

Hello!
We are Kakeru Koumuten Co., Ltd., a specialist in roofing, exterior painting, and exterior renovations located in Aoba-ku, Yokohama, Kanagawa Prefecture!
This is a case study of exterior renovations in Asao-ku, Kawasaki City, Kanagawa Prefecture.
The work involved replacing the rain gutters and ridge flashing!
We received an inquiry about water leakage from the rain gutters, and upon inspection, we found multiple deformations in the rain gutters and fittings, so we proposed a rain gutter replacement.
On this page, we will explain the actual results of the work carried out by Kakeru Koumuten!
Thank you very much for choosing Kakeru Koumuten Co., Ltd. from among many contractors.
目次
- 1 Asao-ku, Kawasaki City – Construction Data
- 2 Procedure for Replacing Ridge Cap
- 3 Rain Gutter Replacement Construction Procedure
- 3.1 1. Dismantling Existing Eaves Gutter
- 3.2 2. Installing New Eaves Support Brackets
- 3.3 3. Installing Eaves Gutter
- 3.4 4. Connecting to Downspout
- 3.5 5. Water Flow Test and Cleaning
- 3.6 Watch the video about Kakeru Koumuten’s ridge cap replacement
- 3.7 Basics of Rain Leak Repair
- 3.8 Cost Estimates for Roof Repairs
- 4 Leave Your Exterior Renovation in Asao-ku, Kawasaki to Kakeru Koumuten!
- 5 Summary
Asao-ku, Kawasaki City – Construction Data
| Construction Location |
| Aso-ku, Kawasaki |
| Work Details |
| Temporary Scaffolding Roof Repair and Maintenance (Ridge Cap) Rain Gutter Replacement |
| Inquiry Details |
| I was concerned about leaks from the roof, and considering my budget, I thought I would request work for replacing the ridge cap this time. |
| Materials Used |
| Rain Gutter: Panasonic PC50 |
| Price Range |
| 500,000 – 600,000 |
| Construction Period |
| Approximately 2 weeks |
| Completion Month |
| September 2023 |
Procedure for Replacing Ridge Cap
The ridge cap is the metal covering that protects areas of the roof where roofing materials cannot be laid, such as at the peak of the roof.
It is susceptible to damage from wind disasters and can cause leaks.
1. Dismantling the Existing Ridge
It is recommended to replace the wooden batten inside every 10 to 15 years.
Once the ridge cap is removed, there will be a batten inside.
2. Installing New Batten
Once it is laid up to the ridge, we will install the necessary materials to secure the ridge cap, known as the batten. We offer three types of battens: cedar, resin, and Galvalume steel, and this time we used the resin type!
Resin-based ridge boards can be expected to have three times the durability compared to cedar!
Galvalume steel ridge boards have a durability of about 30 to 35 years, making them highly durable and unlike resin or cedar, they do not crack!
3. Installation of New Ridge Flashing
We will process and install at the ends and joints! The joints and wall edges will be waterproofed with sealing. [/chat]
4. Clean Up and Completion!
We will thoroughly clean up any nails or debris that have fallen on the ground or in the rain gutters, marking the completion of the work! [/chat]
What is Ridge Flashing?

Ridge flashing is a metal plate installed at the top of the roof that protects the junction between roofs and serves to prevent rainwater intrusion. It is located at the highest point of the roof and is susceptible to direct sunlight and rain and wind.
◇ Lifespan of Ridge Flashing
The typical lifespan of ridge flashing is about 15 to 20 years, but with regular maintenance, it may last longer. However, it can vary significantly depending on environmental conditions and construction quality, so if you have concerns, it might be a good idea to check with a contractor or expert.
◇ Causes of Deterioration of Ridge Flashing
One of the main causes of deterioration in ridge flashing is direct sunlight from the sun, which can cause rust or deformation of the metal parts.
Additionally, cases where moisture causes the underlying material to rot can also occur.
◇ What Happens if Damaged Ridge Flashing is Left Untreated…
One common case is when the ridge cap is blown away by strong winds. Additionally, there may be instances of leaks from the ridge area, so if you have concerns, we recommend checking with a contractor or similar professional.
Currently, there are also materials called 【ventilation ridge】 to help release moisture.
For more information about ridge caps, please click here!
Rain Gutter Replacement Construction Procedure
1. Dismantling Existing Eaves Gutter

