![]() This article concerns itself with three-coat plaster, applied to wood or metal lath and troweled smooth. The result is a superior, handmade wall surface that offers surprisingly good insulation and sound-proofing qualities. Once the brown coat has cured, the top or finish coat goes on, either smooth or in a variety of textured finishes. The Brown CoatĪs the brown coat goes on, the plasterer levels out wall surfaces and creates square and plumb corners. The top surface of this scratch coat is then scored to prepare it to receive the second or brown coat. The plasterer forces the wet mixture thickly through gaps in the lath to form “keys” that harden and lock the coat in place as it cures. Three coats of wet plaster are applied in layers to the lath: the scratch coat, the brown coat, and the finish coat. Illustration by Rob Leanna based on Kathy Bray What is a 3-Coat Plaster System?Ī traditional multi-coat plaster system begins with a substructure of lath-thin wood slats or metal mesh-that’s attached to the wall framing. Three-coat plaster is a system of multiple layers that work together to form a strong, sound-dampening, fire-resistant wall. ![]() About 150 years ago, a new component, gypsum, was added to the sand and lime mixture to enable the plaster to cure more quickly and allow for faster working times. Historically, plaster consists of dry components including sand, lime, and cattle hair (or straw or manure) mixed with water to create a wet, plastic medium that cures and hardens as it dries. More serious repair problems include delamination, bulging walls, and key failure, where plaster has broken loose from its grip on the lath substructure.Īpplied with craft and skill, interior plaster is a near-magical building material for creating and coating walls and ceilings. The most common type of damage to plaster is cracking, progressing from the superficial and easily repaired to deeper and wider cracks that require multiple repair techniques. ![]() It’s much easier to repair cracks or patch holes with this versatile material than with drywall. In many cases, problems with plaster can be fixed. If sections or entire walls need attention, don’t let the idea of working with old plaster intimidate you. So, whether you're fixing a broken vase or undertaking a big DIY project, get to know your glues and adhesives and choose the best one for your job here at B&Q.Many houses built before about 1950 retain at least some of their original plaster walls. Maybe you’re a stickler for a well-trusted brand, so why not check out our collection of Gorilla glue and Loctite glue, as well as Evo-Stik adhesive and UniBond adhesive, all renowned for their great strength and reliability. You can have confidence that your bonds will stick when using the correct adhesive for your project. Here you will find adhesives specifically designed for your task, such as grab adhesive, waterproof adhesive, flooring adhesive, and more. Epoxy adhesives are great for fixing metal and ceramics because of their super-strong bonding properties. ![]() For example, PVA glue is great for woodworking DIY projects, whereas superglue is perfect for smaller, more fiddly jobs like fixing broken jewellery. There are many different types of glues and adhesives available at B&Q, each with their own properties. Adhesives, on the other hand, are thinner and often come in an adhesive spray can or bottle. Glues are thicker and often come in a tube of liquid or as glue gun sticks. When undertaking a DIY project, it’s important to understand what glues and adhesives are available out there and which is best to use for your task in hand.įirstly, let's understand the differences between glue and adhesive. ![]() Discover a fantastic selection of glues & adhesives at B&Q. ![]()
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