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DAVIS MASONRY

Parging

Parging is a tactic that is commonly used in the masonry field. It enables one to apply a smooth surface to a masonry wall. Normally, it is used to smooth an exterior wall of a masonry foundation. It is also used to coat or repair imperfections in poured concrete and concrete block walls. There are various tools needed for parging such as a rectangular metal trowel, wooden float, hard bristle brush, a wheelbarrow, drum mixer, or a drill with paddle mixer attachment. You also need a measuring cup, measuring tape, mixing pail, plastic sheet, water spray pump, and protective gear. If a homeowner wants their foundation re-parged, this adds in an extra first step. Normally, we will have to take out the current parging, especially if there is paint over it. We never want to risk parging over paint, as it will have issues sticking. 
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Picture of foundation that has been parged in Davis, CA
Picture of foundation that needs parged in Davis, CA
We start by measuring the surface area of the wall that needs to be parged. We will use this measurement to determine the amount of materials we need in the parging mix. We use a wire brush to clear the wall of any existing dirt, dust or debris. Then we spray the working area with clean water until it is completely saturated. Some walls may require multiple applications of water until it is completely saturated. Next we will begin by mixing the parging mix. It is always best to add the water first to the mixing pale rather than the parging mix first. You will want to gradually add the powder to the pale while operating a drill mixer for roughly three to five minutes. We continue to mix our parging mix until the spreadable, creamy consistency is received. This is an extremely important step because if you do not have the right consistency you work can be compromised. You want to avoid a soupy mix at all costs! Before we begin parge coating, we fill in any mortar joints so that they are flush with the wall. Then, using a rectangular metal trowel we begin to spread the parging mix along the saturated block wall. We aim for an application thickness of about 3/8s of an inch or ten millimetres. If a second coat of parging mix is required, we use a hard bristled brush to create a coarse-textured finish along the wall. This is going to help the next layer to adhere. We cannot add the second until the first layer has dried for at least twenty-four hours. WE use a float to smooth the surface of the wall until its uniform and seamless. Once the wall is finished we allow the newly placed material to set until the surface is hard to the touch. Then, we will cover the wall with plastic or keep the surface damp for at least three days to ensure proper curing. Once the parging mix is fully cured, the wall is ready for any additional construction. Not only does parging give a foundation an extra layer of protection from the elements, it also provides a decorative finish that can be painted or waterproofed. 

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  • Home
  • Services
    • Brick Masonry
    • Natural Stone
    • Concrete Repair
    • Chimneys and Fireplaces
    • Tuckpointing and Repointing
    • Parging
  • Contact Us