Construction example

[Nakano-ku, Tokyo]|We performed a roof overlay (cover method) using Super Galtect on the existing roof of Grishade Neo!

BEFORE

AFTER

Construction Data in Nakano, Tokyo

Construction Location
 Nakano, Tokyo
Construction Details
 Temporary scaffolding installation
 Roof overlay (cover method)
Existing Materials
 Roofing material: Slate Grishade Neo
New Materials Used
 Roofing material: Aijii Industry / Super Galtect
 Roofing sheet: Tajima Roofing / Tadi Self Cover
 Nail board: Galvalume steel plate
 Sealing material: Auto Chemical Industry / Auton Exceed
Price Range
 1,400,000 to 1,500,000 yen
Construction Period
 Approximately 6 days
Completion Month
 January 2026
Inquiry Details
We received an inquiry from a customer living in Nakano Ward saying, “A part of the roof is broken, and I would like to request a quote for roof work!”

Roof Overlay (Cover Method) Construction Steps

1. Existing Ridge and Snow Stops Demolition

We will dismantle unnecessary parts (ridge flashing and snow stops) for the overlay method!
The existing ridge base is made of cedar, which has a durability of about 10 to 15 years.

Once the durability period is exceeded, corrosion and discoloration can occur, leading to the detachment and scattering of the ridge flashing.

2. Roofing Sheet Installation (Waterproof Sheet) and Accessory Processing (Curved, Eaves, Valley, Ridge Base)

Next, we will install the roofing sheet (waterproof sheet) on the base. We used Tajima Roofing / Tadi Self Cover, which is a highly durable and waterproof roofing material.

Tadi Self Cover is the ideal roofing sheet for covering fragile slate materials, such as non-asbestos roofing materials. It serves as a secondary waterproofing layer, and as long as the roofing is solid, it generally does not leak!

We will securely attach this to prevent it from being blown away by the wind. Since there are various durability periods and characteristics for roofing sheets, it is important to choose a roofing sheet that matches the durability of the new roofing material and the roof slope!

Before installing the main roofing, we will process and install accessories such as eaves and curved sections. The accessories used are genuine accessories from Super Galtect, made of SGL copper plate!

3. Main Construction (Aijii Industry / Super Galtect)

 

After processing the accessories, we will install the Galtect main roofing up to the ridge. After processing the accessories, we will install the Galtect main roofing up to the ridge!
The main roofing material is secured with stainless steel renovation screws!

At the ridge, we will install the necessary ridge base to secure the ridge flashing. The nail boards we handle come in three types: cedar, resin, and galvalume steel plate, and this time we used galvalume steel plate.

Galvalume steel plate is expected to have three times the durability compared to cedar, and unlike resin or cedar, it does not crack, making it safe!

Our original integrated nail board made of galvalume steel plate is highly durable, has strong fixing power, and excellent wind resistance! Even if rainwater enters from the ridge, it has a mechanism to drain rainwater to the outside, providing high waterproofing performance!

4. Ridge Flashing Processing and Sealing at Various Locations

Next, we will process and install the ridge flashing. We will firmly apply sealing on the inside of the joints, and at the wall edges, we will process and install a component called rain stop flashing.

The screws used for fixing are rust-resistant stainless steel screws with washers!

Washer screws are less likely to come out compared to nails, securely fixing the ridge flashing to the nail board!

Although it is not visible after construction, by attaching a face plate to the inside of the ridge flashing, the waterproofing performance is enhanced! It firmly protects the ridge, which is a critical point of the roof.

5. Cleaning

We will clean up any debris that has fallen onto the balcony and other areas. We will thoroughly clean up nails and metal scraps that could cause injuries. Additionally, we will wipe and clean any footprints left on the roof.

About the Roofing Material

The roofing material used is Aijii Industry’s Super Galtect. Super Galtect comes with a 15-year coating warranty and a 25-year hole warranty, and we also provide a 10-year construction warranty!

Made of SGL steel plate, it is rust-resistant. The insulation material is tightly adhered from end to end of the roofing material, creating a metal plate that integrates the steel plate and insulation material.

When installed, insulation material is also applied 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, making it a good earthquake measure. It excels in finish, durability, insulation, soundproofing, and wind resistance, and Super Galtect from Aijii Industry is the most frequently used in our construction achievements and is highly regarded!

Colors

■ Shade Black
Shade Black
■ Shade Brown
Shade Brown
■ Shade Blue
Shade Blue
■ Shade Moss Green
Shade Moss Green
■ Shade Charcoal
Shade Charcoal

New Color Shade Wine Red

You can choose from the above 6 colors!

This time, we performed the overlay work in Shade Charcoal, and it turned out very well! The customer was very satisfied, and I was also very happy. Thank you!

Please check out other roofing overlay construction achievements here!

Roofing Material


Aijii Industry / Super Galtect

Roofing Material Color


Shade Charcoal

Shade Charcoal

Leave Your Roofing Work in Nakano, Tokyo to Kakeru Koumuten!

We have many construction achievements in Nakano, Tokyo. We are happy to assist with roof overlay work, roof replacement work, and partial roof repairs such as leak repairs.

“I just want to know the estimate for roof renovation,” “I want to know about roofing materials,” if you have any concerns or questions, please feel free to contact us!

Exterior Renovation Service Areas

Kakeru Koumuten accepts requests throughout Kanagawa Prefecture and all of Tokyo.

List of Areas in Nakano, Tokyo

Nakano, Tokyo Arai / Nakano, Tokyo Ekoda / Nakano, Tokyo Ebara-cho / Nakano, Tokyo Kamisaginomiya / Nakano, Tokyo Kamitakada / Nakano, Tokyo Saginomiya / Nakano, Tokyo Shirasagi / Nakano, Tokyo Chuo / Nakano, Tokyo Nakano / Nakano, Tokyo Numabukuro / Nakano, Tokyo Nogata / Nakano, Tokyo Higashi-Nakano / Nakano, Tokyo Honcho / Nakano, Tokyo Matsugaoka / Nakano, Tokyo Maruyama / Nakano, Tokyo Minamidai / Nakano, Tokyo Yamato-cho / Nakano, Tokyo Yayoi-cho / Nakano, Tokyo Wakamiya

Long-Term Reliability

All roofing materials we use are reliable products that offer long-term warranties. For example, the Super Galtect used this time comes with a 15-year coating warranty and a 25-year hole warranty. We also provide a 10-year construction warranty! This means you can use it with peace of mind for a long time after a single renovation.

While Super Galtect is an excellent roofing material in terms of durability, we also have roofing materials with even higher durability and better insulation properties available.

Summary

This concludes the construction achievements of the roof overlay method in Nakano, Tokyo.

Roof renovations vary depending on the existing condition and roofing materials, so it is essential to confirm that the proposed roofing materials align with what the customer is looking for.

At Kakeru Koumuten,estimates and inspections are, of course, free.
If you have any concerns regarding exterior renovations such as roofs, rain gutters, walls, or exteriors, please feel free to consult with us!

From temporary scaffolding work to roofing and exterior painting, we handle everything in-house! We are confident that in terms of cost, quality, and organization, we will not be outdone by other companies!

We are confident in our construction content and costs, so we welcome competitive estimates as well!
Our construction warranty and aftercare are comprehensive, and we receive high praise for our appropriate proposals that match the cost performance and the customer’s future life plans.

We are committed to ensuring that all our customers feel “I’m glad I chose Kakeru Koumuten!” by taking every request seriously.

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

◎We also welcome consultations via LINE!

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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!