laster washer A plaster washer is a thin metal disk that increases the size of the head of a drywall screw so that it doesn't pull through the plaster. Home Improvement Glossary lastic pipe Plastic pipe comes as either ABS (acrylonitrile-butadiene-styrene) or PVC (polyvinyl chloride). Most homes since mid-1970 have plastic pipes and fittings because it's inexpensive and easy to use. Simply glue the joints together using a primer and liquid cement. Home Improvement Glossary lumb line A vertical guide created by hanging a weighted string from the ceiling. Home Improvement Glossary lumber's snake The plumber's snake has a long tightly coiled wire attached to a handle. This coiled wire can slither down the pipes clearing blockages and even pulling out the obstruction. Home Improvement Glossary lunger A plumbing tool that is used to loosen clogs by using suction to dislodge the clog. Home Improvement Glossary olystyrene foam insulation A type of insulating material made of polystyrene foam. This foam is waterproof. Home Improvement Glossary opcorn ceilings Popcorn ceilings are textured, acoustic ceilings that are sprayed on and resemble popcorn or cottage cheese when they dry. Home Improvement Glossary rime To prime a surface means to apply a primer and/or sealer to the surface to seal the surface and provide the best bond for the paint. Home Improvement Glossary ry bar A pry bar is a flat steel bar with beveled edges in its ends and a hole in one end. Its design gives you leverage to slide one end