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. Plaster weld Patch#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. If approved, you’ll be automatically refunded an in-store credit in the form of a gift card that you can use in the future.Many houses built before about 1950 retain at least some of their original plaster walls. We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item. Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.Ĭertain types of items cannot be returned, custom filled aerosol cans or custom tinted material You can always contact us for any return question at and issues Items sent back to us without first requesting a return will not be accepted. To start a return, you can contact us at your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. You’ll also need the receipt or proof of purchase. To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
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