If you are looking for a waterproofing contractor in Koto-ku, Tokyo,
please contact Kakeru Koumuten.
Kakeru Koumuten specializes in exterior renovations.
We receive many requests for waterproofing work for both single-family homes and apartment buildings in Koto-ku, Tokyo.
“Reasons why Kakeru Koumuten is chosen in Koto-ku”
“Costs of waterproofing work”“How to choose a waterproofing contractor”
“Subsidies and grants available for waterproofing work in Koto-ku”
We will explain these four points!
This will definitely be helpful for customers considering waterproofing work in Koto-ku, Tokyo, so please take a look!
Reasons why Kakeru Koumuten is chosen for waterproofing work in Koto-ku, Tokyo
Regarding why our company is entrusted with waterproofing work by customers in Koto-ku, Tokyo,
“Our strengths in waterproofing work that cannot be imitated by other companies”
have received high praise from many customers.
We have absolute confidence in “costs,” “quality,” and “plans,” so we would appreciate it if you could compare our estimates with those of other companies.
Because we are confident, we welcome competitive estimates!
1.Facilities Specialized in Exterior Renovation
Kakeru Koumuten Co., Ltd. has prepared the following warehouses and material storage areas to provide exterior renovations such as waterproofing at a lower cost and faster.
We have established 5 bases centered around Aoba-ku, Yokohama for material storage and showrooms.
In-House Scaffolding Materials
We own the scaffolding materials necessary for temporary scaffolding required for waterproofing work, allowing us to assemble temporary scaffolding in-house.
By conducting scaffolding work with our own scaffolding team instead of outsourcing, we can also reduce the costs associated with scaffolding work.
Since everything is handled in-house, we can significantly reduce costs by shortening the construction period!
We have enough scaffolding materials for approximately 50 single-family homes!
Storage of materials in our large in-house warehouse
We store roofing materials and waterproofing components.
By ordering a large quantity of materials at once, we can purchase materials at a lower cost!
Additionally, we always have waterproofing components in stock, allowing us to respond quickly to emergency waterproofing work!
In-house sorting of waste materials
In waterproofing work, various waste materials are generated.
Most contractors dispose of them all together, but by sorting and recycling waste materials, significant cost reductions in waste disposal can be achieved.
Exterior Renovation Dedicated Showroom
In our showroom, not only can you have meetings, but you can also directly check the actual structures and colors.
2．Complete In-House Construction
One of Kakeru Koumuten’s major strengths is complete in-house construction.
From inquiry to completion, everything is handled by Kakeru Koumuten Co., Ltd. This allows us to keep costs down while providing high-quality waterproofing work.
Additionally, one representative will assist you from the estimate to the completion of the project.
Since the same person will handle sales and construction management, smooth communication is possible.
We are confident in our construction plans and costs, so we welcome competitive estimates!
3. Various Permits and Skilled Workers
We have obtained permits for construction work and industrial waste collection and transportation!
We also have qualified professionals on staff, and we are confident in our construction techniques.
We can handle large-scale waterproofing projects, such as those for factories!
4. Warranty and Aftercare
Waterproofing work comes with a guarantee!
Depending on the type of waterproofing work, we provide a 5 to 10-year leak guarantee.
If you have any questions about the guarantee, please click on the image above!
In the unlikely event that leaks are not resolved after the waterproofing work, we will take responsibility and respond accordingly!
Additionally, aftercare maintenance is available every year, and we will send you a DM reminder for aftercare maintenance each year.
During aftercare maintenance, we will check the entire waterproofing system and assess the condition of any deterioration.
5. Flexible and Prompt Response
Our company is equipped to handle various troubles and situations.
If we cannot access the rooftop for waterproofing checks, we will utilize drones to assess the condition.
During leak investigations, we can also conduct inspections using thermal imaging cameras.
We will respond according to your wishes.
We also accept emergency measures for sudden leaks!
Since our sales and construction management are not separated, one dedicated representative will handle everything from the estimate to the completion of the work!
Changing representatives frequently can lead to miscommunication regarding the details and precautions of the work, which could cause issues, so we maintain a system where the representative remains the same.
6. Human Resource Development
To improve our skills, we create various building models and conduct practical training.
We regularly provide technical training to ensure that each staff member can handle various types of buildings.
Subsidies and Grants for Waterproofing Work in Koto-ku, Tokyo
Tax Reduction for Promoting Long Lifespan of Condominiums (Property Tax Reduction)
Requirements for Tax Reduction for Promoting Long Lifespan of Condominiums
Condominiums over 20 years old
Total number of units: 10 or more
Completion of long lifespan improvement work at least once in the past + completion of the second or subsequent work between April 1, 2023, and March 31, 2027
Condominiums with a management plan certification or those that have established or reviewed a long-term repair plan with advice and guidance from the municipality
The residential floor area of the exclusive portion occupies more than 50% of the total
Details of Tax Reduction
Eligible: Property tax on the building portion imposed in the year following the completion of the work.
Maximum Reduction: Up to equivalent to 100㎡ per unit
Tax Reduction Rate: The tax amount within the above range is reduced by 1/2 (50%)
Others
If damage caused by natural disasters is recognized, it may be covered by fire insurance.
In terms of waterproofing, examples of damage due to natural disasters include “holes in waterproof sheets caused by flying objects or falling debris from wind disasters.”
If you are unsure whether it is covered by fire insurance, please feel free to contact us!
About the Cost of Waterproofing Work
⇧ For construction menu | Click here for information on waterproofing costs
Customer Testimonials
カテゴリ ‘voice’ は見つかりません
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customer reviews
Asao-ku, Kawasaki City | We received reviews about the ridge cap and rain gutter replacement work!
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customer reviews
Kohoku-ku, Yokohama | We received reviews about the roof overlay (cover method)!
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customer reviews
Kohoku-ku, Yokohama | We Received Reviews About Exterior Painting!
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customer reviews
Aoba-ku, Yokohama | We received reviews about our exterior fence construction!
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customer reviews
Tsurumi-ku, Yokohama | We received reviews about roof and exterior wall painting, as well as metalwork and rain gutter replacement work!
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customer reviews
Higashiyamato City, Tokyo | We received reviews about exterior painting and roof overlay (cover method)!
Examples of Waterproofing Work
| Construction Details |
| Polyurethane waterproofing ventilation buffer method / High-strength polyurethane type Existing waterproofing: PVC sheet waterproofing |
| Materials Used |
| Waterproofing: AGC polymer building materials / Saracene A (high-strength polyurethane) Ventilation sheet: QV sheet Vent pipe: Made of stainless steel Replaced with a renovation drain |
| Price Range |
| 700,000 to 800,000 yen |
| Construction Period |
| Approximately 2 weeks |
| Completion Month |
| May 2024 |
| Inquiry Details |
| We have received the following inquiries from our customer: ・There are wrinkles and bulges in the waterproof sheet on the rooftop, so I am worried about leaks. ・I would like an estimate for a complete waterproof renovation, not just partial repairs or a top coat. ・I learned that urethane waterproofing has high waterproofing properties, so I would like an estimate for urethane waterproofing. ・Since this is my first waterproofing project, I would like to compare estimates. |
Our Proposal
Since you mentioned wanting to renovate using a long-lasting method rather than just protective agents like top coats, we proposed a complete “urethane waterproofing project” for the rooftop.
If urethane waterproofing is applied using a direct adhesion method, air rising from the building can cause bulges in the waterproof layer, so we proposed the “urethane waterproofing ventilation buffer method.”
The ventilation buffer method involves applying a ventilation buffer sheet over the entire area before applying urethane waterproofing.
By applying the ventilation buffer sheet first, the air rising from the building is suppressed by the ventilation sheet and expelled through the “ventilation pipe.”
This can prevent the most common problem with waterproofing, which is bulging in the waterproof layer!
After explaining the materials and methods, we were entrusted with the project among four competing estimates!
Timing for Waterproofing Work
Leaks Have Already Occurred
If leaks have already occurred, it is necessary to address the issue promptly before the damage worsens.
If left unattended, it can negatively impact the interior and underlying structures, so it is essential to stop the leaks quickly.
Bulges or Cracks in the Waterproof Layer
If there are cracks in the waterproof area, it can lead to rainwater intrusion.
If the waterproof layer is bulging, it indicates that moisture is accumulating within the waterproof layer.
Bulges can lead to cracks, which can result in leaks, so early detection and action are necessary.
Moss or Mold Growth
Moss or mold can develop due to accumulated moisture or rainwater.
This can be caused by inadequate drainage or sinking of the waterproof layer due to aging.
Exceeding the Durability Period
Generally, the durability period for waterproofing work is 10 to 20 years.
Of course, the durability period can vary depending on the construction method and materials, but for some types of waterproofing, it is recommended to apply only the surface protective agent (top coat) approximately every 8 years (such as urethane waterproofing or FRP waterproofing).
We recommend regular inspections starting from 5 years after construction.
Understanding the types of waterproofing and performing appropriate maintenance is essential.
If you are unsure about the type of waterproofing, please send us a photo via email or LINE, and we will help you determine it!
Types of Waterproofing Work
1. Urethane Waterproofing
Urethane waterproofing is a method that involves applying liquid polyurethane resin onto the waterproofing surface.
Since it is liquid before curing, it can be applied to complex shapes, and unlike sheet waterproofing, it can be installed without seams, which is a significant advantage. It can be widely applied to balconies and rooftops.
For more details on the advantages, disadvantages, and maintenance methods of urethane waterproofing, please refer to the article below.
For more information on waterproofing work | Urethane waterproofing, click here!
2. Rubber Sheet Waterproofing
Rubber sheet waterproofing involves adhering synthetic rubber sheets to the surface to prevent water intrusion.
This type of waterproofing is commonly used for large areas such as rooftops.
Compared to urethane waterproofing, it has the advantage of faster installation since there is no waiting for drying, but it is not suitable for complex surfaces.
For more details on the advantages, disadvantages, and maintenance methods of rubber sheet waterproofing, please refer to the article below.
For more information on waterproofing work | Rubber sheet waterproofing, click here!
3. PVC Sheet Waterproofing
PVC sheet waterproofing is a waterproof sheet made of polyvinyl chloride, which, like rubber sheet waterproofing, is applied to the surface to prevent water intrusion.
Like rubber sheets, it is not suitable for complex shapes. Although the cost is higher than rubber sheets and urethane waterproofing, its long durability is a significant advantage.
For more details on the advantages, disadvantages, and maintenance methods of PVC sheet waterproofing, please refer to the article below.
For waterproofing work | Click here for information on PVC sheet waterproofing!
4. Long Sheet Waterproofing
Long sheet waterproofing, officially known as “anti-slip vinyl flooring sheet,” is commonly used in shared areas and staircases of apartments where people walk.
As the name suggests, it is slip-resistant and has high durability and abrasion resistance, making it suitable for walking areas.
Additionally, it comes in various designs, excelling in aesthetic appeal.
However, it tends to be more expensive, and since it does not overlap seams like rubber sheets or PVC sheets, it may give a slightly lower impression of waterproofing capability.
It is rarely used in areas like apartment rooftops where people do not frequently enter.
For more details on the advantages, disadvantages, and maintenance methods of long sheet waterproofing, please refer to the article below.
For waterproofing work | Click here for information on long sheet waterproofing!
5. FRP Waterproofing
FRP waterproofing involves creating a waterproof layer by hardening glass mat with epoxy resin to prevent rainwater intrusion.
It is commonly applied in single-family home balconies, with an overwhelmingly short construction period, often completed in as little as one day.
Due to its lightweight and low cost, it seems that about 80% of single-family home balconies use FRP waterproofing.
However, it is not suitable for installation on large areas, making it less appropriate for rooftops.
For more details on the advantages, disadvantages, and maintenance methods of FRP waterproofing, please refer to the article below.
Waterproofing Work | Click here for FRP Waterproofing!
6. Asphalt Waterproofing
Asphalt waterproofing is a waterproof sheet that has asphalt permeated into synthetic fiber non-woven fabric.
The waterproofing shown in the photo is a method where asphalt waterproofing is pressed down with cinder concrete.
This type of waterproofing is used in buildings with large areas, such as rooftops of schools and commercial facilities.
While there are various methods of asphalt waterproofing, each with its own advantages and disadvantages, a significant benefit is its high durability.
For more details on the advantages, disadvantages, and maintenance methods of asphalt waterproofing, please refer to the article below.
Waterproofing Work | Click here for Asphalt Waterproofing!
How to Choose a Waterproofing Contractor
There are many waterproofing contractors available in Koto-ku, Tokyo.
Among the numerous contractors, I believe many people feel “I don’t know who to ask for help…”.
Choosing the right contractor can be challenging at first, so I will explain 5 points to keep in mind when requesting waterproofing work.
● Have extensive experience in waterproofing work
● Confirm the availability of aftercare and warranty
● Obtain estimates from multiple contractors (at least 3 companies)
● Check if they perform waterproofing work in-house
● Carefully review the details of the waterproofing estimate, including processes and materials used
By confirming the above 5 points, you will be able to choose a reliable contractor.
Confirm if they have extensive experience in waterproofing work
About 10-20% of waterproofing work troubles are caused by construction defects during the installation.
To prevent troubles, it is important to hire a contractor that is experienced and trustworthy!
You need to refer to the contractor’s website for their construction achievements and reviews to make a judgment.
There are also contractors who showcase their achievements on social media platforms like Instagram, so checking those can be effective!
It is also effective to look at waterproofing companies on review sites for reference!
A particularly recommended review site is “Google”.
Since contractors cannot delete low ratings on their own, it provides reliable reviews.
If there are many negative reviews or no reviews at all, it may be wise to refrain from making a request.
Check if there is aftercare maintenance and construction warranty
In case of any construction defects or issues after the work is completed, let’s confirm if they provide a “construction warranty“!
Contractors who offer warranties are usually confident in their work, making them more trustworthy companies!
If waterproofing work is done, make sure to have photos taken of hidden areas and check them!
Check for leaks during rainy weather after the waterproofing work, and if there are any issues, contact the contractor immediately as it will facilitate smooth communication shortly after the work is completed!
Also, to detect issues early, confirm whether they will conduct thorough aftercare maintenance!
Since non-specialized contractors may not notice signs of problems or troubles, having a specialized contractor perform regular aftercare maintenance can prevent troubles before they occur!
Our company sends out aftercare maintenance DM every year, so if desired, annual aftercare maintenance is possible!
Obtain estimates from multiple contractors (at least three)
When requesting waterproofing work, always obtain estimates from multiple contractors.
We recommend obtaining estimates from at least three companies.
Even for the same waterproofing work, costs may vary between contractors, and warranties and after-services may differ as well.
Additionally, obtaining multiple estimates makes it easier to negotiate prices. To request at the lowest possible cost, it is essential to get estimates from several contractors.
When comparing estimates, check not only the costs but also the “types of materials used” and “construction methods” to compare in detail!
Confirm if they perform waterproofing work in-house
Let’s confirm whether we handle waterproofing work in-house!
If a sales company investigates and then requests a subcontractor, it can lead to extra time and costs.
Additionally, there may be instances where customer requests are not fully communicated to the subcontractor, which can lead to troubles.
By having one company handle everything from sales to construction, we can provide responsible waterproofing work that is quick and cost-effective. Kakeru Koumuten Co., Ltd. conducts everything from on-site surveys to actual construction in-house!
Furthermore, in the unlikely event of a leak or trouble, a company that employs its own craftsmen can respond to and resolve issues quickly!
Carefully check the details of the waterproofing estimate, process, and materials used
Even for the same waterproofing work, there are various types such as “methods,” “materials,” and “processes,” and it is necessary to use the optimal method and materials based on the construction location and existing substrate.
For example, even with the same urethane waterproofing, there are different types of processes such as “adhesion method” and “ventilated buffer method,” and there are various types of urethane waterproofing materials, including “high-strength specifications,” “heat-insulating specifications,” and “anti-slip specifications.” Therefore, it is essential to confirm whether the construction content is appropriate for the location!
It is important not to judge solely by cost but to carefully check whether “the method is appropriate for the substrate?” and “are the materials suitable?”
So, if the materials used are only “urethane waterproofing materials,” let’s confirm the product name and check what kind of materials they are!
If you are looking for a waterproofing contractor in Koto-ku, Tokyo, please contact Kakeru Koumuten Co., Ltd.
Our company has handled many waterproofing projects in Koto-ku, Tokyo.
Our greatest strength is that we can handle everything from proposals to temporary scaffolding setup and waterproofing work in-house!
Kakeru Koumuten Co., Ltd. promises “high-quality waterproofing work at low cost”, and we have received high praise from many customers.
We continue to update our construction performance every year, and we will strive to improve quality so that even more customers can be satisfied in the future.
We are also happy to handle small partial works!
In addition to waterproofing work, we can perform roofing work, exterior painting, and exterior cover methods, all in-house.
