Tokyo | Hachioji City | Request from Company K: We performed roof renovation and leak prevention!

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 K in Hachioji City, Tokyo.
There are several types of exterior renovations, and this project involves a roof overlay (cover method)!
We implemented measures against leaks due to the roofing work!

On this page, we will explain the actual achievements of Kakeru Koumuten!

Thank you very much for choosing Kakeru Koumuten Co., Ltd. from among many contractors.

Roof Replacement Construction Procedure

1. High-Pressure Cleaning

2. Dismantling Existing Roof Ridge Flashing

We will dismantle the existing roofing materials (ridge metal, snow guards) that are unnecessary for the

roof overlay method! The existing wooden purlins in the photo are made of wood. The lifespan of wooden purlins is about 10 to 15 years. Exceeding the lifespan can lead to corrosion and discoloration, resulting in the ridge metal coming loose or being blown away.

3. Roofing Installation (Waterproof Sheet)

The roofing used is Nisshin Kogyo/Kappa 23!
It is made of modified asphalt roofing, which is said to have double the lifespan of regular asphalt roofing.
As a primary waterproofing measure, if the roofing is properly installed, there will be no leaks!
We will ensure it is securely attached to prevent it from blowing away.[/chat]

4. Component Processing (Kera, Karakusa, Valley)

Before the main roofing work, we will process and install components such as kera and karakusa metal!
The components used are made of galvalume steel. [/chat]

5. Main Construction (Inagaki Shouji/Hiranbi)

After processing the

6. Processing of Ridge Metal and Sealing at Various Locations

Next, we will process and install the ridge metal. We will thoroughly apply sealing on the inside of the joints. At the wall edges, we will process and install a component called “ameosae bankin” (rain guard metal).
We use stainless steel nails and screws that are resistant to rust![/chat]

7. Cleaning

About the Roofing Material

The roofing material used is Hiranbi 220 from Inagaki Shouji.
Hiranbi 220 comes with a manufacturer warranty of 15 years for the coating and 25 years for perforation.
For re-roofing and overlaying, we also provide a 10-year construction warranty!
If there are any leaks within 10 years, we will make repairs free of charge.
It is made of Galvalume steel, which is also resistant to rust.
The shaped panels have been treated with “ayame-ori” and “sazanami” processing to prevent distortion and enhance strength, as well as improve rain drainage and aesthetic effects.

Additionally, it excels in finish, durability, sound insulation, and wind resistance. Its lightweight nature compared to other roofing materials reduces the sway during earthquakes, making it a good earthquake countermeasure.
In the roof overlay (cover method) work that was carried out this time, the roof becomes double-layered, which will increase the weight. However, Hiranbi is a lightweight roofing material, making it suitable for roof overlay (cover method) work.

Color

Extreme – MAX Type
■ Gray Silver

■ Silver Black

■ Sepia

■ Moss Green

■ Bamboo Green

■ Midnight Blue

■ Jet Black

■ Dark Brown

■ Bright Red

General Type
■ Steel Black

■Marron Brown

■J Silver

You can choose from these options!

This time, the cover work with Silver Black turned out exceptionally well!
Thank you for your request!!

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 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 “overlapping roofing.”

Advantages 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, leading to various advantages.

The only part that requires demolition and waste disposal is the ridge cap, so compared to complete roof replacement, the cost is lower.
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’s website).
Building materials used in structures constructed before 2004 may contain asbestos. Asbestos-containing materials are difficult to demolish due to their high environmental impact, and the costs for demolition and waste disposal are also high. The 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, we can complete the work in a shorter timeframe than painting or re-roofing. A shorter construction period means lower labor costs, which in turn makes the expenses more affordable.
This also reduces the psychological anxiety of having to live in an environment that is different from usual.
If scaffolding is set up, there may be inconveniences such as difficulty in entering and exiting or opening windows. Being able to return to normal life in a short period is certainly a significant advantage.

Our company specializes in roofing work, and the roof overlay (cover method) is the most frequently performed type of work we undertake. We are very grateful that we have been continuously engaged in roof overlay (cover method) projects without interruption.

Roof Material	Inagaki Shoji / Hiranbee 220
Manufacturer Warranty	Coating 15 years; Puncture 25 years
Expected Durability	About 35 years
Color Used This Time	Silver Black

Leave your roof renovation in Tokyo to Kakeru Koumuten Co., Ltd.!

Our company is based in Aoba-ku, Yokohama, but we also have a wealth of experience in roof renovations in Hachioji, Tokyo.
We are happy to assist with partial roof repairs, including roof overlay work, roof replacement, and leak repairs.
“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 exteriors, please consult Kakeru Koumuten Co., Ltd. in Aoba-ku, Yokohama!

Kakeru Koumuten is a remodeling 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 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 offer comprehensive construction guarantees and aftercare maintenance, and we have received positive feedback for our 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’re interested!

We look forward to your inquiries. Thank you very much.

Helpful information about exterior renovations can be found here!

LINE consultations are also very welcome◎

For roofing, guttering, and exterior work and repairs in Kanagawa, contact Kakerukoumuten Co., Ltd..

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!