BEFORE

AFTER

Yamato City, Kanagawa Prefecture | Construction Data

Construction Location
 Yamato City, Kanagawa Prefecture
Construction details
 Temporary Scaffolding Installation
 Roof overlay installation
New Materials Used
 ◯ Roof Overlay Installation  
  Roof Material: Aijii Industry / Super Galtect (Color: Shade Brown)
  Roofing: Tajima Roofing / Tadi Self Cover
  Purlin: Galvalume Steel
 ◯ Roof Adhesive Overlay Installation (Solar Panel Installation Area)
  Roof Material: Keimyuu / Recolonies (Color: Brown)
Price Range
 850,000–950,000 yen
Construction Period
 Approximately 5 days
Completion month
 2025-06

Roof Overlay Construction Procedure

1. Demolition of Existing Ridge

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

The lifespan of wooden purlins is about 10 to 15 years. Once this lifespan is exceeded, corrosion and discoloration occur, leading to the detachment and scattering of the ridge flashing.

2. Laying Roofing (Waterproof Sheet)

Next, we will lay the waterproof sheet! The roofing used is 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 slates such as non-asbestos roofing materials. As a secondary waterproofing measure, if the roofing is properly installed, it generally does not leak. We will ensure it is securely attached to prevent it from being blown away by the wind.

Since there are various lifespans and characteristics of roofing sheets, it is important to choose roofing sheets that match the lifespan of the new roof and the roof slope!

3. Fabrication of Accessories (Curlicue & Eaves)

Before the main roof construction, we will fabricate and install accessories such as curlicues and eaves. The accessories used are genuine accessories from Galtect, made of SGL steel plate!

The ridge metal is our original integrated waste board type ridge substrate. Durability of approximately 30 years is expected, making it a highly wind-resistant ridge substrate.

4.Main Construction (Aijii Industry / 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 Aijii Industry!

Once the installation reaches the ridge, we will set up the necessary materials to fix the ridge metal called a “kanban.” We offer three types of kanban: cedar, resin, and galvalume steel, and this time we used galvalume steel!

Galvalume steel can be expected to have three times the durability of cedar! Unlike resin or cedar, it does not crack, providing peace of mind!

Our original integrated waste board type galvalume steel ridge substrate is highly durable, has strong fixing power, and excellent wind resistance!

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

It is ideal for the Super Galtect ridge substrate!

5. Ridge Metal Processing and Sealing at Various Locations

We will process and install the ridge metal. 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.

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

Screws with packing are less likely to come loose compared to nails,
firmly securing the ridge metal to the kanban!

 

Although it is not visible after construction,
by installing a face plate inside the ridge cap,
the waterproofing is enhanced!
We will firmly protect the ridge, which is a critical part of the roof.

6. Roof Adhesive Cover Construction (Only for Solar Panel Installation Area)

In this customer’s home, solar panels were installed, so we fixed Keimyu / Recolonies with Metal Keeper only on the solar installation area.

Recolonies are installed by adhering to the existing roofing material. The surface coating has a durability of about 10 to 15 years, is resistant to rain and wind, and provides a sharp finish unique to metal. Additionally, it is characterized by lower costs compared to overlaying or replacing the roof.

7. Cleaning

After the roof construction, we will clean up any debris that has fallen onto the balcony or rain gutters. We will thoroughly remove nails and metal scraps, as they can lead to injuries.

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

About Roofing Materials

The roofing material used is Ai-Gi Kogyo / Super Galtect. Super Galtect comes with a 15-year paint 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 sheet 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 a highly heat-resistant paint, allowing for a cool summer and a warm winter.

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

It excels in finish, durability, insulation, soundproofing, and wind resistance, and Super Galtect from Ai-Gi Kogyo is the most frequently used in our construction achievements and is 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 Brown, and it turned out very well!
The customer was extremely satisfied, and I was very happy too!
Thank you very much!

Please check out other roofing work results from here!

For roofing work in Yamato City, Kanagawa Prefecture, trust Kakeru Koumuten!

In addition to our base in Yokohama, we also have a location in Machida, Tokyo, and we have numerous achievements in roof renovations in nearby Yamato City, Kanagawa Prefecture.

We are happy to assist with everything from roof overlay work, roof replacement, to partial roof repairs such as leak repairs!

“I want it to last a long time with one renovation” “I want to keep costs down as much as possible” “I want to improve insulation because the indoors are hot” “Just a temporary fix for the water leak for now”, we will propose the best plan tailored to your specific requests!

Yamato City Area List

Kamikusayanagi, Yamato City / Kamikwada, Yamato City / Sakuramori, Yamato City / Shibuya, Yamato City / Shimokusayanagi, Yamato City / Shimotsuruma, Yamato City / Shimowada, Yamato City / Kusayanagi, Yamato City / Daikan, Yamato City / Chuo, Yamato City / Chuo Rinkan, Yamato City / Chuo Rinkan Nishi, Yamato City / Tsukiminoko, Yamato City / Tsuruma, Yamato City / Nishitsuruma, Yamato City / Fukami, Yamato City / Fukami Dai, Yamato City / Fukami Higashi, Yamato City / Fukami Nishi, Yamato City / Fukuda, Yamato City / Minami Rinkan, Yamato City / Yanagihashi, Yamato City / Yamato Higashi, Yamato City / Yamato Minami, Yamato City / Rinkan, Yamato City

Long-term Reliability

All roofing materials we use come with reliable products that offer long-term warranties!

For example, the Super Galtect we used this time comes with 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 one renovation.

Super Galtect is a lightweight roofing material that excels in durability and cost performance, but we also handle roofing materials with even higher durability and better insulation, so please feel free to consult us!

Summary

Estimates and inspections are, of course, free! If you have any concerns about roofs, rain gutters, exterior walls, or exteriors, please consult Kakeru Koumuten Co., Ltd. in Kanagawa Prefecture!

Kakeru Koumuten is a company strong in exterior renovations. From temporary scaffolding work to roofing and exterior painting work we handle everything in-house! We are confident that in terms of “cost, quality, and efficiency”, we will not be outdone by other companies!

We are confident in our exterior renovations, so we welcome competitive estimates! Our construction warranties and aftercare maintenance are robust, 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 look forward to your inquiries. Thank you very much.

Helpful information about exterior renovations can be found here!

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For roof, gutter and exterior construction and repairs in Kanagawa,
contact Kakeru Koumuten Co., Ltd.

Kakeru Koumuten is a young company whose team is, on average, in their late twenties, but our skills are second to none.

Our greatest strength is that we handle scaffolding, roofing and painting entirely in-house. In an industry where these tasks are usually divided among contractors, our complete service simplifies project management and helps keep costs down. Above all, if a problem arises, we respond promptly.

We proudly describe ourselves as the youngest and most helpful renovation company in Kanagawa!