Fresh caulk is no longer made of clay but of materials such as silicone and acrylics. Doing caulk in and surround your house is among the coolest and most helpful of all homeowner projects. Like the clay chinking of pioneer days, today's caulk also seals small gaps in brick, wood, drywall and other common house construction materials. Trapping interior heated or cooled air will save many dollars of utility costs but caulking pays even bigger dividends.