

Hello!
This is Yamanaka from 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 an exterior renovation project requested by Company S in Adachi-ku, Tokyo.
There are several types of exterior renovations, and this project involves a roof overlay (cover method) using Galtect!
We implemented measures against leaks through the roofing work!
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 Roof Overlay (Cover Method) Construction Procedure
- 1.1 1. Dismantling of Existing Roof Ridge Flashing
- 1.2 2. Roofing Installation (Waterproof Sheet)
- 1.3 3. Component Processing (Curlicue, Eaves, Valley)
- 1.4 4. Main Construction (Aijii Industry/Super Galttect)
- 1.5 5. Ridge Metal Work Processing & Sealing at Various Locations
- 1.6 6. Cleaning
- 1.7 About Roofing Materials
- 2 What is the Roof Overlay (Cover Method)?
- 3 For roof renovations in Tokyo, trust Kakeru Koumuten Co., Ltd.!
Roof Overlay (Cover Method) Construction Procedure
1. Dismantling of Existing Roof Ridge Flashing

We will dismantle the existing roofing materials (ridge cap, snow guards) that are unnecessary for the
2. Roofing Installation (Waterproof Sheet)

The roofing used is
It is made of modified asphalt roofing, which is said to have double the durability of regular asphalt roofing.
As a primary waterproofing measure, if the roofing is properly installed, there will be no leaks!
We will secure it firmly to prevent it from blowing away.
3. Component Processing (Curlicue, Eaves, Valley)


The components used are the genuine parts of Galttect, made from SGL copper plate!
4. Main Construction (Aijii Industry/Super Galttect)

Once the roofing is completed up to the ridge, we will install necessary materials called “nail boards” to secure the ridge metal work. There are types of nail boards made from cedar and resin, and this time we used resin purlins!
5. Ridge Metal Work Processing & Sealing at Various Locations


The nails and screws used for fastening are made of stainless steel, which is resistant to rust!
6. Cleaning


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.
Our company also provides a 10-year construction warranty!
Made of SGL steel plate, it is resistant to rust.
The insulation material is tightly applied from edge to edge of the roofing material, creating a metal plate that integrates the steel plate and insulation.
During installation, insulation is applied even to the parts where the roofing materials overlap, and the surface is coated with high heat-reflective paint, allowing for a cool summer and a warm winter.
Additionally, it has soundproofing properties, which reduce the sound of rain.
Being lighter than other roofing materials, it also minimizes the swaying during earthquakes, serving as an earthquake countermeasure.
It excels in finish, durability, insulation, soundproofing, and wind resistance, and the Super Galtect from Aijii Industrial is the most frequently used in our construction projects, 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 exceptionally well!
The customer was very satisfied, and I was also very happy!
Thank you very much!
Please check out other roofing work achievements 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.”
Advantages of the Overlay Method
Since a “new roof” is placed over the “current roof,” dismantling 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 demolition 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 more details, please visit 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 dismantle due to their high environmental impact, resulting in high costs for both demolition and waste disposal. The roof overlay method, which generates almost no waste, is ideal for such roofs.
Some of you may wonder, “Is it safe to live in a building that uses asbestos-containing materials?” but rest assured. As long as they are not destroyed or crushed, they 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 full roof replacement. A shorter construction period means lower labor costs, which in turn reduces the overall cost.
This also alleviates 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 opening 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 provide. We are very grateful that we have been continuously engaged in roof overlay projects without interruption.
| Roof Material |
Ai-G Co., Ltd. / Super Galtect
|
|---|---|
| Manufacturer Warranty | Coating 15 years, Red Rust 20 years, Perforation 25 years |
| Expected Durability | About 40 years |
| Color Used This Time |
Shade Black
|
For roof renovations in Tokyo, trust Kakeru Koumuten Co., Ltd.!
Our company has a wealth of experience in roof renovations in Tokyo.
We are happy to assist with everything from roof overlay work, roof replacement, roof repairs, to partial roof repairs such as leak fixes.
“I just want to know the estimate for roof renovation” or “I want to know about roofing materials”—if you have any questions or concerns, please feel free to contact us!
Summary
Estimates and inspections are, of course, free! If you have any issues with roofs, rain gutters, exterior walls, or exterior structures, 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 roof work and exterior wall painting completely in-house.
We are confident that our “cost, quality, and efficiency” in exterior renovation work will not be outdone by other companies!
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!
“I’m glad I asked them!”—we take every request seriously to ensure you feel this way.
We also have information on roof construction 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!
・Ota Ward, Tokyo | Exterior Painting | Eaves Replacement | Exterior Renovation Completed!
・Ota Ward, Tokyo | Roof Repair | Roof Overlay Using Ridgeway Completed!
・Machida City, Tokyo | Roof Repair | Roof Re-roofing Work Due to Water Leakage Completed!
・Machida City, Tokyo | Roof Repair | Roof Overlay Method Using Ridgeway Completed!
・DIY Painting Plan! Perfect for Those Who Want to Try DIY Roof and Exterior Wall Painting! We Only Set Up Scaffolding!
・About the Cost of Roof Overlay | Kakeru Koumuten’s Roof Construction Plan!
・About the Cost of Exterior Painting | Kakeru Koumuten’s Exterior Painting Plan!
・About the Cost of Water Leakage Repair | Kakeru Koumuten’s Water Leakage Repair Plan!
・Ridge Cap Replacement | Cost of Surface Plaster | Kakeru Koumuten’s Construction Plan!
・Latest Edition | Grants and Subsidies Available for Renovations, and Reduction Systems!
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・Renovation 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!



