Roof Waterproofing Mistakes & How to Avoid Them
If you start seeing water seeping through your roof or noticing stains on your ceiling, you probably think about getting roof waterproofing done. But it's not uncommon for leaks to reappear in the same spot just a few years after the job is finished. Most of the time, the problem starts not with the actual construction skill, but with what you check before the job and how you define the scope.
In this post, we're going to point out the common pitfalls people miss when preparing for roof waterproofing. We'll cover what you should look for when getting quotes, how the construction method changes based on your current roof condition, and what you need to check after the finishing touches are done.
Mistake: Not Checking the Existing Waterproofing Layer Before Starting Roof Waterproofing
The most frequent mistake is just patching the leak where you see it. Water doesn't just come in at one spot; it flows along cracks or areas where the existing layer is lifting across the entire floor. So, if you only seal what's visible, it will likely start leaking somewhere else shortly after.
Before you hire anyone, you should check the following items:
- The location and length of any cracks on the floor surface.
- Any areas where the current waterproof layer is peeling or lifting.
- Where water pools and the condition around the drainage areas.
- The finishing around the connection points between the parapet walls and the outer walls.
If you move forward with construction without checking these things, you might end up paying for a job that doesn's actually solve your problem.
Mistake: Comparing Roof Waterproofing Quotes Based Only on Area
When you get quotes for roof waterproofing, it's easy to compare them using a price per square meter. However, even if the area is the same, the final result can vary wildly depending on the scope of work and the materials used. Whether they are stripping the old layer down completely and applying a new one, or just applying a top coat, the amount of work is totally different.
When reviewing a quote, make sure it clearly states the following:
- Whether the existing waterproofing layer needs to be removed and the extent of that removal.
- The specific type of waterproofing material and how many coats will be applied.
- How they plan to handle any cracks or issues around the drains.
- Whether the final coating/finish is included and what the warranty period is for defects.
Even if a price looks low, if it leaves out necessary demolition or repair work, you could face unexpected extra costs down the line.
Confusing Epoxy Coating with Urethane Waterproofing: Know the Difference
When finishing a rooftop, epoxy coatings and urethane waterproofing serve different purposes. Urethane excels because of its flexibility, allowing it to absorb minor movements in the floor. Epoxy, on the other hand, is hard and highly resistant to wear, making it perfect for high-traffic areas or spots that bear heavy loads. If you apply one material to everything without distinguishing between them, it might not match how you plan to use the roof.
The first step is to decide how you'll use the rooftop, and then choose materials that fit that purpose.
Thinking Waterproofing Injection is a One-and-Done Fix
Waterproofing injection works by injecting sealing agents into cracks to block water flow. This can be helpful if water is seeping up through walls or the floor. However, if the entire waterproofing layer is aged and has failed, injection alone won't cut it. You need to accurately pinpoint the source of the leak before deciding which method is appropriate.
Mistakes to Avoid: Skipping Final Inspection After Finishing
Once the work is done, you might be eager to start using the roof right away, but you still need a thorough final check. It's crucial to verify that the coating thickness is even, that the surface isn't bumpy, and that there are no gaps around drains or connections. A good test is to pour water over the surface to see if any pooling occurs.
Frequently Asked Questions About Rooftop Waterproofing
How Should I Compare Rooftop Waterproofing Estimates?
Don't just compare the square footage and the unit price. You should compare everything on the same playing field: the scope of demolition, the type of waterproofing material used, the repair items included, and the warranty terms. If a quote is missing key items, it's likely to lead to extra costs later.
What Factors Affect the Cost of Rooftop Waterproofing?
The cost changes significantly depending on whether you have to remove the existing waterproofing layer, how much crack repair is needed, and what materials and finishing methods the contractor uses. The safest bet is to get quotes from several companies after they inspect the site to get a clear idea of the pricing.
When Should I Re-do My Rooftop Waterproofing?
You should look into maintenance if you notice recurring cracks in the floor, if the waterproofing layer starts lifting or peeling, or if you frequently see stains on the ceiling. Catching the issue when it's small can drastically reduce the scope of repairs needed.
If you're thinking about getting your roof waterproofed, start by taking photos of the current floor condition and writing down exactly where and when you notice leaks. Taking those records to get quotes from two or three different companies will give you a much clearer picture of what needs to be done.