We are confident that we will not lose to other companies in terms of cost, quality, and efficiency in exterior construction!
We are so confident that we welcome competitive estimates!
Estimates are completely free, and if our company is found to be inferior to others, you are welcome to decline!
For exterior renovations in Koto-ku, Tokyo, click here!
For exterior painting in Koto-ku, Tokyo, click here!
For roofing renovations in Koto-ku, Tokyo, click here!
For leak repairs in Koto-ku, Tokyo, click here!
Features of Koto-ku, Tokyo
Koto-ku, Tokyo is located in the eastern part of Tokyo, bordered by the Arakawa River to the east, the Sumida River to the west, and facing Tokyo Bay to the south. The area is known as a “watercolor city,” surrounded by water and greenery, with over 50 kilometers of rivers and canals running through it. Additionally, the transportation network is well-developed, including JR lines, subways, and Tokyo buses, making it easy to access major tourist spots such as Tokyo Station, the Imperial Palace, Asakusa, and Tokyo Skytree, as well as Tokyo Disneyland within a 30-minute radius.
In the inland area of Fukagawa and Joto, traditions and culture from the Edo period remain vibrant, allowing visitors to experience festivals at shrines and temples, traditional performing arts, and the charm of old downtown. Meanwhile, in the southern bay area, large shopping and entertainment facilities like Toyosu Market are lined up, creating a futuristic urban landscape.
Furthermore, Koto-ku retains the rich history and culture of Edo, with crafts like Edo Kiriko and Kiba’s Kaku-nori, as well as the Fukagawa Hachiman Festival, while also advancing the development of new neighborhoods like Toyosu and Ariake in the coastal area, representing a new face of Tokyo. In 2018, Toyosu Market opened, and during the Tokyo 2020 Olympic and Paralympic Games, many competition venues were established in the coastal area, continuing to develop while leveraging both tradition and the future.
Thus, Koto-ku is an attractive area where beautiful landscapes created by water and greenery, streets alive with history and culture, and modern urban development converge. It is beloved by many as a destination for tourism and residence.
Our company offers a wide range of waterproofing services in Koto-ku. We can handle all exterior renovations, including waterproofing, roofing, and exterior painting, with our own skilled team.
If you have any concerns, please feel free to consult with us!
Waterproofing Service Areas
Kakeru Koumuten Co., Ltd. accepts requests throughout Kanagawa Prefecture and all of Tokyo.
List of Areas in Koto-ku, Tokyo
Aomi, Koto-ku / Ariake, Koto-ku / Ishijima, Koto-ku / Umibe, Koto-ku / Eitai, Koto-ku / Edagawa, Koto-ku / Echujima, Koto-ku / Oogibashi, Koto-ku / Oshima, Koto-ku / Kameido, Koto-ku / Kitasuna, Koto-ku / Kiba, Koto-ku / Kiyosumi, Koto-ku / Saga, Koto-ku / Sarue, Koto-ku / Shiohama, Koto-ku / Shiohama, Koto-ku / Shinonome, Koto-ku / Shirakawa, Koto-ku / Shindaibashi, Koto-ku / Shinkiba, Koto-ku / Shinsuna, Koto-ku / Sumiyoshi, Koto-ku / Sengoku, Koto-ku / Chida, Koto-ku / Takahashi, Koto-ku / Tatsumi, Koto-ku / Chuo Bouhatei, Koto-ku / Toyo, Koto-ku / Toyosu, Koto-ku / Higashisuna, Koto-ku / Hirano, Koto-ku / Fukagawa, Koto-ku / Fukuju, Koto-ku / Fuyuki, Koto-ku / Koishikawa, Koto-ku / Botan, Koto-ku / Minamisuna, Koto-ku / Miyoshi, Koto-ku / Mouri, Koto-ku / Morishita, Koto-ku / Monzen Nakacho, Koto-ku / Yumenoshima, Koto-ku / Wakasu, Koto-ku
Consultations via LINE are also very welcome◎
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AAA is a young company with an average age in the early 20s, but our technology is second to none.
One of our greatest strengths is that we can do all of our own scaffolding, roofing, and painting work. In this industry, where work is generally divided, we are able to provide a complete set of services, which saves time and effort in management and reduces costs. Above all, if there is any trouble, we will come to you right away!
We can confidently declare this. We are the youngest and most friendly renovator in Kanagawa!