We will carefully remove the eaves gutter and brackets to avoid damaging the
fascia board!
2. Installing New Eaves Support Brackets
It is important to note that due to the fascia board (where the eaves support brackets were attached) or building distortions, even if the slope is set with brackets, there may be backflow. It is essential to check the slope with a level against the fascia board before attaching the brackets!
3. Installing Eaves Gutter
4. Connecting to Downspout
5. Water Flow Test and Cleaning
Finally, we will conduct a water flow test and clean up to complete the job!
For the eaves gutter, we used Panasonic/PC50.
It has a steel plate inside, providing strength.
Colors
■ Milk White

■ Pearl Gray

■ Modern Beige

■ Oak Brown

■ Shincha

■ Black

This time, we completed the replacement work beautifully in Black!
The customer was very satisfied!
Thank you very much!
Watch the video about Kakeru Koumuten’s ridge cap replacement
Basics of Rain Leak Repair
Roof work after rain leak repair is necessary to prevent the recurrence of leaks and to maintain the overall durability and safety of the building.
◇ Limitations of DIY Rain Leak Repair
While rain leak repair may seem manageable on your own, it is merely a temporary fix. The causes of leaks are varied, and repairs must be tailored to those specific causes. Additionally, factors such as roofing materials, shapes, and surrounding environments must also be considered. A challenge when attempting DIY rain leak repairs is the lack of necessary tools and skills, which can potentially worsen the situation. Moreover, climbing onto the roof itself can be dangerous.
Therefore, we recommend that you request rain leak repairs from a contractor with specialized knowledge and skills.
◇ Cases Where It’s Better to Hire a Professional for Rain Leak Repairs
There are many situations where you may want to hire a professional.
・The cause of the rain leak cannot be identified
The causes of rain leaks can vary widely, including deterioration, cracks, or holes in the roof itself and lifting or misalignment of ridge flashing. It is difficult to identify the cause through visual inspection alone, and a judgment based on specialized knowledge and experience is required.
・The repair location is at a high place
Working at heights involves risks, so for safety reasons, we strongly recommend hiring a professional.
・Rain leaks are occurring in multiple locations
When rain leaks occur in multiple places, appropriate repair methods for each location are required. Expert judgment and skills are necessary.
If the rain leak is serious or if self-repair is difficult, it is advisable to promptly contact a specialized contractor.
Cost Estimates for Roof Repairs
◇ Cost Estimates for Roof Repairs
The cost estimate for roof repairs is said to be around 200,000 to 1,000,000 yen. However, costs can vary depending on the repair content, scope, and materials used. For example, minor repair work such as replacing tiles or ridge replacement may cost around 20,000 to 100,000 yen, while larger projects like roof overlay work or complete roof replacement can exceed 400,000 to 1,000,000 yen. Obtaining estimates from multiple contractors can help you understand reasonable costs and serve as a reference when choosing a cost-effective contractor.
◇ Cost Estimates for Simultaneous Construction
In the case of simultaneous construction, overall cost reductions are expected. Since project scheduling and personnel allocation can be handled at once, work efficiency increases, allowing for cost savings.
Generally, it is said that overall construction costs can be reduced by about 10 to 20%. For example, if exterior wall painting costs 1,000,000 yen and roof repairs cost 1,000,000 yen separately, the total would be 2,000,000 yen. However, simultaneous construction could potentially reduce this to around 1,800,000 yen.
