Construction example

[Setagaya-ku, Tokyo]|Roof Overlay Using Super Galtect on a 30-Year-Old Detached House with Slate Roof!

BEFORE

AFTER

¥ Aoba-ku, Yokohama | Construction Data

Construction Location
 Setagaya-ku, Tokyo
Construction Details
 Temporary Scaffolding Installation
 Roof Overlay (Cover Method)
New Materials Used
◯ Roof Overlay (Cover Method)  
 Roof Material: Aijii Industry / Super Galtect (Color: Shade Charcoal)
 Roofing: Tajima Roofing / New Liner Roofing
 Purlin: Galvalume Steel
 Sealing Material: Auton Exceed
Price Range
 600,000 – 700,000 yen
Construction Period
 Approximately 6 days
Completion Month
 November 2025

Roof Overlay Construction Procedure

1. Demolition of Existing Ridge and Snow Guards

First, we will dismantle unnecessary parts (ridge flashing) for the overlay method!

The durability of wooden purlins is approximately 10 to 15 years. Once the durability period is exceeded, corrosion and discoloration occur, which can lead to the detachment and scattering of the ridge flashing.

2. Installation of Roofing (Waterproof Sheet) andAccessory Processing (Eaves, Gable, Valley)

Next, we will apply the waterproof sheet! The roofing used is Tajima Roofing / New Liner Roofing, which is highly durable and waterproof!

New Liner Roofing is the ideal roofing sheet for overlay methods on weak slate materials such as non-asbestos roofing. With the role of secondary waterproofing, if the roofing is properly installed, it generally does not leak. We will ensure it is firmly applied so it does not get 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 period of the new roof and the roof slope!

Before the main roofing construction, we will process and install accessories such as eaves, gables, and valleys. The accessories used are the genuine accessories of Galtect, made from SGL steel plate!

The metal at the ridge is our original integrated waste board type ridge base. It has a durability of approximately 30 years and is a highly wind-resistant ridge base.

3.Main Construction (Aiji Industrial / Super Galtect)

After processing the

accessories, we will install the Galtect main body up to the ridge! The fasteners used for the Galtect main body are genuine stainless steel renovation screws from Aiji Industrial!

Once we have installed the Galtect up to the ridge, we will set up the necessary materials to secure the ridge cap, known as the “kanban.” We offer three types of kanban: cedar, resin, and Galvalume steel, and this time we used the Galvalume steel!

The Galvalume steel is expected to have three times the durability compared to cedar! Unlike resin or cedar, it won’t crack, so you can rest assured!

Our original integrated waste board made of Galvalume steel for the ridge base is highly durable, offers strong fastening power, and has excellent wind resistance!

Even if rainwater enters from the ridge, it has a mechanism to discharge rainwater to the outside, providing high waterproof performance!

It is perfect for the ridge base of Super Galtect!

4. Ridge Cap Processing and Sealing at Various Locations

We will process and install the ridge cap

. To enhance waterproofing, we will install a face plate on the inside of the ridge! We will firmly apply sealing on the inside of the joints.

We will use rust-resistant stainless steel screws with waterproof washers for fastening!

Screws with washers are less likely to come loose compared to nails,
and securely fasten the ridge cap to the kanban!

 

Although it’s not visible after construction,
installing a face plate on the inside of the ridge cap
enhances waterproofing!
It firmly protects the ridge, which is a critical part of the roof.

5. Cleaning

After the

roofing work, we will clean up any debris that has fallen onto the balcony or rain gutters. We thoroughly remove nails and metal scraps to prevent injuries.

We will also wipe away any footprints left on the roof to ensure it looks clean.

About Roofing Materials

The roofing material used is Ai-Gi Kogyo / Super Galtect. Super Galtect comes with a 15-year coating warranty and a 25-year hole warranty from the manufacturer, along with a 10-year construction warranty from our company! Additionally, it is made of SGL steel, which is resistant to rust.

The insulation material is tightly applied from edge to edge of the roofing material, creating a metal panel that integrates steel and insulation. During installation, insulation is applied even to the areas where the roofing materials overlap, and the surface is coated with a highly heat-reflective paint, making it possible to stay cool in summer and warm in winter.

Moreover, it also has soundproofing properties, reducing the sound of rain. Being lighter than other roofing materials, it minimizes the sway during earthquakes, providing earthquake resistance.

It excels in finish, durability, insulation, soundproofing, and wind resistance, and our company’s construction achievements show that Ai-Gi Kogyo’s Super Galtect is the most frequently used, gaining significant attention!

Color

■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 these 6 colors!
This time, we completed the overlay work with Shade Charcoal, and it turned out very 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!

