![]() ![]() Even though there is plaster over top of this drywall, the paper backing is susceptible to mold. These drywall prefab products were constructed much like today’s drywall, having a paper backing on each side of it. ![]() This drywall product, sometimes referred to as “button board”, was slightly thicker than today’s standard drywall products and was usually 2’ x 4’ in size. These wooden lath are susceptible to mold growth.ĭuring the 1930’s through World War II, the construction industries moved toward the use of prefab products like plywood and a special drywall. If your home was built in this era, and the walls are original to the home, it probably has wooden lath behind the plaster. In older homes, those built in the 1930’s and before, plaster was mixed and then spread over wood lath that had been nailed to the house’s studs. It could be paint, it could be organic dust particles, or it could be growing through cracks in the plaster while it is consuming whatever is behind the plaster. When this occurs the mold is eating and digesting whatever is on the plaster. It is possible to see mold on plaster walls. It just means that the mold isn’t growing because of the plaster. That doesn’t mean that you won’t see mold on plaster walls. It is made with a lime or clay base and is very similar to concrete. Plaster is non-porous (not permeable to water, air, or other fluids) and not organic. The plaster itself is not a food source for mold to grow on. There’s more to this question and that answer than meets the eye. With more than 20 common recessed can light cutout sizes needed the sizes available are seldom going to work.Many times we are asked at Water Mold Fire Restoration whether mold will grow on plaster. Each size of carbide grit hole saw costs between $45 and $80 depending upon the brand and the hole saw only works for one size hole. There good reasons why this is often not the case. In theory it would be simpler to use a continuous edge tungsten carbide rim grit hole saw and cut through all three layers. For chicken wire it is best to use diagonal cutting pliers (dikes) or snips to cut the wire lath. For wood lath a fine tooth bi-metal reciprocating saw blade usually works the best. ![]() For standard metal lath a carbide grit reciprocating saw blade works very well. The best tool for cutting the lath depends upon the material used. CUTTING OUT OLD PLASTER RINGS IN PLASTER CRACKWith the circular scoring motion of the tungsten carbide cutting blades the two layers of the plaster are not likely to separate and cause a crack in the ceiling (which can be very expensive to repair). CUTTING OUT OLD PLASTER RINGS IN PLASTER PROThe Hole Pro adjustable hole cutters make a clean straight cutout hole in the plaster for the can light or ceiling speaker and with the straight edge the grill or trim rings will sit flush against the surface of the ceiling. Second cut the lath using the hole in the plaster as a guide. First cut the plaster and remove the plug. We recommend treating the plaster ceiling hole cutting operation as a two stage process. In many cases the nails that originally held the pieces of lath in place have largely disappeared from corrosion over the years. In prior years the lath could be metal, chicken wire, or wood. After 1950 most plaster ceilings have a metal lath. Plaster ceilings have been done in different ways in different parts of the country and at different times. There are many times when one or more holes need to be made in a plaster ceiling, whether for recessed light cans, audio speakers, a heating or air conditioning duct, or to add a ceiling fan. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |