Construction example

[Kanagawa Prefecture, Minamiashigara City] We performed a roof overlay (cover method) due to missing and cracked slate roofing on a detached house that is over 20 years old!

BEFORE

AFTER

Minamiashigara City, Kanagawa Prefecture | Construction Data

 約2週間 About 1 week Completion Month February 2025

Roof Overlay Construction Procedure

1. High-Pressure Washing

Before the roof overlay method, the existing roofing material had severe moss, so we washed the roof with high-pressure washing! If the moss is severe, it can hinder the adhesion of the roofing sheet, so we perform the cleaning. This time, we used bio-cleaning!

2. Dismantling Existing Ridge and Snow Stops

First, we will dismantle unnecessary parts (ridge flashing) for the overlay method! The durability of wooden purlins is about 10 to 15 years. If the durability period is exceeded, corrosion and discoloration occur, leading to the detachment and scattering of the ridge flashing.

3. Installing Roofing (Waterproof Sheet)

Next, we will apply the waterproof sheet! The roofing material used is Tajima Roofing / Tadi Self Cover, which is highly durable and waterproof!

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 will not leak. We will ensure it is firmly applied so that it does not get blown away by the wind.

Since there are various durability years and characteristics for roofing sheets, it is important to choose a roofing sheet that matches the durability years and roof slope of the new roof!

4.Accessory Processing (Karakusa, Keraba, Valley)

Before the main roofing work, we will process and install accessories such as keraba, karakusa, and valley. The accessories used are the genuine SGL steel plates from Galtect! The metal at the ridge is our original galvalume steel plate, which is an integrated base for the ridge board. It has a durability of about 30 years and provides high wind resistance for the ridge base.

5. Main Construction (Aijii Industry / Super Galtect)

After processing the accessories, we will install the Galtect main body up to the ridge! After processing the accessories, we will install the Galtect main body up to the ridge! The fasteners used for the Galtect main body are stainless steel renovation screws from Aijii Industry!

Once we have installed 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 galvalume steel! The 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 made of Galvalume steel for the ridge base is
highly durable, has strong fixation, and excellent wind resistance!
Even if rainwater seeps in from the ridge, it has a mechanism to discharge rainwater to the outside, providinghigh waterproof performance!
It is perfect for the Super Galtect ridge base!

6. 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 thoroughly apply sealing on the inside of the joints. We use stainless steel screws with waterproof packing that are resistant to rust for fixation!

Unlike nails, screws with packing are less likely to come loose and securely fix the ridge cap to the purlin!

 

Although it is 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 point of the roof.

7. Cleaning

After the roofing work is completed, 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 keep it 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 sheet that integrates the steel plate and insulation. When installed, insulation is applied even to the parts where the roofing materials overlap, and the surface is coated with a high heat-reflective paint, allowing for a cool summer and a warm winter.

Moreover, it has soundproofing properties, reducing the sound of rain. Being lighter than other roofing materials, it also minimizes the sway during earthquakes, providing 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 projects, 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 Moss Green, and it turned out very well!
The customer was extremely satisfied, and I was very happy too!
Thank you very much!

Roof Material

Aiji Gikou / Super Galtect

Manufacturer Warranty Coating 15 years, Red rust 20 years, Perforation 25 years
Expected Durability Approximately 35 to 40 years
Color Used This Time


Shade Moss Green

Shade Moss Green

 

Please check out other roofing project achievements here!

Leave Your Roofing Work in Minamiashigara City, Kanagawa Prefecture to Kakeru Koumuten!

Our company is based in Kanagawa Prefecture and has numerous achievements in roof renovations in Minamiashigara City, Kanagawa Prefecture.

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

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

Community-Focused Service

As an exterior renovation company in Kanagawa Prefecture, we have handled many roof renovations within the prefecture and deeply understand the needs of local customers. Whether you want to “make it last long with one renovation,” “keep costs down as much as possible,” or “increase insulation performance because the indoors are hot,” we will propose the best solutions for your specific requests.

Minamiashigara City List

Minamiashigara City, Amatsubo / Minamiashigara City, Iizawa / Minamiashigara City, Ikoma / Minamiashigara City, Iwahara / Minamiashigara City, Uchiyama / Minamiashigara City, Kano / Minamiashigara City, Karino / Minamiashigara City, Kitakubo / Minamiashigara City, Koichi / Minamiashigara City, Kousaiji / Minamiashigara City, Komagatashinjuku / Minamiashigara City, Sekimoto / Minamiashigara City, Chizushima / Minamiashigara City, Taiyomachi / Minamiashigara City, Takematsu / Minamiashigara City, Tsukahara / Minamiashigara City, Nakaduma / Minamiashigara City, Nodeta / Minamiashigara City, Numata / Minamiashigara City, Hirocho / Minamiashigara City, Fukuizen / Minamiashigara City, Madome / Minamiashigara City, Masushita / Minamiashigara City, Mitake / Minamiashigara City, Mukouda / Minamiashigara City, Yagurazawa / Minamiashigara City, Wada Kawahara

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 coating warranty and a 25-year hole warranty from the manufacturer. We also provide a 10-year construction warranty, allowing you to use it with peace of mind for a long time after a single 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 properties, so please feel free to consult 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 renovation company specializing in exterior renovations, performing complete in-house construction from temporary scaffolding to roofing and exterior wall painting. We are confident that our “cost, quality, and efficiency” 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 robust, and we have received positive feedback for our appropriate proposals that align with 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 roof overlay methods, 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!

Consultations via LINE are also very welcome◎

LINE

LINE

We are continuously updating our Instagram ◎ Please follow us!

Instagram
Instagram
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!