Hello!
We are Kakeru Koumuten Co., Ltd., a roofing, exterior painting, and exterior renovation specialist located in Aoba-ku, Yokohama, Kanagawa Prefecture!
This is a case study of an exterior renovation in Aoba-ku, Yokohama.
There are several types of exterior renovations, but this project involves a roof overlay using Super Galtect!
We implemented measures against leaks through the roofing work!
Thanks to fire insurance, we were able to significantly reduce the customer’s burden.
At the I residence, we were also entrusted with the removal of the solar water heater!
We have also uploaded photos of the solar water heater removal, so please take a look if you’re interested!
Roof Overlay Construction Procedure
1. Demolition of the existing roof ridge
2. Installation of roofing (waterproof sheet)
3. Fabrication of accessories (decorative elements and eaves)
4. Main construction
5. Installation of ridge cap and wall rain guard

What is the Roof Overlay Method?
The roof overlay method involves leaving the current roof almost intact 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, it is also referred to as “overlaying.”
Advantages of the Overlay Method
By placing a “new roof” 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 advantages.
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 refer to the Ministry of Health, Labour and Welfare’s website).
Some building materials used in constructions completed before 2004 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?” 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, the construction can be completed in a shorter period than painting or a complete 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, you may experience inconveniences such as difficulty entering and exiting or being unable to open windows. Being able to return to your normal life in a short period is a significant advantage.
Our company specializes in roofing work, but the roof overlay method is the most frequently performed service we offer. We are very grateful that we have been continuously engaged in roof overlay projects without interruption.
About Roofing Materials
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.
We also provide a 10-year construction warranty!
It is made of SGL steel plate, which is resistant to rust.
Insulation material is densely 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.
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, providing earthquake resistance.
It excels in finish, durability, insulation, soundproofing, and wind resistance, and the Super Galtect from Aijii Industrial is the most frequently used material in our construction achievements and is receiving considerable attention!
Color
■Shade Black

■Shade Brown

■Shade Blue

■Shade Moss Green

■Shade Charcoal

■New Color Shade Wine Red

You can choose from these 6 colors!
This time, the cover work with Shade Blue 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 results from here!
Leave your roof renovation in Midori-ku, Yokohama to Kakeru Koumuten!
Our company has a wealth of experience in roof renovations in Midori-ku.
We are happy to assist with everything from roof overlay projects, roof replacements, to partial roof repairs such as leak fixes.
If you have any questions or concerns like “I just want to know the estimate for 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 Midori-ku and have a deep understanding of the needs of 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 to specific requests like these.
Long-Term Reliability
All roofing materials we use come from reliable manufacturers that offer long-term warranties. For example, the Super Galtect we used this time comes with a 15-year coating warranty and a 25-year hole warranty. We also provide a 10-year construction warranty, so you can use it with peace of mind for a long time after just one renovation.
Galtect is a lightweight roofing material that excels in durability and cost performance, but we also offer roofing materials with even higher durability and better insulation properties.
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 everything from temporary scaffolding work to roofing and exterior painting completely in-house.
We are confident that in terms of “cost, quality, and efficiency”, we do not fall behind compared to other companies!
We are confident in our exterior renovations, so we welcome competitive estimates!
We also offer robust construction warranties 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 methods, 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!
・Aoba-ku, Yokohama | Roof Overlay (Cover Method) | We performed the cover method with Super Galtect!
・Aoba-ku, Yokohama | We performed the roof overlay (cover method) before installing solar panels!
・Aoba-ku, Yokohama | Roof Replacement | We performed roofing work/roof reform with Hiranbee!
・Aoba-ku, Yokohama | Roof Overlay (Cover Method) | We performed panel removal and roofing work!
・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!
・What is the cost range for roof reform? Types of construction and how to choose a contractor, etc.
・We will introduce construction methods according to the type of roof construction and the degradation situation!
・Latest! About subsidies and reduction systems available for renovations!
・What are the market prices for rain gutter repair and cleaning? Tips on timing, fire insurance, and choosing a contractor!!
・Renovation store in Yokohama, Kanagawa Prefecture | 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!


