How to Fix and Maintain Foundation Parging
Last modified: 2018/07/13 | 4 mins
Have you started noticing signs of wear and tear appearing on the layer of foundation parging on your house?
Here are a few things to know about fixing and maintaining foundation parging:
In Canada, foundation parging mostly serves as a coating layer covering the exterior facade of a building’s foundation walls. The product is mainly decorative but it also helps protect the surface on which it has been applied. Being exposed to harsh weather, over time, foundation parging tends to fade and accumulate dirt. But the main problem comes with the fact that it may start crack. Dirt can easily be cleaned off using a pressure washer. However, the presence of cracks indicates bigger problems.
Different factors that may cause the foundation parging to crack:
The most common causes for cracked parging are: the house moving, the weather and temperature changes. Cracks that measure less than 1 cm should not raise concerns in the short term, unless there are many of them. In order to know if the cracks are active or not, take down detailed information about their current size and come back a few months later to see if they have changed.
However, don’t wait too long because if you see that the crack is active, you’ll have to fix it quickly. Whether the cracks are deep or superficial, always try to understand what exactly caused the damaged, so you don’t repeat any previous mistakes (for example: the type of product used to complete the work).
Parging should be left to professionals, even when the damage level is minor. Resurfacing is a tough job and mistakes will be hard to correct. Since foundation walls are usually visible, even the slightest flaws will pop out and affect the house’s appearance. Also, if you notice that the damage is too significant, the parge coat will have to be removed and replaced altogether.
There are two different types of foundation parging: cement parging and acrylic parging (which is also made of cement but in this case, the product is mixed with liquid acrylic). The former is especially recommended for small repairs. Select a product that best suits your needs and that offers several useful properties (protection against UV rays, durability). If you run out of product after having started the job, always buy the same product, otherwise you risk seeing a difference in colour.
Photo: My Mason
If, despite the previous warning, you decide to go ahead and undertake the repair job yourself, here are a few tips to follow :
Before you start repairing the layer of parging, check the weather forecast. The products that you’re about to use are meant for temperatures over 4'C. Ideally, there shouldn’t be any rain in the 24 hours following the product application.
The sun could also prove to be a nuisance as it will make the product dry too fast. For a good result, you will have to humidify it repeatedly. During the first step of the process, the surface has to be properly cleaned, paying special attention to the cracked areas. If the foundation parging has been cleaned recently, a damp sponge and a brush should do the job.
However, if the last cleaning happened long time ago, it’s better to use a pressure washer in order to properly remove grease deposits, the earth and the sand that have accumulated on the surface of the parging. After the foundation walls have been washed, an antifungal product must be applied.
Next, using a triangular scraper, start lightly digging inside the cracks to check if the parging that is already in there is still solid. If the parge coat starts crumble, stop what you’re doing. This is a sign that you’re going to have to replace the whole layer.
Otherwise, you’re free to start the next step. (Please wear protection equipment on your eyes, nose and mouth as this step could expose you to a lot of dust) The following step involves using a trowel to apply a coat of parging product, being careful not to exceed a thickness of 3/8 inches.
Once the product has been applied, it can be molded for a period of time lasting approximately 40 minutes. After that, it starts to harden. From time to time, make sure you humidify the surface.
Acrylic coating must be applied one coat at a time, so you’ll have to wait to the next day to apply a second one (if need be).
In all cases, read the instructions on the product’s packaging, as each product has its own specific characteristics. Make sure the cement is not exposed to rain during the drying period (which lasts about 24 hours).
Once you’ve finished repairing the parge coat, get into the habit of conducting regular maintenance on the foundation walls.
How much does foundation parging cost?
If the work needs to be started from scratch, you should expect to pay around $3-$4/square foot. Source: Amerispec (price subject to change)
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