Roof Material

Aiji Giken / Super Galtect

Manufacturer Warranty Coating 15 years, Rust 20 years, Puncture 25 years
Expected Durability About 35 to 40 years
Color Used This Time


Shade Charcoal

Shade Charcoal

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

Our company is based in Yokohama and has extensive experience in roof renovations in Setagaya, Tokyo.

We are happy to assist with partial roof repairs, including roof overlay work, roof replacement, and leak repairs!

If you have any questions or concerns, such as “I just want to know the estimate for a 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 Kanagawa Prefecture, we have handled many roof overlays in Setagaya and have a deep understanding of the needs of local customers. Whether you want a long-lasting renovation in one go, aim to keep costs down, or want to improve insulation because your indoors are hot, we will propose the best solutions for your specific requests.

List of Areas in Setagaya, Tokyo

Akaidate, Setagaya-ku, Tokyo / Ikejiri, Setagaya-ku, Tokyo / Unanene, Setagaya-ku, Tokyo / Umegaoka, Setagaya-ku, Tokyo / Okura, Setagaya-ku, Tokyo / Ohara, Setagaya-ku, Tokyo / Okamoto, Setagaya-ku, Tokyo / Okusawa, Setagaya-ku, Tokyo / Oyamadai, Setagaya-ku, Tokyo / Kasuya, Setagaya-ku, Tokyo / Kamata, Setagaya-ku, Tokyo / Kamima, Setagaya-ku, Tokyo / Kamikitazawa, Setagaya-ku, Tokyo / Kamoshita, Setagaya-ku, Tokyo / Kameido, Setagaya-ku, Tokyo / Kitakurayama, Setagaya-ku, Tokyo / Kitazawa, Setagaya-ku, Tokyo / Kitami, Setagaya-ku, Tokyo / Kinuta, Setagaya-ku, Tokyo / Kinuta Park, Setagaya-ku, Tokyo / Kyuta, Setagaya-ku, Tokyo / Kyodo, Setagaya-ku, Tokyo / Gotokuji, Setagaya-ku, Tokyo / Komazawa, Setagaya-ku, Tokyo / Komazawa Park, Setagaya-ku, Tokyo / Sakura, Setagaya-ku, Tokyo / Sakuraoka, Setagaya-ku, Tokyo / Sakurashinmachi, Setagaya-ku, Tokyo / Sakurajōsui, Setagaya-ku, Tokyo / Sangenjaya, Setagaya-ku, Tokyo / Shimoma, Setagaya-ku, Tokyo / Shinmachi, Setagaya-ku, Tokyo / Seijo, Setagaya-ku, Tokyo / Seta, Setagaya-ku, Tokyo / Setagaya, Setagaya-ku, Tokyo / Soshigaya, Setagaya-ku, Tokyo / Taishido, Setagaya-ku, Tokyo / Daisawa, Setagaya-ku, Tokyo / Daita, Setagaya-ku, Tokyo / Tamagawa, Setagaya-ku, Tokyo / Tamagawadai, Setagaya-ku, Tokyo / Tamagawadenenchōfu, Setagaya-ku, Tokyo / Tamazutsumi, Setagaya-ku, Tokyo / Chitosedai, Setagaya-ku, Tokyo / Tsurumaki, Setagaya-ku, Tokyo / Todoroki, Setagaya-ku, Tokyo / Nakacho, Setagaya-ku, Tokyo / Noge, Setagaya-ku, Tokyo / Nozawa, Setagaya-ku, Tokyo / Hachiman-yama, Setagaya-ku, Tokyo / Hanegi, Setagaya-ku, Tokyo / Higashitamagawa, Setagaya-ku, Tokyo / Fukazawa, Setagaya-ku, Tokyo / Funabashi, Setagaya-ku, Tokyo / Matsubara, Setagaya-ku, Tokyo / Mishuku, Setagaya-ku, Tokyo / Minami-Kurayama, Setagaya-ku, Tokyo / Miyasaka, Setagaya-ku, Tokyo / Yoga, Setagaya-ku, Tokyo / Wakabayashi, Setagaya-ku, Tokyo

Long-Term Reliability

All roofing materials we use come with reliable long-term warranties. For example, the Super Galtect we used this time has a 15-year paint warranty and a 25-year hole warranty from the manufacturer. 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.

Super 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, so please feel free to consult with us.

Summary

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 has become a strong remodeling company specializing in exterior renovations, performing everything from temporary scaffolding work to roofing and exterior painting completely in-house. We are confident that our cost, quality, and efficiency in exterior renovation work are unmatched compared to other companies!

We are confident in our exterior renovations, so we welcome competitive estimates! Our construction warranties and aftercare services are comprehensive, 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 roofing costs and pricing plans for the roof overlay (cover 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◎

We are also updating our Instagram regularly◎
Please follow us◎

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!