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Nanotechnology vs PU Injection

Everything You Need to Know about PU Injections to Solve Your Leakage Problem

The differences between this drill, pump, seal method and Nano-G’s Nanotechnology Waterproofing.

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 PU injection (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!

X company is advertising a promise for a toxic-free, hack-free, and fast PU Injection service. But our experience as waterproofing experts tells us that X might be stretching the truth!

Here’s a quick comparison of conventional PU Injection methods and Nano-G’s Nanotechnology Waterproofing. However, when looking into common practices done by most contractors- their claims just don’t match.

pu injection and waterproofing comparison

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.

We should also mention that the method in question we’re talking about isn’t the PU materials you can get in your local DIY shop. The chemicals used in this process have to be handled using heavy duty machines that mix up the chemicals before filling up the hole, where it should expand into.

Nano-G strongly believes that hacking methods should only be used as the last resort by any home or business owner for their premises. That’s why Nano-G’s Nanotechnology Waterproofing is done without the need for any hacking or drilling! Instead, we developed our solution to be able to seep into the thinnest of hairline cracks on any surface, filling up and protecting the layer from any further damage.

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. If you’re unlucky a poorly done PU Injection can lead to a recurring water leakage that lasts for MONTHS even after repeated patching.

As a home or business owner, you need to ask yourself: Do I really want my ceilings looking like this?

Nano-G’s Nanotechnology Waterproofing solution, however, does not require any drilling and only takes about 24-48 hours to complete. This includes the work area preparation stage, application of the solutions, drying time and cleaning up.

3. Polyurethane is a known respiratory toxin.

Homeowners have to take note that Polyurethane is a petroleum-based method that can release harmful gas into the air as it is being applied. In fact, exposure to fumes from wet Polyurethane is known to provoke asthma and cause other issues to the throat, eyes, and skin and is definitely not safe around young children.

Four of the harmful chemicals found in PU Injections.

Instead of creating a health hazard for our clients, Nano-G ensures that our work materials are safe for your home, office, or business. This is because our nanotechnology waterproofing solution is a non-toxic material that doesn’t emit strong-smelling and hazardous chemicals. Therefore, you can still be present during our operation to have a look at what we do!

Take a look at what Nano-G’s previous clients have to say about our on-site services, here!

4. It’s messy, dirty and needs a thorough cleaning.

Not only will you be dealing with the harmful fumes, drilling noises, and unsightly drying times, you will also have to deal with the possibility that there will be stains that you can’t clean! PU Injections tend to leave marks on the walls or ceilings that are quite noticeable when you first walk into the room. Imagine after all the hassle you had to go through when dealing with the process and you’re left with specks of paint all over your furniture!

Our clients remarked that the PU Injection method left their premises in a mess, and later had an issue where they were not able to match the ceiling paint of their home! Therefore , we recommend for homeowners to be present as the application is being done and be firm on cleanliness once on-site application is done.

Nano-G’s experts are disciplined when enforcing a special on-site SOP that keeps your premises always clean and tidy, while not causing too much noise when applying our nanotechnology waterproofing solution. This includes cleaning the work area before and after the operation, as well as a final inspection from our supervisor. If your water leakage problems aren’t fixed from our workmanship, our solutions come with a money-back guarantee! If you’re not satisfied, we’re not satisfied.

5. PU Injections are a bad idea for plaster ceilings.

In homes with plaster ceilings, homeowners should take note that your contractor will have to cut a hole into the plaster ceiling that is big enough for them to reach the concrete ceiling hidden above.

PU Injection are a bad idea for plaster ceilings

The whole process creates a lot of dust and debris, as well as a wide and long hole in the ceiling. What’s worse, most contractors will only patch up the area they had drilled or hacked open. In older homes, this issue is even more of an eyesore as the plaster around the crack must have already aged into a cream colour, making it very obvious that rectification work has been made.

With Nano-G, our solution doesn’t require us to cut a hole into your ceiling. We’d also like to mention that we were able to solve numerous water leakage issues that conventional waterproofing methods like the PU Injection couldn’t solve. Many of our clients have remarked that both our Nano-G Nanotechnology Waterproofing and on-site SOP were the hassle-free, hack-free, non-toxic and effective solution they have been looking for.

Have a look at what Mr Edward had to say about Nano-G’s onsite service in his testimonial!

After engaging with Nano-G’s services, I realised Nano-G’s staff were very fast and also very professional and did not disturb the mother’s and their babies’ rest. I am quite satisfied with Nano-G’s service. I give them a thumbs up.”

Mr Edward, Woyo Confinement Center

Still looking for the right solution to your water leakage problem?

Nano-G’s Nanotechnology Waterproofing solution is the satisfaction guaranteed solution you’ve been looking for to solve your water leakage issues in a hack-free, non-toxic and dust-free manner. Nano-G’s Waterproofing Experts are trained to follow a disciplined on-site SOP that keeps your premises clean and tidy, before, during, and after our rectification work. This is because our solution only needs our experts to lay down our water-based nanotechnology solution on your floor to waterproof them, and should be done within 24-48 hours!

