, granite, limestone, or sandstone. It’s often cut thin and installed over a wood, metal, or concrete base. In that case, weep holes usually allow moisture to escape from behind the stone.
Water can get in the gaps between stones or get trapped between the stones and the base. Grout and mortar can fail. Due to the weight, a strong frame is important.
Every spring and fall
100 years
Step 1: Check for loose, cracked, or fallen stones. Damaged or loose stones can leave space for water and critters. If you discover these issues, make repairs a priority.
Step 2: Look for loose or crumbling grout or mortar between stones. Pay close attention to inside and outside corners, which are prone to wear and damage.
Step 3: Remove anything growing on the stone. Moss, lichen, mold, and vines can damage the grout, even if the stones themselves are fine. Make sure shrubs are trimmed back at least 6 inches from your walls.
Step 4: Stained stones or areas that stay damp may indicate a moisture problem. Check for a weep screed or weep holes along the base of the wall and make sure the holes are clear. If you’re concerned, contact an environmental testing professional to do a moisture test.