Hello!
I am Yamanaka from Kakeru Koumuten Co., Ltd., a specialist in exterior renovations located in Aoba-ku, Yokohama, Kanagawa Prefecture!
This is a case study of a roof overlay (cover method) construction at Mr. M’s residence in Kohoku-ku, Yokohama.
Thank you very much for choosing Kakeru Koumuten Co., Ltd. for your project.
This roof overlay construction utilizes fire insurance in Kohoku-ku, Yokohama.
Thanks to the fire insurance, we were able to significantly reduce the customer’s burden.
Kakeru Koumuten has extensive knowledge and experience necessary for fire insurance claims.
Please rest assured that we will provide full support for any questions you may have!
We have received great feedback from apartment owners as well.
Roof Overlay Construction Photos at Mr. M’s Residence in Kohoku-ku
1. Demolition of existing roof ridge

2. Laying roofing (waterproof sheet)

3. Fabrication of components (decorative patterns, eaves, valleys)
4. Main construction

5. Ridge Cap Processing

About the Roofing Material Used
The roofing material used is the Super Galtect from Aijii Industrial.
The 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!
Additionally, it is made of SGL steel, which is resistant to rust.
Insulation material is tightly applied from edge to edge of the roofing material, creating a metal sheet that integrates the steel plate 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.
Moreover, it has soundproofing properties, which reduce the sound of rain.
Being lighter than other roofing materials, it also minimizes the sway during earthquakes, providing earthquake resistance.
It excels in finish, durability, insulation, soundproofing, and wind resistance, and the Super Galtect from Aijii Industrial is the most commonly used in our construction achievements, gaining significant attention!
Color
■Shade Black

■Shade Brown

■Shade Blue

■Shade Moss Green

■Shade Charcoal

You can choose from these 5 colors!
This time, the cover work with Shade Black turned out very well!
The customer was extremely satisfied, and I was very happy too!
Thank you very much!
Please check out other roofing work examples from here!
What is the Roof Overlay (Cover Method)?
The roof overlay method involves leaving the current roof almost as it is and placing a new roof on top of it, effectively covering 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 another, it is also referred to as “overlapping roofing.”
Benefits of the Overlay Method
Since a “new roof” is placed over the “current roof,” demolition work is almost unnecessary, meaning that very little waste is generated.
This is the biggest feature and leads to various benefits.
The only part that requires dismantling and waste disposal is the ridge cap, so compared to a complete roof replacement, the cost is lower.
In 2004, regulations regarding the concentration of asbestos in raw materials were changed (for details, please see the Ministry of Health, Labour and Welfare website below).
Building materials used in structures constructed before 2004 may contain asbestos. Asbestos-containing materials are difficult to dismantle due to their high environmental impact, resulting in high costs for both dismantling and waste disposal. The roof overlay method, which generates almost no waste, is ideal for such roofs.
Some may wonder, “Is it safe to live in a building that uses asbestos-containing materials?” 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 consult us.
Additionally, the construction can be completed in a shorter period than painting or a full roof replacement. A shorter construction period means lower labor costs, which in turn makes the cost lower.
This also reduces the psychological anxiety of having to live in an unusual environment.
When scaffolding is set up, there may be inconveniences such as difficulty entering and exiting or opening windows. Being able to return to normal life in a short period is a significant advantage.
Our company specializes in roofing work, but roof overlay method construction is the most frequently performed work we do. We are very grateful that we have been continuously engaged in roof overlay method construction without interruption.
| Roof Material |
Aijigyo Co., Ltd. / Super Galtect
|
|---|---|
| Manufacturer Warranty | Coating 15 years, Red rust 20 years, Puncture 25 years |
| Expected Durability | Approximately 40 years |
| Color Used This Time |
Shade Black
|
Trust Kakeru Koumuten for Roof Renovations in Kohoku-ku, Yokohama!
Our company has extensive experience in roof renovations in Kohoku-ku.
We are happy to assist with partial roof repairs, including roof overlay work, roof replacement, and leak repairs.
If you have any questions or concerns, such as “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 an exterior renovation company based in Aoba-ku, Yokohama, we have handled many roof renovations in nearby Kohoku-ku and have a deep understanding of the needs of local customers. Whether you want to “make it last with one renovation,” “keep costs down,” or “improve insulation because the indoors are hot,” we provide optimal solutions for your specific requests.
Conclusion
Estimates and inspections are, of course, free! If you have any issues with 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 roofing and exterior painting.
We are confident that our “cost, quality, and efficiency” in exterior renovation work are unmatched compared to other companies!
We are confident in our exterior renovations, so we welcome competitive estimates!
We offer comprehensive construction guarantees and aftercare, and we have received positive feedback for our 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 the roof overlay method, so please take a look if you’re interested!
We look forward to your inquiries. Thank you very much.
Helpful information about exterior renovations can be found here!
・Kohoku-ku, Yokohama | Roofing | We performed roof replacement work and cap metal replacement work!
・Aoba-ku, Yokohama | Roofing | We performed roof replacement using Super Galtect!
・Kohoku-ku, Yokohama | Roof Overlay (Cover Method) | We performed the cover method 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 scaffolding!
・What is the cost range for roof remodeling? Types of work and how to choose a contractor, etc.
・Latest | Grants and subsidies available for remodeling, and reduction systems!
・How much does it cost for roofing work? We will introduce the cost range!
・What is the cost range for rain gutter repair and cleaning? Tips on timing and choosing a contractor for fire insurance too!
・Renovation Store in Kanagawa Prefecture, Yokohama | What is Roof Overlay (Roof Cover Method)?
LINEConsultations via LINE 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!


