Hello!
We are Kakeru Koumuten Co., Ltd., a specialist in roofing, exterior wall painting, and exterior renovations located in Aoba-ku, Yokohama, Kanagawa Prefecture!
This is a case study of an exterior renovation project in Asao-ku, Kawasaki City.
The work involved a roof overlay (cover method) using Pamir and Super Galtect!
We implemented leak prevention measures on the existing roofing materials with Nichiha roofing work!
This residence also requested exterior wall painting at the same time!
Thank you very much for choosing Kakeru Koumuten Co., Ltd. from among many contractors.
Construction Data for Asao-ku, Kawasaki City
Roof Overlay Construction Procedure
1. Existing Roof Ridge Flashing
2. Installing Roofing (Waterproof Sheet)
Tadis Self Cover is said to have about three times the durability of regular asphalt roofing. It is a self-adhesive roofing material specifically designed for covering brittle roofing materials.
If the existing roofing material is non-asbestos materials such as Pamir or Colonial NEO, we recommend Tadis Self Cover.
As long as the roofing is solid, it will prevent leaks as a primary waterproofing measure!
We will securely adhere it to prevent it from blowing away.
3.Accessory Processing (Karakusa, Keraba, Valley)
The accessories used are genuine Galtect accessories made of SGL copper plate!
4. Main Construction (Aiji Industrial/Super Galtect)
Once the roofing is completed up to the ridge, we will install necessary materials called “kanban” to secure the ridge metal. We offer three types of kanban: cedar, resin, and galvalume steel, and this time we used the resin type!
The resin kanban is expected to have three times the durability of the cedar type!
The durability of the galvalume steel kanban is about 30 to 35 years, which is highly durable and does not crack like resin or cedar!
5. Ridge Metal Processing and Sealing at Various Locations
We use stainless steel nails and screws that are resistant to rust!
6. Cleaning
About Roofing Materials
The roofing material used is Aijii Industry’s Super Galtect.
Super Galtect comes with a manufacturer warranty of 15 years for the coating and 25 years for perforation.
Our company also provides a 10-year construction warranty!
It is made of SGL steel plate, which is also resistant to rust.
Insulation material is tightly applied from edge to edge of the roofing material, creating a metal plate that integrates steel and insulation.
When installed, insulation is applied even to the parts where the roofing materials overlap, and the surface is coated with a high heat-reflective paint, allowing for a cool summer and warm winter experience.
Additionally, it has soundproofing properties, reducing the sound of rain.
Moreover, it is lighter compared to other roofing materials, which reduces the sway during earthquakes, making it a good earthquake countermeasure.
It excels in finish, durability, insulation, soundproofing, and wind resistance, and our company’s installation records show that Aijii Industry’s Super Galtect is the most commonly used and is highly regarded!
Color
■Shade Black
■Shade Brown
■Shade Blue
■Shade Moss Green
■Shade Charcoal
■Shade Wine Red
You can choose from these 6 colors!
This time, we completed the cover work with Shade Brown, and it turned out exceptionally well!
The customer was very satisfied, and I was also very happy!
Thank you very much!
Details of the roofing material used this time
| Roofing Material |
|
|---|---|
| Manufacturer Warranty | Coating 15 years, Red rust 20 years, Puncture 25 years |
| Expected Durability | About 40 years |
| Color Used This Time |
Shade Brown
|
What is the Roof Overlay (Cover Method)?
The roof overlay (cover method) involves leaving the existing roof almost intact and placing a new roof on top of it.
Literally, it is a method of covering a roof with another roof. Therefore, the roof becomes double-layered. Since the roof is laid over, it is also referred to as “overlapping roofing.”
Advantages of the Overlay Method
Since a “new roof” is placed over the “existing roof,” demolition work is almost unnecessary, meaning that very little waste is generated.
This is its biggest feature, leading to various advantages.
The only parts that require demolition and waste disposal are the ridge caps, making it more cost-effective compared to complete roof replacement.
