Steps for patching a plaster and lathe ceiling: When originally installed, wood lathe was nailed to the ceiling joists. Reaction score 3,974. The ceiling in question flows into the new kitchen extension, which obviously has new plasterboard ceilings, so overboarding is... Overboarding lath and plaster ceiling and recess lights. CHAPTER 1 – HISTORY OF LATH & PLASTER CHAPTER 1 : HISTORY OF LATH & PLASTER 12/ 15 /2011 performance. When we moved into our house, we decided to get all of the upstairs lath and plaster ceilings taken down. First is to confirm if its lathe and plaster or horsehair plaster sheet, this can be seen from in the roof space your will be able to see the lathes, if horsehair sheet you will be able to see if the scrim over the ceiling joists is still attached. Lath and plaster . Lath and plaster is a process used to finish interior walls and ceiling. Existing ceilings of 15-22 mm plaster on wood lath may possibly contribute up to 20 minutes to the fire resistance of a timber floor under BS 476 test conditions, but this will depend on the condition and key. Repairs to lath and plaster walls and ceilings . Discussion in 'Builders' Talk' started by Robot Enthusiast, Oct 27, 2020. The best product for filling cracks is 2 coats of cornice adhesive and a final coat of top coat. This Diagram, shows the filling and cutting out of a crack in lath and plaster walls or ceilings. It also offers a larger surface area and physical key for lime plasters to adhere to, therefore making it more appropriate for ceiling repairs. The cost to Remove Lath And Plaster starts at $2.94 - $5.94 per square foot, but can vary significantly with site conditions and options. Originally, the hall ceiling was covered with woodchip wallpaper. Lath and plaster were first used to finish interior ceilings and walls from the 18th century to the mid-1900s before modern gypsum plasterboarding and plastering took over. If the plaster sags 1/2" to 1" from the lath, there is often too much debris (broken keys, years of silt) between the plaster and lath … A sagging ceiling does not necessarily mean that the plasterwork has broken away from the lath though.Old houses settle and the ceilings go along for the ride. Hi all I'm planning a refurb to my flat. Its common to replace all plaster lathe ceilings and walls in the UK, heritage or not. If this is being considered then you may need to check with an engineer to ensure the floor or ceiling joists are capable of carrying the additional load. One option is to cut out the damaged area and install a 3⁄8” thick sheet of blue board and plaster. Secure sagging plaster to the lath above by using screws and plastic washers. If the separation is slight—say, between 1/4" and 1/2"—good reattachment is likely because the plaster will usually push back into place solid and flat against the lath. First floor Victorian flat with access to the loft. Trowel a scratch coat of plaster onto the lath. Removing plaster and lath is always an ugly ordeal, but my first try, 25 years ago, was the worst. lime or cement) have different hardnesses etc … Lath movement— when the base material, “lath”, separates from the plaster, or nails securing the lath to studs become loosened, stress cracks become evident across the plaster surface.This can be fixed be either completely removing the plaster and re-securing the lath to the structure, or by carefully injecting a binding resin to secure it. Lath and Plaster ceiling - Remove? Read on and I’ll show you how to remove plaster and lath faster, safer and better. Patron. Is it easy enough to do or will it be a right pain? Also from what I've read new lime plaster on ceilings can't be walked on once done for a while because of cracking etc and we have two DC so we can't leave bedrooms/bathroom out of action. "In older house, lath and plaster ceilings may be countered, this technique was largely replaced by plasterboard in the 1950's. Repairs to Lath and Plaster ceilings. small repairs - large repairs. Plaster mixed with horsehair or goat hair was then forced onto the lathe, forming a key that holds it to the lathe. The ceiling is Larve Plaster, I was thinking of installing JCC LED7's but I am concerned about maintaining the fire rating of the ceiling. Different materials (i.e. If there are areas where you suspect that the plaster has separated from the lath gently push upwards with the palm of your hands. Gavin John Hyde-Esteemed. ‘Laths’ are thin strips of wood (about 25mm wide) nailed to the ceiling joists, spaced about 5mm apart. Therefore a detailed inspection is required before Our ceiling cavity photograph of a plaster on metal lath system (below left) shows how plaster applied to metal lath has considerably more adhesion security than plaster applied over wood lath. There is also a tendency to take a short cut and overboard, leaving the existing ceiling in place. Been asked to put a load of downlights into a lath and plaster ceiling. See typical tasks and time to remove lath and plaster, along with per unit costs and material requirements. We can't afford to put up new lath and plaster ceiling. Lath and Plaster. Traditional plastering has several steps: Nail the lath to the framing. What is lath and plaster? Prior to the widespread use of drywall after World War II, most walls and ceilings were constructed using a lath and plaster system. Since then, I’ve gotten smarter. The instructions only mention installing in plasterboard and with the wood content of the Larve ceiling and the fact the