[Aisa-ku, Yokohama] | Roof Repair | Solar Panel Removal and Roof Overlay (Cover Method) Completed!

BEFORE

AFTER

Hello!
We are Kakeru Koumuten Co., Ltd., a specialist in roofing, exterior wall painting, and exterior renovations located in Aoba-ku, Yokohama, Kanagawa Prefecture!
This is a case study of an exterior renovation in Asahi-ku, Yokohama.
This roof repair involves the roof overlay (cover method) using Super Galtect and solar panel removal!

In this case, the customer requested the removal of the solar panels rather than their installation or reinstallation, so we handled the removal and disposal ourselves!

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

The roofing material used for this roof repair, “Super Galtect”, is the most commonly handled roofing material by our company and has a wealth of proven results!

Koumuten often receives requests for solar panel installation and removal only.
Please leave the removal of solar panels associated with roof painting or roof overlay work to Koumuten!

We can also handle the removal and disposal of malfunctioning solar panels like in this case!

Roof Repair in Asahi-ku, Yokohama – Construction Data

Roof Overlay Construction Procedure

1. Solar panel removal

We will dismantle the solar panels and the base brackets. The removed solar panels will be disposed of by our company! We will also repair the areas where the base brackets were removed with sealing material just in case. We will dismantle any unnecessary existing ridge flashing and snow guards as well!

2. Roofing Installation (Waterproof Sheet)

Next, we will install the roofing sheet (waterproof sheet)! The roofing used is Tajima Roofing/New Liner Roofing!
This underlayment boasts the highest quality, unmatched in both waterproofing and durability. By sandwiching a modified asphalt layer between non-woven fabric and base paper, it fully exhibits the inherent performance of modified asphalt.
The expected durability is approximately 30 years!
As a primary waterproofing measure, if the roofing is properly installed, there will be no leaks! We will ensure it is securely adhered to prevent it from blowing away.
When selecting a roofing sheet, choose one with a durability as close as possible to the new roofing material! New Liner Roofing has a durability relatively close to Super Galtect, so we recommend using New Liner Roofing when performing roofing work with Super Galtect!

3. Custom Fabrication (Karakusa & Keraba)

Before the main roofing work, we will fabricate and install custom pieces such as keraba and karakusa!
The custom pieces used are genuine Galtect parts made of SGL copper plate!

4. Main Construction (Aiji Industrial/Super Galtect)

At the ridge, we will install the necessary ridge base to secure the ridge cap. The materials we handle for the ridge base include three types: cedar, resin, and galvalume steel. This time, we used galvalume steel!
Galvalume steel is expected to have three times the durability compared to cedar! Unlike resin or cedar, it does not crack, providing peace of mind!
We recommend choosing a ridge base with a durability similar to that of the new roofing materials, just like the roofing sheet.
For the lower ridge (corner ridge), we use our original integrated waste board type ridge base made of galvalume steel. [/chat]

Our original integrated waste board type ridge base made of galvalume steel is highly durable, has strong fixation, and excellent wind resistance! Even if rainwater enters from the ridge, it has a mechanism to discharge rainwater to the outside, demonstrating high waterproofing performance! It is perfect for the Super Galtect ridge base!

5. Ridge Cap, Ventilation Ridge, and Sealing at Various Locations

Next, we will process and install the ridge cap. We will firmly apply sealing on the inside of the joint.
The second photo shows the ventilation ridge, which allows heat and humidity from the attic to escape outside. This time, we also installed a new ventilation ridge cap for the customer! The ventilation ridge cap is made of SGL steel plate!
The screws used for fixing are made of stainless steel, which is resistant to rust!
We are also using a high-durability sealing material called Auton Exceed. Regular sealing materials have a durability of about 10 years, while high-durability sealing lasts about 30 years. Since leaks can occur from the sealing, we use high-quality materials even for the finer details!

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

Although it is not visible after installation, by attaching a face plate inside the ridge cap, we enhance waterproofing!
We will thoroughly protect the ridge, which is a critical point of the roof.

8. Cleaning

We will clean up any debris that has fallen onto the balcony or rain gutters. We will thoroughly remove items like nails and metal scraps that could cause injuries. Additionally, we will wipe away any footprints left on the roof to keep it clean.

About Roofing Materials

The roofing material used is the Super Galtect from Aijii Industry.
The Super Galtect comes with a manufacturer warranty of 15 years for the coating and 25 years for perforation.
Our company also provides a 10-year construction warranty!
Made of SGL steel plate, it is resistant to rust.
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.
Additionally, it has soundproofing properties, reducing the sound of rain.
Moreover, it is lightweight compared to other roofing materials, which minimizes the sway during earthquakes, providing earthquake resistance.
It excels in finish, durability, insulation, soundproofing, and wind resistance, and the Super Galtect from Aijii Industry is the most frequently used in our construction achievements, gaining significant attention!

Colors

■ Shade Black

■ Shade Brown

■ Shade Blue

■ Shade Moss Green

■ Shade Charcoal

■New Color Shade Wine Red

You can choose from 6 colors!

