[Kanazawa-ku, Yokohama] | Cracks Occurred in Slate Roof Over 20 Years Old | We Performed Solar Panel Removal and Roof Overlay (Cover Method)!

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 Kanazawa-ku, Yokohama.
This roof repair involves the roof overlay (cover method) using Super Galtect and solar panel removal!

For this project, we handled the installation and removal of solar panels for our customer!

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 we have extensive experience with it!

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

Roof Repair in Kanazawa-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 to be safe. We will dismantle any unnecessary existing ridge flashing and snow stops as well!

2. Roofing Installation (Waterproof Sheet)

Next, we will install the roofing sheet (waterproof sheet)! The roofing used is Tajima Roofing/Daddy’s Self Cover!
This is a top-quality underlayment that boasts unmatched waterproofing and durability. By sandwiching a modified asphalt layer between non-woven fabric and base paper, it fully demonstrates the inherent performance of modified asphalt.
The expected durability is about 30 years!
As a secondary waterproofing measure, if the roofing is properly installed, there will be no leaks! We will ensure it is securely attached to prevent it from blowing away.

3. Custom Fabrication (Kera and Karakusa)

Before the main roof construction, we will fabricate and install custom pieces such as kera and karakusa!
We will use the genuine parts from Galtect, specifically the SGL copper plate!

4. Main Construction (Aiji Industry/Super Galtect)

At the ridge, we will install the necessary base for fixing the ridge flashing. We offer three types of batten (ridge base): cedar, resin, and Galvalume steel, and this time we used Galvalume steel!
Galvalume steel has an expected durability that is three times greater than that of cedar! Unlike resin or cedar, it does not crack, providing peace of mind!
We recommend choosing a ridge base that has a durability close to that of the new roofing material, just like the roofing sheet.
For the lower ridge (corner ridge), we will use our original integrated waste board type Galvalume steel ridge base.

Our original integrated waste board made of Galvalume steel 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, demonstrating high waterproofing performance! It is ideal for the Super Galtect roof 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 joints.
This photo shows the ventilation ridge, which is the area that allows heat and humidity from the attic to escape. The customer also had a new ventilation ridge cap installed! The ventilation ridge cap is also made of SGL steel plate!
The screws used for fixation are made of stainless steel, which is resistant to rust!
We are also using a high-durability sealing material called Auton Exceed. General sealing materials have a durability of about 10 years, but high-durability sealing lasts about 30 years. Since leaks can occur from the sealing, we use high-quality materials even for the finer details!

Pack screws are less likely to come loose compared to nails, securely fixing 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.

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 injury. Additionally, we will wipe away any footprints left on the roof to ensure it looks clean.

About Roofing Materials

The roofing material used is Aijii Industrial’s Super Galtect.
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 plates, it is resistant to rust.
Insulation material is tightly applied from edge to edge of the roofing material, creating a metal plate that integrates steel and insulation.
When installed, insulation is applied even to the areas where the roofing materials overlap, and the surface is coated with a highly heat-reflective paint, allowing for a cool summer and warm winter experience.
Additionally, it has soundproofing properties, which reduce the sound of rain.
Moreover, it is lightweight compared to other roofing materials, which minimizes the sway during an earthquake, making it a good earthquake countermeasure.
It excels in finish, durability, insulation, soundproofing, and wind resistance, and our company’s track record shows that Aijii Industrial’s Super Galtect is the most frequently used, gaining significant attention!

Color

■Shade Black

■Shade Brown

■Shade Blue

■Shade Moss Green

■Shade Charcoal

■New Color Shade Wine Red

You can choose from these 6 colors!

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

Please check out other roofing work achievements from here!

Roofing materials used for roof repair

Roof Material	Aiji Gyo Co., Ltd. / Super Galtect
Manufacturer Warranty	Coating 15 years, Red rust 20 years, Puncture 25 years
Expected Durability	About 40 years
Color Used This Time	Shade Blue

What is the Roof Overlay (Cover Method)?

The roof overlay method involves leaving the current roof almost intact 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, 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 its most significant feature, leading to various advantages.

The only parts that require demolition and waste disposal are the ridge caps, making it more cost-effective compared to complete roof replacement.
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).
Some building materials used in structures constructed before 2004 contain asbestos. Asbestos-containing materials are challenging to demolish due to their high environmental impact, resulting in high costs for both demolition and waste disposal. The overlay method, which generates almost no waste, is ideal for such roofs.

Some may wonder, “Is it safe to live in a building with 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 timeframe than painting or roof replacement. A shorter construction period means lower labor costs, which in turn makes the expenses more affordable.
The psychological anxiety of having to live in an unusual environment is also reduced.
When scaffolding is set up, 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 have been continuously engaged in roof overlay (cover method) projects without interruption.

Process of Roof Repair at Kakeru Koumuten

1. Contact Us

First, please let us know the condition of your roof and other details via phone or email!

2. On-Site Inspection & Estimate

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

We will check the shape, material, and installation status 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, we will ask for your decision.

Rest assured, we will not pressure you into proceeding with the work!

You are welcome to compare our estimate with others before making your decision!

4. Contract & Schedule Construction

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, while considering your convenience, we will schedule the construction dates.

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)

You will review the explanation of the repair items and the photos of the completed exterior walls and roof, and then the handover will take place.
We will also provide you with a construction warranty and a manufacturer 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 your payment method from the three options above.

For Roof Repairs in Kanazawa-ku, Yokohama, Trust Kakeru Koumuten!

Community-Focused Service

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

Whether you want a roof that lasts long with a single renovation, wish to keep costs down, or want to improve insulation performance because your indoors are too hot, we will propose the best plan tailored to your specific requests!

Summary

That concludes our track record of roof repairs in Kanazawa-ku, Yokohama!

We have handled everything from scaffolding setup, solar panel removal, to roof overlay (cover method) all in-house!

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 a single renovation!
There may be cases where the new roofing materials do not allow for the solar panels to be placed as before, so be sure to confirm with the contractor!

Unnecessary solar panels and water heaters can burden the building and increase the risk of leaks, so if they are not in use, it is advisable to dispose of them!
We are also happy to assist with just solar panel removal or just water heater removal.

Estimates and inspections are, of course, free of charge!

If you have any issues regarding “roof, rain gutters, exterior walls, or exterior structures” in Kanazawa-ku, Yokohama, please consult with Kakeru Koumuten Co., Ltd. in Aoba-ku, Yokohama!

Kakeru Koumuten Co., Ltd. is a remodeling company strong in exterior renovations, and we carry out everything from temporary scaffolding work to roof work and exterior painting completely in-house.
We are confident that our ‘ cost, quality, and efficiency ‘ are unmatched compared to other companies when it comes to exterior renovation work!

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 roof construction 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◎