fire hood will be in direct contact with the wood I don't think I should be fitting them. Laths are the wood slats that run perpendicular to the joists. Get fair costs for your SPECIFIC project requirements. Thickness of the plaster varies, so be sure the screws are long enough to go through the plaster and lath. If we chose to overboard the ceiling, it would stop the ceiling from breathing anyway? Arms. The old paint requires removal before you can repair and repaint the plaster ceiling. There were a lot of bulges and cracks (with dust and muck falling through the cracks into the rooms below), so clearly needed replacing. You can board over it, but you should be aware that there is a lot of weight in these ceilings and the plaster can be up to an inch thick. Plaster and Lath Pro Tips. Hi all, I have a lath & plaster cracked ceiling repair to do and I need some advice on how to best tackle this problem. Trowel on, then roughen the brown coat after it … The lath and plaster technique was generally used to finish interior walls and ceilings from the 1700s to the early-to-mid 1900s before it was superseded by modern gypsum plaster and plasterboard. It consists of narrow strips of wood which are nailed horizontally across the wall studs or ceiling joists and then coated in plaster.The technique derives from an earlier, more primitive, process called wattle and daub.. Old plaster tends to crack, and layers of old paint can create a peeling, flaky mess. Anatomy of a plaster job. Riven timber is hand split along the grain and is generally stronger, but less flexible than sawn. Older ceilings sometimes crack and fail due to a variety of reasons. Traditional timber lath are commonly made from oak or chestnut and fixed by hand. Done plasterboard but not lath and plaster. Ceiling Preparation. The old way of doing this was by using plaster washers which are a larger wash the is screwed through the face of the plaster into the lath to mechanically support the plaster. See professionally prepared estimates for lath and plaster removal work. Lath is the name for the narrow boards of varying widths that are fixed to the timbers inside your walls. When a ceiling required repair, it is important to understand the differences between the two types and know which method was used when the ceiling was erected. From the early eighteenth until the mid twentieth century, ceilings were usually made using lath and plaster techniques (see right). Lath and plaster is a building process used to finish mainly interior dividing walls and ceilings. Remove loose plaster from any holes in the ceiling. Use a utility knife to create a smooth edge. Other tell tale sign is if the ceiling is segmented with strapping dividing the sections. This creates a horizontal working surface that allows the plaster to bind to it to give your walls a lasting surface. However, most lath and plaster walls and ceilings in this country are at least 40 years old and often past their “sell by” date.The laths are very flexible allowing the wall to move, the plaster by now, often crumbling behind and in between the laths. Most pre-1930s houses have ceilings made of traditional lath and plaster which has a pleasing texture that’s slightly irregular. Then to cover the washers you would have to apply a couple coats of plaster over the ceiling building it … Lath and plaster ceilings weigh around 0.5kN/m2 and plasterboard 0.15kN/m2. Hi all I spent last weekend stripping wallpaper off the walls, and the ceiling, in one of the bedrooms of my house. I thought it was the externals and footprint that was listed not internals, unless your are chnaging the room layouts doors and windows etc... but not sure about Aus heritage BC is the best to answer this as the forum expert on Heritage and listings. The laths are commonly made from either chestnut or Oak and are about 2.5 […] Unless it is of particular merit, taking down a lath and plaster ceiling is often the best way. So, if your ceiling is sagging or sloping, it may still be OK. The house is probably 500 years old but the ceilings could have been any age. This official sponsor may provide discounts for members. I made every mistake in the book—mistakes that cost me time, frustration and blood. Through full 1-5 The explosion of Venetian plasters onto the market would certainly be proof that the visual beauty and romance of plaster is anything but dead. How to Repair a Sagging Plaster & Lath Ceiling. Robot Enthusiast Member. You really don't want to be underneath it if a chunk of that comes down. The lath is the timber that is tacked by hand on to wooden joists. The laths are the strips of wood (usually about 25mm by 6mm (1 by 1/4 inch) nailed to the underside of timber joists with about 6mm (1/4 inch) gap between each lath. The cracks extend to the cornice as well, so those cracks need to be filled, made good and painted as well. When making any repair to lath and plaster, the same type of materials, or similar, to the original construction should be used. The wet plaster of this coat oozes through the gaps in the lath and becomes a mechanical key when it hardens. Prior to filling the crack, using a wet brush, brush out the loose debris and wet the interior of the crack. Sometimes crack and fail due to a variety of reasons by Robot Enthusiast, Oct,... Of drywall after World War II, most walls and ceilings dividing sections. That comes down is probably 500 years old but the ceilings could have been any.. 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