Leave Your Exterior Renovation in Asao-ku, Kawasaki to Kakeru Koumuten!
Our company is based in Aoba-ku, Yokohama, but we also have extensive experience in exterior renovations in Asao-ku.
We are happy to assist with partial repairs such as rain gutter replacement, cleaning, painting, and repairs.
If you have any questions or concerns, such as “I just want to know the estimate for the rain gutters” or “I want to know more about the materials for the rain gutters”, please feel free to contact us!
Community-Focused Service
As a local exterior renovation company in Aoba-ku, Yokohama, we handle many projects in Asao-ku, deeply understanding the needs of our community customers. Whether you want a renovation that lasts a long time or to keep costs down, we provide optimal solutions for your specific requests.
List of Areas in Asao-ku, Kawasaki
Aso-ku, Ozenji / Aso-ku, Ozenji Nishi / Aso-ku, Ozenji Higashi / Aso-ku, Okakami / Aso-ku, Katahiru / Aso-ku, Kanemoto / Aso-ku, Kamiasao / Aso-ku, Kuriki / Aso-ku, Kurikidai / Aso-ku, Kurihira / Aso-ku, Kurokawa / Aso-ku, Goritada / Aso-ku, Shimoasao / Aso-ku, Shiratori / Aso-ku, Takaishi / Aso-ku, Tamabi / Aso-ku, Chiyogaoka / Aso-ku, Nijigaoka / Aso-ku, Hakusan / Aso-ku, Hayano / Aso-ku, Haruhino / Aso-ku, Higashiyurigaoka / Aso-ku, Furusawa / Aso-ku, Hosoyama / Aso-ku, Manpukuji / Aso-ku, Minamikurokawa / Aso-ku, Mukuhara / Aso-ku, Yurigaoka
Summary
Estimates and inspections are, of course, free! If you have any concerns regarding roofs, rain gutters, exterior walls, or exteriors, please consult Kakeru Koumuten Co., Ltd. in Aoba-ku, Yokohama!
Kakeru Koumuten is a remodeling company strong in exterior renovations, and we carry out everything from temporary scaffolding work to roof work and exterior painting completely in-house.
We are confident that our “cost, quality, and smooth process” are unmatched compared to other companies in exterior renovation work!
We are confident in our exterior renovations, so we welcome competitive estimates!
We offer comprehensive construction guarantees and aftercare maintenance, and we have received positive feedback for our appropriate proposals that align with cost performance and our customers’ future life plans!
“I’m glad I asked them!” We take every request seriously to ensure you feel this way.
We also have information on roofing costs and pricing plans for roof overlay (cover method), so please take a look if you’re interested!
We look forward to your inquiries. Thank you very much.
Useful information about exterior renovations can be found here!
・Atsugi-ku, Yokohama | Rain Gutter Replacement | We performed exterior renovations through rain gutter repairs!
・Asao Ward, Kawasaki | Roofing Work | We performed roof overlay using Super Galtect!
・Asao Ward, Kawasaki | Roofing Work | We performed roof overlay using Super Galtect!
・Painting DIY Plan! A must-see for those who want to try DIY roof and exterior wall painting! We will only set up the scaffolding!
・Rain leaks from the rain gutter… We will introduce possible causes and how to deal with them!
・About the costs of roof overlay | Kakeru Koumuten’s roofing plans!
・About the costs of exterior wall painting | Kakeru Koumuten’s exterior wall painting plans!
・About the costs of leak repairs | Kakeru Koumuten’s leak repair plans!
・Ridge Cap Replacement | About the costs of face plaster | Kakeru Koumuten’s construction plans!
・Is painting rain gutters really necessary? We will introduce the benefits and drawbacks!
・Where should you request rain gutter repairs? We will introduce how to choose a reliable contractor!
・Renovation store in Kanagawa Prefecture, Yokohama | What is roof overlay (roof cover method)?
LINE consultations are also very welcome◎
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!



