[Aoba-ku, Yokohama] | Roof Renovation | We performed solar panel removal and roof replacement work!

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 an exterior renovation in Midori-ku, Yokohama.
This roofing renovation involves a roof overlay (cover method) using Super Galtect and solar panel removal and reinstallation!

We also carried out waterproofing work on the balcony!

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

We can also handle the removal and disposal of broken solar panels that are no longer in use!

Construction Data in Midori-ku, Yokohama

Roof Overlay Construction Procedure

1. Removing Solar Panels

We will dismantle the solar panels and the base brackets. The removed solar panels will be carefully stored in our warehouse for reuse. The existing base brackets are designed for slate and require direct holes to be made in the roof, so they will be disposed of. The holes left by the brackets will be sealed and repaired with caulking. We will also dismantle any unnecessary existing ridge flashing and snow guards!

2. Dismantling Existing Roofing Materials

We will dismantle the existing roofing materials! The existing roofing materials are “Nichiha/Pamir,” which cannot be painted. As the roofing materials are peeled off, many fragments will be produced, so we will also clean to prevent clogging in the rain gutters.

3. Installing Roofing (Waterproof Sheet)

We will lay the roofing sheet (waterproof sheet) on top of the underlayment! Theroofingused isTajima Roofing/Tadis Self Cover!
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 about 30 years!
As a primary 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.
When selecting a roofing sheet, choose one with a durability as close as possible to the new roofing materials! New liner roofing is relatively close in durability to Super Galtect, so we recommend using new liner roofing when performing roofing work with Super Galtect!

4. Fabrication of Accessories (Curlicue & Eaves)

Before the main roof construction, we will process and install components such as eaves and decorative scrolls!
The components used are genuine parts from Galttect, made of SGL copper plate!

5. Main Construction (Aiji Industry/Super Galttect)

After processing the components, we will install the Galttect main roof up to the ridge. After processing the components, we will install the Galttect main roof up to the ridge!
The fixation of the roofing material was done using “Aiji Industry’s roof renovation screws” from the Galttect manufacturer!
Since they are made of stainless steel and treated with disco processing, they are resistant to rust and have higher wind resistance compared to nails!

Once the roofing is completed up to the ridge, we will install the necessary ridge base to secure the ridge cap. We offer three types of ridge base (nail board): cedar, resin, and galvalume steel, and this time we used galvalume steel!
Galvalume steel is expected to have three times the durability compared to cedar! Unlike resin and cedar, it does not crack, making it reliable!
We recommend choosing a ridge base with a durability similar 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 made of galvalume steel.

Our original integrated waste board 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! It is optimal for the ridge base of Super Galttect!

6. Ridge Cap 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. At the wall edge, we will process and install a component called rain guard metal.
We use stainless steel nails and screws that are resistant to rust!

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 installation, by attaching a face plate inside the ridge cap, waterproofing is enhanced!
We will firmly protect the ridge, which is a critical point of the roof.

7. Installation of Solar Panel Mounting Brackets

We will install the mounting brackets for the solar panels that we have stored for reuse! The existing base was fixed by making holes in the roof, but the new brackets will catch the Galtect main body to secure the solar panels. This reduces the risk of leaks and the burden on the roof by not making holes.
There are applicable brackets for each manufacturer and model of solar panels. There may be no applicable brackets for older solar panels.

8. Installation of Solar Panels

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

9. Cleaning

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

About Roofing Materials

The roofing material used is the Super Galtect from Aijii Industrial.
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 from 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 parts where the roofing materials overlap, and the surface is coated with a high heat-reflective paint, allowing for a cool summer and warm winter experience.
Additionally, it has soundproofing properties, which help reduce the sound of rain.
Moreover, it is lightweight compared to other roofing materials, which reduces the sway during earthquakes, making it a good earthquake countermeasure.
It excels in finish, durability, insulation, soundproofing, and wind resistance, and the Super Galtect from Aijii Industrial is the most frequently used in our construction projects, 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, we completed a roof replacement project using Shade Blue, and it turned out exceptionally well!
The customer was very satisfied, and I was also very happy!
Thank you very much!

Please check out our other roofing project achievements here!

Balcony Waterproofing Construction Procedure

1. High Pressure Washing

First, we will clean the surface with high-pressure washing! We will be careful as excessive pressure can damage the existing waterproof layer! Any obstacles to the waterproofing work, such as outdoor units, will be moved or lifted.

2. Surface Preparation and Roughening

To improve the adhesion of the paint, we will create fine scratches on the surface to be painted! This is known as surface preparation! We will roughen the smooth surface!

2. Acetone Wiping

Next, we will perform acetone wiping! This is also an important surface preparation step. Acetone wiping involves removing the oil film from the FRP waterproof surface! Skipping this step can lead to paint peeling.

3. Primer Application (First Coat)

The primer acts as an adhesive that promotes the adhesion between the waterproof layer and the topcoat!

4. Topcoat Application

The topcoat is generally applied in two layers!
Once finished, we will check for any missed spots.

5. Balcony Waterproofing Work Completion

The balcony is complete once it dries! For the balcony waterproofing, we used Kanae Chemical / Water-Based FRP Waterproof Top Coat!

We were able to finish beautifully once again!

Please check out other painting work achievements from here!

Roofing Materials Used for Roof Repair

Roofing Material	IG Kogyo / 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

Flow of Exterior Renovation Work by Kakeru Koumuten

1. Contact Us

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

2. On-Site Investigation & Estimate

We will set 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 details and costs!

3. Decision on whether to proceed with exterior renovation work

Based on the inspection results and estimate, we will ask for your decision.

You can rest assured that we will not pressure you into proceeding with the work!

It is also fine to compare with estimates from other companies before making your decision!

4. Contract and scheduling of work dates

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

5. Start of construction

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

6. Completion of construction (photo confirmation)

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.

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

7. Payment

Leave your roof renovation in Midori-ku, Yokohama to Kakeru Koumuten Co., Ltd.!

Community-focused service

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

Midori-ku, Yokohama has many highlands and lowlands, resulting in significant topographical changes. We recommend using wind-resistant roofing materials in highland areas where wind exposure is high!

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

Summary

These are our construction achievements for roof renovations in Midori-ku, Yokohama!
We have handled scaffolding setup, solar panel removal and reinstallation, roof replacement work, and balcony waterproof painting, all with our own team!

When renovating a roof with solar panels, please note that the cost of removing and reinstalling the solar panels can be significant, so we recommend using durable roofing materials that will last with a single renovation!
There may be cases where the new roofing materials do not allow for the solar panels to be placed as they were originally, so be sure to confirm with the contractor!

Estimates and inspections are, of course, free!

If you have any concerns regarding “roof, rain gutters, exterior walls, or exterior structures” in Midori-ku, Yokohama, please consult 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 when it comes to exterior renovation work, we do not fall behind other companies in terms of cost, quality, and efficiency!

We are confident in our exterior renovations, so we welcome competitive estimates!
We also offer comprehensive construction guarantees and aftercare maintenance, and we have received positive feedback for our appropriate proposals that match 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!

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