This time, the cover work was completed very well with Shade Charcoal!
The customer was very satisfied, and I was also very happy!
Thank you very much!

Please check out other roofing work achievements here!

Roofing Materials Used for Repair

Roofing Material	IG Kogyo/Super Galtect
Manufacturer Warranty	Coating 15 years, Red Rust 20 years, Perforation 25 years
Expected Durability	About 40 years
Color Used This Time	Shade Charcoal

What is the Roof Overlay 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 on top of another, it is also referred to as “overlapping roofing.”

Benefits of the Roof Overlay Method

Since we place a “new roof” 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 benefits.

The only parts that require demolition and waste disposal are the ridge cap, so compared to a complete roof replacement, the cost is lower.
In 2004, regulations regarding the concentration of asbestos in raw materials were changed (please refer to the Ministry of Health, Labour and Welfare’s website for details).
Some building materials used in structures built before 2004 contain asbestos. Asbestos-containing materials are difficult to demolish due to their high environmental impact, and the costs for demolition and waste disposal are also high. The roof overlay method, which generates almost no waste, is ideal for such roofs.

Some may wonder, “Is it safe to live in a building that uses asbestos-containing materials?” but rest assured. As long as there is no destruction or crushing, it will not disperse into the air.
If you are unsure about the type of roof on your home, please feel free to consult with us.

Additionally, we can complete the work in a shorter time frame than painting or a full roof replacement. A shorter construction period means lower labor costs, which in turn reduces overall expenses.
This also alleviates the psychological anxiety of having to live in a different environment than usual.
When scaffolding is set up, there may be inconveniences such as difficulty entering and exiting or opening windows. Being able to return to normal life in a short period is a significant advantage.

Our company specializes in roofing work, and the roof overlay method is the most frequently performed service we offer. We are very grateful that we have been continuously engaged in roof overlay projects without interruption.

Process of Roof Repair at Kakeru Koumuten

1. Inquiry

First, please let us know the condition of your roof, etc., by phone or email!

2. On-Site Investigation & Estimate

We will arrange a date and time for the on-site investigation based on your preferences and visit your home.

We will check the shape, material, and installation conditions of the roof and building.

After that, we will create and provide you with an estimate that includes the necessary work and costs!

3. Decision on Roof Repair

Based on the inspection results and estimate, you will make the decision.

Please rest assured that we will not pressure you into proceeding with the work.

You are welcome to compare estimates with other companies before making your decision!

4. Contract & Scheduling

Once you have thoroughly reviewed the estimate and decided to proceed with Kakeru Koumuten, we will have you fill out the contract (by mail or in person) and discuss your availability to schedule the work.

5. Start of Construction

Experienced workers will carry out the construction responsibly! Depending on the nature of the work and weather conditions, the planned construction period may shift or extend.

6. Completion of Construction (Review Photos)

We will explain the repair items and provide you with photos of the completed exterior walls and roof before handing them over.
We will also provide you with a construction warranty and a manufacturer’s warranty.

If you have any concerns at that time, please feel free to let us know!

7. Payment

・Bank transfer
・Cash
・Renovation loan
You can choose from the three payment methods above.

For roof repairs in Asahi-ku, Yokohama, trust Kakeru Koumuten!

Community-Focused Service

We are an exterior renovation company located in Aoba-ku, Yokohama, and we have handled many roof renovations in the nearby Asahi-ku, deeply understanding the needs of our local customers.
Additionally, Kakeru Koumuten Co., Ltd. has a materials storage site in Kamikawaicho, Asahi-ku, where we store temporary scaffolding and roofing materials.
This allows us to minimize transportation costs and respond quickly.

Whether you want to “make it last long with one renovation,” “keep costs down as much as possible,” or “improve insulation performance because the indoors are hot,” we will propose the best plan tailored to your specific requests!

Summary

This concludes our track record of roof repairs in Asahi-ku, Yokohama!

We handled all aspects of temporary scaffolding, solar panel removal, and roof overlay work with our own team!

When renovating a roof with solar panels, please note that the cost of removing and reinstalling solar panels can add up, so we recommend using durable roofing materials that will last long with one renovation!
There may be cases where the new roofing materials do not allow for the existing placement of solar panels, so be sure to confirm with your contractor!

Unnecessary solar panels and water heaters can burden the building and increase the risk of leaks, so if they are not in use, we recommend disposing of them!
We are happy to assist with solar panel removal only or water heater removal only as well.

Estimates and inspections are, of course, free!

If you have any concerns regarding ‘roofing, rain gutters, exterior walls, or exterior structures’ in Asahi-ku, Yokohama, please consult with Kakeru Koumuten Co., Ltd. in Aoba-ku, Yokohama!

Kakeru Koumuten is a renovation company strong in exterior renovations, and we handle everything from temporary scaffolding work to roofing work and exterior wall painting work 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!
We offer comprehensive construction guarantees and aftercare maintenance, 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 the roof overlay method, so please feel free to take a look!

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

Helpful information about exterior renovations can be found here!

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