Construction example

Odawara City, Kanagawa Prefecture | We performed roof overlay using Ridgeway and detached solar panels!

BEFORE

AFTER

Hello!
We are 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 exterior renovations in Odawara City, Kanagawa Prefecture.
The work this time involves the roof overlay (cover method) using Ridgeway and solar panel removal and reinstallation!

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

Roof Overlay Construction Procedure

1. Temporary Removal of Solar Panels

We will temporarily dismantle the solar panels and the mounting brackets. The removed solar panels and brackets will be reused, so we will carefully store them in our warehouse. We will also dismantle any unnecessary existing ridge flashing and snow guards!

2. Installing Roofing (Waterproof Sheet)

Next, we will apply the waterproof sheet! The roofing material used is Jouyu Pulp Industry/Sunlight G!
This is a modified asphalt roofing material, which is said to have double the durability compared to regular asphalt roofing.
With the roofing serving as the primary waterproofing, if it is properly installed, there will be no leaks! We will ensure it is securely applied to prevent it from blowing away.

3.Accessory Processing (Karukusa and Keraba)


Before the main roof construction, we process accessories such as keraba and karukusa!

The materials used for the accessories are made of galvalume steel.

4.Main Construction (Asahi Fiberglass/Ridgeway)

After processing the accessories, we will install the Ridgeway main material up to the ridge! We will apply single cement at the overlapping areas during the installation.
Once installed, we will set up necessary materials called “kanbari” to secure the ridge cap. The kanbari can be made of cedar or resin, and this time we used cedar!

5.Ridge Cap and Sealing at Various Locations

We will process and install the ridge cap. We will apply sealing thoroughly on the inside of the joints.
The nails and screws used for fixing are made of stainless steel, which is resistant to rust!

6.Reinstallation of Solar Panel Brackets


We are installing the base brackets for the solar panels that were stored for reuse!

7. Installation of Solar Panels

We will return the removed solar panels to their original position, completing the installation! Finally, we will check to ensure they are generating power properly.

8. Cleaning


We will clean up any debris that has fallen onto the balcony and rain gutters. We will thoroughly remove items like nails and metal scraps that could cause injuries. The balcony will be restored to its original state, completing the work!

About Roofing Material (Ridgeway)

The roofing material used is Ridgeway from Asahi Fiberglass.
Ridgeway comes with a 10-year manufacturer warranty.
Since it uses natural stone that is baked onto the surface, it is a roofing material that does not require painting, thus reducing maintenance costs!
The fine natural stones used on the surface prevent issues with rain noise.
Additionally, it is a lightweight roofing material, making it strong against earthquakes and providing seismic resistance.

*After installation, the surface decorative stones may fall off for about a week, but this does not indicate a quality issue.

Colors

■Dual Black
Ridgeway Black

■Harvard Slate
Ridgeway Harvard Slate

■Vintage Green
Ridgeway Green

■Dual Brown
Ridgeway

■Earthtone Cedar

Ridgeway Earthtone Cedar

This time, we completed the roof work with Harvard Slate 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!

What is the Roof Overlay (Cover Method)?

The roof overlay method involves leaving the current roof almost as it is 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 itself, 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 and leads 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 details, please refer to the Ministry of Health, Labour and Welfare’s website).
Building materials used in constructions completed before 2004 may contain asbestos. Asbestos-containing materials are difficult to dismantle 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 of you may be wondering, “Is it safe to live in a building that uses materials containing asbestos?” Rest assured. As long as they are not destroyed or crushed, they 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 time frame 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 unusual environment.
When scaffolding is erected, you may experience inconveniences such as difficulty entering and exiting or being unable to open windows. Being able to return to your normal life in a short period is a significant advantage.

Our company specializes in roofing work, and the roof overlay (cover method) is the most frequently performed service we offer. We are very grateful that we are continuously able to carry out roof overlay (cover method) projects without interruption.

Roof Material

Asahi Fiberglass/Ridgeway

Fiberglass Ridgeway
Manufacturer Warranty 10 years
Expected Durability 25 to 30 years
Color Used This Time

Harvard Slate

Ridgeway Harvard Spray

Leave Your Roof Renovation in Kanagawa Prefecture to Kakeru Koumuten Co., Ltd.!

Our company has extensive experience in roof renovations within Kanagawa Prefecture.
We are happy to assist with everything from roof overlay work, roof replacement, to partial roof repairs such as leak fixes.
If you have any questions or concerns like “I just want to know the estimate for the roof renovation” or “I want to know about roofing materials,” please feel free to contact us!

As an exterior renovation company based in Aoba-ku, Yokohama, we have handled many roof renovations in Kanagawa Prefecture and have a deep understanding of the needs of our local customers.

“I want it to last long with just one renovation.”

“I want to keep costs as low as possible.”

“I want to improve insulation because the indoors are hot.”

We provide optimal solutions for specific requests like these.

Summary

Estimates and inspections are, of course, free! If you have any concerns regarding roofs, rain gutters, exterior walls, or exterior structures, please consult Kakeru Koumuten Co., Ltd. in Aoba-ku, Yokohama!

Kakeru Koumuten is a renovation company strong in exterior renovations, and we carry out everything from temporary scaffolding work to roof work and exterior wall painting completely in-house.
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, receiving high praise for our cost performance and appropriate proposals that align with 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 roof construction 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!

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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!