In 2004, regulations regarding the concentration of asbestos in raw materials were changed (for more details, please refer to the Ministry of Health, Labour and Welfare website).
Some building materials used in constructions completed before 2004 contain asbestos. Asbestos-containing materials are difficult to demolish due to their high environmental impact, resulting in high costs for both demolition and waste disposal. The overlay method, which generates almost no waste, is ideal for such roofs.
Some may wonder, “Is it safe to live in a building with asbestos-containing materials?” but rest assured. As long as there is no destruction or crushing, it will not disperse into the air.
If you are unsure about the type of roof on your home, please feel free to consult us.
Additionally, it can be completed in a shorter time frame compared to painting or full replacement. A shorter construction period means lower labor costs, which in turn makes the overall cost cheaper.
The psychological anxiety of having to live in an unusual environment is also reduced.
When scaffolding is set up, there may be inconveniences such as difficulty entering and exiting or being unable to open windows. Being able to return to normal life in a short period is a significant advantage.
Our company specializes in roofing work, and the roof overlay (cover method) is the most frequently performed service we offer. We are very grateful that we are continuously able to carry out roof overlay (cover method) projects without interruption.
Basics of Leak Repair
Roof work after leak repairs is necessary to prevent the recurrence of leaks and to maintain the overall durability and safety of the building.
◇ Limitations of DIY Leak Repairs
While it may seem that leak repairs can be handled on your own, they are 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 of performing DIY leak repairs is that you may lack the necessary tools and skills, which could worsen the situation. Moreover, climbing onto the roof itself can be dangerous.
Therefore, we recommend hiring a professional with specialized knowledge and skills for leak repairs.
◇ Cases Where It’s Better to Hire a Professional for Leak Repairs
There are many situations where you would want to hire a professional.
・When the cause of the leak cannot be identified
The causes of leaks can include deterioration, cracks, or holes in the roof itself and lifting or misalignment of ridge flashing, among others. It is difficult to identify the cause through visual inspection alone, and a judgment based on specialized knowledge and experience is required.
・When the repair area is at a height
Working at heights involves risks, so for safety reasons, we strongly recommend hiring a professional.
・When leaks are occurring in multiple areas
Leaks from multiple locations require appropriate repair methods for each area. Expert judgment and skills are necessary.
If the leaks are serious or if DIY repairs are challenging, 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 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 fair costs and serve as a reference when choosing a cost-effective contractor.
◇ Cost Estimates for Simultaneous Work
In the case of simultaneous work, overall cost reductions are expected. Scheduling and personnel allocation can be managed at once, improving work efficiency and 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 also cost 1,000,000 yen, doing them separately would require 2,000,000 yen. However, simultaneous work could potentially reduce that to around 1,800,000 yen.
Post-Construction Maintenance
◇Importance of Maintenance After Construction
Maintenance after exterior painting and roof repairs is a crucial factor in extending the lifespan of your home. Neglecting maintenance can lead to the newly painted exterior and repaired roof deteriorating quickly, resulting in the risk of incurring high costs. The exterior walls and roof of a building are constantly exposed to harsh natural environments such as rain, wind, UV rays, and temperature changes. Regular maintenance can minimize damage and help maintain the beauty and comfort of your home. Additionally, it can help avoid large-scale repair work and the associated significant expenses.
◇Maintenance Methods and Frequency
One effective maintenance method after construction is inspections by professional contractors. This allows for early detection and repair of even minor damage. The recommended frequency for maintenance is generally exterior painting every 5 years and roof repairs every 3 years. This is just a guideline and may vary based on local climate conditions and the structure of the house.
Frequently Asked Questions About Roof Overlay (Cover Method)
What types of roofs are suitable for the roof overlay (cover method)?
→ The roof overlay (cover method) is suitable for slate roofs and metal roofs. If there is significant damage to the existing roof or if the underlayment is deteriorated, this method may not be appropriate.
In such cases, other measures such as roof replacement may be necessary.
