A Residence in Aoba-ku, Yokohama: Roof Overlay Work (Super Galtect)
Thank you very much for choosing Kakeru Koumuten Co., Ltd. for your project.
This is a roof overlay project utilizing fire insurance in Aoba-ku, Yokohama.
Thanks to the fire insurance, we were able to significantly reduce the customer’s burden.
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 in Aoba-ku, Yokohama.
There are several types of exterior renovations, and this project involves a roof overlay using Super Galtect!
We implemented measures against leaks through the roofing work!
目次
Roof Overlay Work Procedure
1. Demolition of existing roof ridge
2. Installation of roofing (waterproof sheet)
3. Fabrication of accessories (decorative eaves and verge)
4. Main construction work
5. Fabrication of ridge flashing and rain diverter

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.
As the name suggests, it is a method of covering a roof with another roof. Therefore, the roof becomes double-layered. It is also referred to as “overlaying” because the roof is laid over the existing one.
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 most significant feature, leading to various advantages.
The only part that requires dismantling and waste disposal is the ridge cap, so compared to a full roof replacement, the cost is lower.
In 2004, regulations regarding the concentration of asbestos in raw materials were changed (for more details, please visit the Ministry of Health, Labour and Welfare’s website).
Some building materials used in structures built 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 time frame compared to painting or full roof replacement. A shorter construction period means lower labor costs, which in turn makes the overall 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 type of work we undertake. 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!
Made from SGL steel plates, it 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 highly heat-reflective paint, allowing for a cool summer and a 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, contributing to 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 gaining significant 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, we completed the cover work with Shade Moss Green, and it turned out exceptionally well!
The customer was very satisfied, and I was also very happy!
Thank you very much!
Please check out our other roofing work achievements here!
For roof renovations in Asahi-ku, Yokohama, trust Kakeru Koumuten Co., Ltd.!
Our company is based in Yokohama, so we have a wealth of experience in roof renovations in Aoba-ku, Yokohama.
We are happy to assist with everything from roof overlay work, roof replacement, to partial roof repairs such as 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!
Kakeru Koumuten Co., Ltd. is a remodeling company strong in exterior renovations, and we carry out everything from temporary scaffolding work to roof work and exterior wall painting completely in-house.
Regarding exterior renovation work, we are confident that we do not fall short compared to other companies in terms of “cost, quality, and efficiency.”
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 our customers’ future life plans and cost performance!
We want you to think, “I’m glad I asked them!” Therefore, we take every request seriously.
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!
・Aoba-ku, Yokohama | We performed entrance front and eaves replacement work, along with a roof overlay (cover method) using Super Galtect!
・Aoba-ku, Yokohama | Roofing work | We conducted roof overlay (cover method) and joint sealing work!
・Aoba-ku, Yokohama | Roofing work | We carried out a roof overlay (cover method) using Super Galtect!
・DIY Painting Plan! A must-see for those who want to paint their roof and exterior walls themselves! We only set up scaffolding!
・What is the cost range for roof remodeling? Types of work and how to choose a contractor.
・Latest information on subsidies, grants, and reduction systems available for remodeling!
・How much does roof work cost? We introduce the cost range!
・What is the cost range for rain gutter repair and cleaning? Tips on timing, fire insurance, and choosing a contractor!
・Remodeling store in Yokohama, Kanagawa | 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!


