This lime putty is used for the finish coat of plaster that is skimmed onto the wall and smoothed to create a hard, shiny finish coat. To create the lime putty:. Master plasterers work with a spray bottle to keep the plaster wet as they smooth it to a perfect finish.
The plaster crew must first assess the existing walls, masonry, or ceilings that need to be plastered. Sometimes they can use the brick surface that remains, sometimes they must affix wire lath to the brick to serve as a support for keying the new plaster. In the Manhattan Brownstone project, a variety of methods were employed, including plastering directly over the existing brick walls that were first treated with a blue bonding agent.
In areas where the brick had deteriorated, wire lath was used to create a sound surface and a level wall. To check your early effort, place the yardstick or ruler perpendicular to the wall, in the wet plaster. You will need to smooth the area over but it is a quick way to check that your work is not too thick. Continue broad arcing strokes and spreading strokes until the whole surface is covered. Allow to dry thoroughly; a few hours is usually adequate.
In a humid climate or atmosphere, allow overnight drying. Put on mask and protective glasses and sand the dried surface to remove any trowel marks or other ridges. Place your face close to the wall and shine the flashlight to detect hard-to-see faults. Vacuum or sweep up the sanding residue. Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY.
More From Bob Vila. How To: Repair Plaster Walls. Bob Vila Radio: Plaster. What Cracks in the Ceiling Really Mean. Newsletter signup: You agree that BobVila. As you could see, patching missing plaster follows a similar path as the original installation. A base coat is followed by several finish coats and a quick sanding to make old walls look new. Cookie banner We use cookies and other tracking technologies to improve your browsing experience on our site, show personalized content and targeted ads, analyze site traffic, and understand where our audiences come from.
By choosing I Accept , you consent to our use of cookies and other tracking technologies. By Kevin O'Connor , Host. Pinterest Email Pocket Flipboard. How to Repair Lath and Plaster in 6 Steps 1. Fix the Lath Photo by Ben Stechschulte Replace any missing lengths of lath, and refasten all loose pieces. Wet the Substrate Photo by Ben Stechschulte Dry lath and the exposed plaster edge will suck water out of wet plaster before it has a chance to harden.
Apply the Scratch Coat Photo by Ben Stechschulte In a clean bucket with cool tap water, mix Plaster Magic patching plaster to the consistency of natural peanut butter. Trowel on the Second Coat Photo by Ben Stechschulte Wait until the scratch coat is firm to the touch—about an hour—then mix up a new batch of plaster to a slightly thinner consistency—closer to that of buttercream frosting.
Smooth the Top Coat Photo by Ben Stechschulte Using a 6-inch taping knife, scrape the patch area smooth, and cover the patch with a thin layer of ready-mix joint compound.
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