Don’t wait too long to get your water leakage problem fixed! Rectify the issue before it causes further damages to your home! If you’re still unsure about why Nano-G is a better choice for your floors, drop us a message to find out what we can do to help you fix your water leakage problems!

Need help with your water leakage problems? We’re the experts for you, message us on these platforms:

Facebook m.me/nanogmalaysia
WhatsApp nanog.wasap.my
Or give our hotline a call at 1800-18-6266

Editor’s Note 14/4/21: This article was originally published on 21/1/21 and have since undergone minor changes to more clearly present our advice to homeowners.

5 Replies

  1. CHAN
    at 2:34 pm

    I think this article is misleading all house owners .

    1) Hacking and drilling is different ..
    2) P.U Injection Foam it dry and cure within 15min depend on how many percent catalyst it content and depend of the formula . ( what u say 2 week is really misleading owners )
    3) Health and safety
    Yes , P.U is chemical , it contain harmful but when it totally dry it wont harm anyone .
    4) Appearance
    messy and dusty, leaves leaking polyurethane on ceiling —-> this is very depend on the applicator as i see a lot application they can do a proper protection and after it totally cure remove all PU from ceiling and floor .
    Remark : this compare is not really true from a Product and workmanship different .
    im sure when u do nano-g water repellent also will dirty the toilet with cement grout . and your team will do a proper cleaning to make it “CLEAN” .

    Conclusion : im quite disappointed after reading your blog .. i thought will learn something here but this blog is just misleading house owner think that WATER repellent is the only best waterproofing .

    • nanog@admin
      at 5:05 pm

      Hi Mr.Chan, thank you for reading our articles! We appreciate your feedback and would like to address them:

      1. Thank you for clarifying that PU Injections aren’t hacking methods. However, we do feel like homeowners have to be aware that it requires contractors to drill holes in the concrete wall or ceiling. Not only does drilling make loud noises, but it also puffs fine dust into the air that would be inhaled by homeowners. As the reason why homeowners choose to look for no-hack methods is to avoid too much dust in the air near loved ones who have asthma, we feel it is important they are aware of this fact.

      2. PU injections can take about 2-4 hours depending on the scale of the affected area. The case of the 2 weeks we mentioned before is based on what many of our clients had experienced. Which is that they had to wait 2 weeks before their contractors came back again to break off the excess materials. We’re speaking on behalf of our clients and our observation of poorly done PU injection services offered in the market currently and want to help homeowners understand what to expect when using this method.

      3. We are referring to the health and safety of homeowners during application. We felt it was important to inform homeowners that Polyurethane releases harmful fumes which can be harmful to both the applicator and homeowners with respiratory issues.

      4. Yes, we see your point. The cleanliness on-site is very much dependent on how well the contractors do their work and is not the material’s fault. Unfortunately, we’ve received many negative feedback from our clients who have engaged with less disciplined contractors that left their homes in a mess.

      We acknowledge that PU, when done right, can be effective, but many of our homeowners come to us with reoccurring water leakage issues thanks to poorly executed conventional waterproofing methods.

      However, with respect to your feedback, we will do minor updates in our article to provide clearer information to our readers. Thank you so much for voicing out your concerns!

  2. CHAN
    at 10:48 pm

    All your reply was all YOUR CUSTOMER FEED BACK . You shouldn’t write
    ( Everything You Need to Know about PU Injections to Solve Your Leakage Problem )
    It should be Everything you need to know if choose wrong contractor to do PU injection will cause you this problem)

    You are still misleading all house owner that not clear what is PU injection by YOUR CUSTOMER POINT OF VIEW .

    as you mention that many negative commend from your customer might be only 5% of the market in whole Malaysia .

    2 ) Im here to tell you that this drying time is WRONG ! PU only take few min to DRY! Please dont mislead house owner .
    give a RIGHT information to MALAYSIAN .
    3) Can you tell me that do you really see a P.U Injection before?? do you mind to drop by youtube to check any installing progress before you write this ? https://www.youtube.com/watch?v=4BwW6WTokjA .

    I do respect your afford to write more article to educate house owner. But please make sure you write a correct information . NOT all based on your customer feedback.

    • nanog@admin
      at 6:29 pm

      Hi Chan,

      Thanks for sharing some hands-on information. We do agree that hiring the right contractor is key, hence our duty is to help homeowners know what they should expect by understanding the real problems they may face from duration, processes to service level. We trust that with such knowledge sharing, we can build a more informed community, at least from the perspective of a professional and reliable waterproofing entity.
      Thanks again for your time in chipping in some valuable information to our Knowledge Base team. We have already updated it into the relevant article.

  3. Wong

    After searching through the videos on YouTube and other articles published on Google, found out the information stated in this article is misleading. You can promote your service and highlight the advantages of your service. But giving the wrong information and belittling PU’s service is totally a no-go.

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