Hairline cracks in concrete are usually the main causes of water leakage problems at home and in commercial buildings.
One common waterproofing technique used is the Polyurethane injection grouting for sale(a.k.a Polyurethane Injection), a conventional hacking method. Contractors using PU Injections usually drill a hole into the problem area, where the PU is then pumped into the hole. The chemical composition in the injection is then triggered to expand and fill up the walls or ceiling, blindly covering the whole area in hopes of filling in these hairline cracks.
Think of it like this: PU is made of the same spongy material found in chair cushions. The chemicals used in PU injections are broken up into two separate solutions to be mixed together before pouring the material into a pump machine. Then, it is pumped into the ceiling as the PU begins to react and expand.
Websites and social media like to advertise this method misleadingly- with claims that their in-house method requires no hacking, is fast-drying and has a clean operation throughout!
However, when looking into common practices done by most contractors- their claims just don’t match.
1. No hacking required, but DRILLING is required!
Despite not being a hacking method, PU Injections still require holes or scrapes to be made to the wall or ceiling. Drilling creates as much, if not more, noise and fine dust than hammering and hacking. Just for your understanding, the first thing a contractor learns when working on PU Injections is how to drill a hole into the affected area. More specifically, it’s to learn how to drill in a 45° angled hole through the suspected crack area to be filled in with PU later on.
2. It can take a long time to complete the repair.
The thing about the PU Injection method is that it is a long process of drilling, grouting, sealing and cleaning. Add in some unforeseen issues and the entire process will take some time and patching up to complete. After the drilling, the contractor will use a high-pressure injection grouting machine that injects the polyurethane into the hole. This is when you will notice the excessive polyurethane dripping downwards from the hole.
If there are no more leaks, the contractor will proceed to clean up and properly seal the injected area. Our previous clients remarked that the spilled and solidified polyurethane were left there for up to 2 WEEKS before they were properly removed and cleaned up. In between the 2 weeks period, they noticed a recurring wet spot, resulting in them having to drill and inject the problem area again. Unfortunately, the wet spot can be a result of heavy rains or poor workmanship. solutions, drying time and cleaning up.
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