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“What is urethane waterproofing?”
Many people may have this question.
If you are considering waterproofing work using urethane waterproofing, you need to have specific knowledge to confidently entrust the work.
In this article, we will explain in detail the methods of urethane waterproofing, advantages, and disadvantages.
What is Urethane Waterproofing? Two Representative Methods
Urethane waterproofing involves applying liquid urethane resin to the substrate using:
・Brush
・Trowel
・Roller
・Rubber spatula
This process forms a waterproof membrane on the substrate.
There are two methods of urethane waterproofing:
Adhesive Method
The adhesive method refers to the technique of applying urethane directly to the substrate.
After applying the urethane, a mesh reinforcement material is attached, and additional layers of urethane resin are applied until a certain thickness is achieved, followed by a top coat to finish.
The adhesive method has the advantage of being completed in a relatively short period, making it easier to reduce costs.
However, caution is needed if there is moisture in the area where the urethane is applied, as water vapor can cause the waterproof layer to swell when exposed to sunlight.
Ventilated Buffer Method
If you are going to apply waterproofing to areas that are already waterlogged, we recommend the Ventilation Buffer Method.
This method is ideal for rooftops and balconies with a concrete base!
In the Ventilation Buffer Method, a sheet is applied over the base, and then urethane is coated on top of it.
While this method is more expensive than the previously explained bonding method, it makes it easier to prevent “blistering due to water vapor,” making it a good choice for those who prioritize quality.
What are the benefits of urethane waterproofing?
Next, let’s take a closer look at the benefits of urethane waterproofing.
No seams
With urethane waterproofing, since liquid urethane resin is applied, it can be finished without creating seams.
When there are seams, if that part peels off, it is more likely to leak, but with urethane waterproofing, there is no such concern.
This method is optimal for those seeking high waterproofing performance.
Can accommodate any shape
One type of waterproofing work is called sheet waterproofing.
With sheet waterproofing, it is necessary to cut and paste sheets, which may not be suitable for complex areas.
However, with urethane waterproofing, since liquid urethane is applied, it can be smoothly applied even to complex shapes.
Easy maintenance
Urethane waterproofing is also quite easy to maintain.
This is because you only need to apply another layer on top.
Of course, if you are going to reapply urethane waterproofing, you will need to perform high-pressure washing to remove dirt, but there is no need to strip off the old waterproof layer, so maintenance can be completed in a short period.
Reduces the Burden on Buildings
Polyurethane resin is a very lightweight material, making it less likely to put a load on buildings.
“That much won’t damage the building, right?”
Some may think this way, but using heavy materials or heavy sheets can actually reduce the durability of the building.
If you want to carry out waterproofing work while maintaining the durability and lifespan of your building, consider using polyurethane waterproofing.
What are the Disadvantages of Polyurethane Waterproofing?
Next, let’s take a closer look at the disadvantages of polyurethane waterproofing.
The Finish Depends on the Craftsman’s Skill
As mentioned earlier, the quality of polyurethane waterproofing depends on the skill of the craftsman.
If an unskilled craftsman performs the work, unevenness can occur, preventing it from fulfilling its intended role.
When choosing polyurethane waterproofing, make sure to select a contractor with experienced and skilled craftsmen.
Please check out Kakeru Koumuten’s painting and waterproofing work results here!
High Maintenance Frequency
Polyurethane waterproofing has lower durability compared to other methods.
While other methods can last around 10 to 20 years, with polyurethane waterproofing, it is necessary to reapply the topcoat every 5 years.
If regular maintenance is not performed, the topcoat will deteriorate, leading to a decrease in waterproofing function, so be sure to perform maintenance at the appropriate time.
What is the Cost Range for Polyurethane Waterproofing?
The cost range for polyurethane waterproofing is
typically between 4,000 yen and 7,000 yen per square meter, and the amount may vary depending on the work area and the contractor you choose.
Maintenance costs are around 1,800 yen to 3,000 yen per square meter, which can help reduce costs compared to the initial application.
That said, maintenance costs can vary by contractor, so it is recommended to obtain multiple estimates.
Summary
Polyurethane waterproofing refers to the construction method of applying polyurethane resin to create a waterproof layer.
There are several other types of waterproofing work, but polyurethane waterproofing can be done easily and at a low cost, making it a good option if you have budget constraints.
Regarding the costs of polyurethane waterproofing, there can be variations among contractors, so let’s select a contractor after obtaining estimates from multiple companies.
Our company, Kakeru Koumuten Co., Ltd., also offers polyurethane waterproofing services.
・Just an estimate
・Just a consultation
We welcome both, so please feel free to contact us!
For more helpful information on other exterior renovations, click here!
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・Exterior wall cleaning construction plan that does not require temporary scaffolding installation!
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