Click here for information on roof replacement work
What is the best season to perform the roof overlay (cover method)?
→ The roof overlay (cover method) is best performed in stable weather during spring or autumn. It is advisable to avoid the rainy season and the cold winter months.
Is it possible to use the roof overlay (cover method) if there is rust on the existing roof?
→ If the rust is minor, it is possible to perform the roof overlay (cover method) after removing the rust. However, if the rust is advanced, it may not be possible, so it is recommended to consult with a contractor.
Can the roof overlay (cover method) be done as a DIY project?
→ The roof overlay (cover method) requires specialized skills and knowledge, making it difficult to do as a DIY project. It is recommended to hire a professional contractor.
What maintenance is required after the roof overlay (cover method)?
→ Regular inspections and maintenance are still necessary after the roof overlay (cover method). In particular, cleaning of the rain gutters and removal of leaves and debris is required.
How does the roof overlay (cover method) affect the asset value of the building?
→ The roof overlay (cover method) can improve the condition of the roof, potentially increasing the asset value of the building. However, the overall condition of the building and other factors should also be considered, so it is advisable to check with a contractor.
Please check out our other roofing project achievements here!
Leave your roof renovation in Aso-ku, Kawasaki to Kakeru Koumuten!
We have extensive experience in roof renovations in Aso-ku, Kawasaki.
We are happy to assist with everything from roof overlay work, roof replacement, to partial roof repairs such as leak fixes.
If you have any questions like “I just want to know the estimate for the roof renovation” or “I want to know about roofing materials,” please feel free to contact us!
Community-focused Service
As a home renovation company based in Aoba-ku, Yokohama, we have handled many roof renovations in nearby Aso-ku, Kawasaki, and we deeply understand the needs of our local customers.
“I want it to last long with just one renovation”
“I want to keep costs as low as possible”
“I want to improve insulation because the indoors are hot”
We provide optimal solutions for specific requests like these.
List of Areas in Aso-ku
Aso-ku Ozenji / Aso-ku Ozenji Nishi / Aso-ku Ozenji Higashi / Aso-ku Okaue / Aso-ku Katahiru / Aso-ku Kanemoto / Aso-ku Kamiaso / Aso-ku Kuriki / Aso-ku Kurikidai / Aso-ku Kurihira / Aso-ku Kurokawa / Aso-ku Gorikida / Aso-ku Shimoaso / 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
Conclusion
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 renovation company strong in exterior renovations, and we carry out complete in-house construction from temporary scaffolding to roof work and exterior wall painting.
We are confident that our “cost, quality, and efficiency” 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 match 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 the roof overlay method, so please take a look if you are interested!
We look forward to your inquiries. Thank you very much.
Helpful information about exterior renovations can be found here!
・Asao-ku, Kawasaki City | Roof Cover | We performed roof repairs with Super Galtect!
・Asao-ku, Kawasaki City | Roof Cover | We performed roof repairs with Super Galtect!
・Asao-ku, Kawasaki City | Roof Cover | We removed the skylight and repaired the roof with Ridgeway!
・A summary of popular colors for exterior wall painting! We will introduce recommended color combinations!
・Painting DIY Plan! A must-see for those who want to do roof and exterior wall painting by themselves! We will only set up the scaffolding!
・About the costs of roof cover | Kakeru Koumuten’s roof construction plan!
・About the costs of exterior wall painting | Kakeru Koumuten’s exterior wall painting plan!
・About the costs of leak repairs | Kakeru Koumuten’s leak repair plan!
・About the costs of ridge cap replacement and surface plaster | Kakeru Koumuten’s construction plan!
・Latest information | Subsidies and grants available for renovations, and reduction systems!
・What are the market prices for rain gutter repairs and cleaning? Tips on timing, fire insurance, and choosing contractors!
・Renovation Store in Kanagawa Prefecture, Yokohama | What is Roof Overlay (Roof Cover Method)?
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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!
