![]() ![]() Start by cleaning out all the dust and loose plaster from the damaged area, if the laths are not exposed,Ĭut back the plaster to form a deeper hole - try to undercut ![]() The technique for repairing lath and plaster is basically the same whether dealing with lath and plaster walls or ceilings. Refer to our article lath and plaster construction and techniques for details of basic techniques. lime or cement) have different hardnesses etc which, if mixed, will lead to a repair failing. Or similar, to the original construction should be used.ĭifferent materials (i.e. When making any repair to lath and plaster, the same type of materials, It addresses the entire ceiling system.Repairs to lath and plaster walls and ceilings.It effectively converts the plaster ceiling from a fragile suspended system into a strong, consolidated adhered system.It strongly adheres the plaster to the wood lath with flexible adhesive that can withstand the building’s vibrations and prevent cracking.It greatly strengthens the plaster matrix with the infusion of acrylic resins.In turn, this allows the HPCS method of plaster consolidation to accomplish five important objectives: The acrylic resins are specially formulated to maximize penetration into the plaster base coats.Īs one of the few authorized installers for Historic Plaster Conservation Services, we can implement the advanced technology required to save old plaster by addressing the problem at its root - where the plaster meets its substrate. The plaster is then flooded with two applications of acrylic resins with different degrees of dilution, followed by an application of undiluted acrylic resin. ![]() The treatment method begins by thoroughly cleaning dirt and debris from the back of the plaster. Test areas are used where broken keys are counted and key & lug pull tests are performed. Therefore, inspection must be conducted in the attic or by other means of accessing the backside of the plaster. Mechanical structural components are located on the backside of the plaster. It is essential to inspect the structural components of the system to determine the extent of deterioration. This makes the HPCS treatment method better suited to long-term preservation of the plaster system. Not only does this process strengthen the plaster, but it also helps protect against future damage and deterioration. The HPCS technique does not require a large amount of labor or materials, making it more cost effective than traditional methods. The process works by restoring the bond between the lath and plaster so that it can remain strong for years to come. can also ensure that the plaster is not compromised in any way. The HPCS consolidation treatment method works just as well on plaster & wire lath as it does on plaster & wood lath.īy using the HPCS treatment method, John Canning & Co. The HPCS treatment method is far superior to all other treatment programs because it addresses the entire ceiling system rather than just isolated spots. Other contractors might use the old process of repairing like-with-like based on the belief that only material similar in nature to the original material should be used, the standard wood screws and washers to re-secure ceiling & wall plaster or even spot injections of acrylic resin. We use the HPCS treatment method to tackle wood lath deterioration and failure projects. John Canning & Co.’s expertise in plaster conservation is among the most respected in the industry. This will make sure the suspended system is secure and that it performs its intended purpose effectively. Reinforcing with new material or improved fastenings can help to redistribute the load and take some of the stress off the remaining keys. ![]() To ensure a wood lath & plaster ceiling remains strong, the broken keys must be replaced or reinforced. As more and more keys break, the load on the neighboring keys increases exponentially which can lead to failure. When the next key breaks, the load on its neighbor increases to 150%. This represents a 50% increase in the load they were taking up. When one key breaks, the support work it was performing is passed on to the adjacent keys on either side. In turn, they will start to deteriorate and break. Over time this wood and plaster ceiling system begins to deteriorate and causes stresses on the keys & lugs. ![]()
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