Miyamae-ku, Kawasaki | Roofing | We performed roof repairs using solar panel removal and the roof overlay (cover method)!

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 project in Miyamae-ku, Kawasaki City.
The work this time involves the Hiranbee 220 roof overlay (cover method) and solar panel removal and reinstallation!

When performing a roof overlay on a roof with solar panels, it is essential to remove and reinstall the solar panels.
The base rack (hardware) for the slate solar panels is fixed directly to the roof by drilling holes.
The base rack for the Hiranbee 220 solar panels uses a catch method that secures the rack without drilling holes directly into the roof material.

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

 

Construction Data for Miyamae-ku, Kawasaki City

Construction Location

Kawasaki City, Miyamae-ku

Construction Details

Temporary scaffolding installation, roof overlay (cover method), solar panel removal and reinstallation

Inquiry Details

I am concerned about the deterioration of my roof and would like to do a roof renovation. However, since there are solar panels installed, I contacted you after learning that your company can perform solar panel removal and roof overlay (cover method) near Miyamae-ku.

Existing Base/Materials Used

Materials used for roof overlay (cover method): Hiranbee 220

Price Range

1,000,000 – 1,500,000 yen

Construction Period

2 weeks

Completion Month

September 2023

Roof Overlay Construction Procedure

1. Temporary Removal of Solar Panels

We will temporarily dismantle the solar panels. The removed solar panels will be reused, so we will carefully store them to protect them from rain. The existing slate base rack will be dismantled and disposed of. We will also repair any holes left in the roof after disposal.

2. Installing Roofing (Waterproof Sheet)

Next, we will apply the waterproof sheet! The roofing used is Jouyu Pulp Industry/Sunlight G!
This material is modified asphalt roofing, which is said to have twice the durability of regular asphalt roofing.
If the roofing is solid and serves its primary waterproofing role, there will be no leaks! We will ensure it is firmly applied to prevent it from blowing away.

3.Accessory Processing (Karakusa and Keraba)

Before the main roof construction, we process accessories such as keraba and karakusa for installation!

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

4.Main Construction (Inagaki Shouji/Hiranbee 220)

After processing the accessories, we will install the Hiranbee main body up to the ridge! Snow guards will also be installed while laying the roofing material!
Once we reach the ridge, we will install the necessary materials to secure the ridge board, known as kanban. There are various types of kanban made from cedar, resin, and galvalume copper, and this time we used cedar!

5.Ridge Cap and Wall Flashing (Rain Guard) & Sealing at Various Locations

Next, we will process and install the ridge cap. We will thoroughly apply sealing on the inside of the joints. For the wall, we will process and install a rain guard flashing.
We use stainless steel nails and screws that are resistant to rust for securing!

6.Installation of Solar Panel Racks

After completing the roofing work, we will install racks for the solar panels! Since it is a catch-type installation that does not require drilling holes in the roof, it is safe from leaks!

7.Installation of Solar Panels

We will return the removed solar panels to their original position to complete the job! 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 or rain gutters. We will thoroughly remove nails and metal scraps to prevent injuries. The balcony will also be restored to its original condition, completing the work!

About Roofing Materials

The roofing material used is Hiranbi 220 from Inagaki Shouji.
Hiranbi 220 comes with a manufacturer warranty of 15 years for the coating and 25 years for perforation.
For re-roofing and roof overlay, we also provide a 10-year construction warranty!
If there are any leaks within 10 years, we will make repairs free of charge.
Made of Galvalume steel, it is resistant to rust.
The formed panels feature an iris fold and ripple processing to prevent distortion and enhance strength, as well as improve water drainage and aesthetic effects.

Additionally, it excels in finish, durability, sound insulation, and wind resistance, and is lightweight compared to other roofing materials, which reduces the sway during earthquakes, making it a good earthquake countermeasure.
In the recent overlay (cover) work, the roof becomes double-layered, which increases the weight; however, Hiranbi is a lightweight roofing material, making it suitable for overlay (cover) work.

Color

Extreme – MAX Type
■ Gray Silver

■ Silver Black

■ Sepia

■ Moss Green

■ Bamboo Green

■ Midnight Blue

■ Jet Black

■ Dark Brown

■ Bright Red

Standard Type
■ Steel Black

■Marron Brown

■J Silver

You can choose from these options!

This time, the cover work with Jet Black turned out exceptionally well!
Thank you for your request!!

Please check out other roofing work examples from here!

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 produced.
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 replacements.
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 constructions 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 overlay method, which produces 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 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, the construction can be completed in a shorter period than painting or full replacements. A shorter construction period means lower labor costs, which in turn makes the overall cost more affordable.
The psychological anxiety of having to live in an unusual environment is also reduced.
If scaffolding is set up, you may experience inconveniences such as difficulty entering and exiting or opening windows. Being able to return to your normal life in a short time 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 consistently have ongoing projects for roof overlay work.

Post-Construction Maintenance

◇Importance of Maintenance After Construction

Maintenance after exterior painting and roof repairs is a crucial factor in extending the lifespan of your home. Neglecting maintenance can lead to rapid deterioration of newly painted exteriors and repaired roofs, resulting in the risk of incurring high costs. The exterior walls and roofs of buildings are constantly exposed to harsh natural environments such as rain, wind, UV rays, and temperature changes. Regular maintenance can minimize damage and help maintain the beauty and comfort of your home. Additionally, it can help avoid large-scale repair work and the associated significant expenses.

◇Maintenance Methods and Frequency

One effective maintenance method after construction is inspections by specialized contractors. This allows for early detection and repair of even minor damages. The recommended frequency for maintenance is generally exterior painting every 5 years and roof repairs every 3 years. This is merely a guideline and may vary depending on local climate conditions and the structure of the house.

Free Consultation

Roof Material	Inagaki Shoji/Hiranbi 220
Manufacturer Warranty	15 years for coating, 25 years for perforation
Expected Durability	Approximately 35 years
Color Used This Time	Jet Black

Leave Your Roof Renovation in Miyamae-ku, Kawasaki to Kakeru Koumuten!

Our company has extensive experience in roof renovations in Miyamae-ku.
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 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 based in Aoba-ku, Yokohama, we have handled many roof renovations in the neighboring Miyamae-ku and have a deep understanding of the needs of local customers. Whether you want to “make it last long with one renovation,” “keep costs down,” or “improve insulation because the indoors are hot,” we provide optimal solutions for your specific requests.

Many Inquiries from Kawasaki City!

Geographically, we receive many requests for roof repairs not only from Yokohama City but also from nearby Kawasaki City. If you are facing any issues with roof repairs or have any consultations, please feel free to contact us. We serve all areas of Kawasaki City, including Miyamae-ku. For any roof-related concerns, please consult Kakeru Koumuten, which is highly supported by customers from both Yokohama City and Kawasaki City.

Conclusion

Estimates and inspections are, of course, free!

If you have any issues with ‘roof, rain gutter, exterior wall, or exterior structure’ in Miyamae-ku, Kawasaki City, 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.
When it comes to exterior renovation work, we are confident that we do not fall short compared to other companies in terms of cost, quality, and efficiency!

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!

We want you to think, “I’m glad I asked them!” Therefore, we take every request we receive seriously.

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!

LINEConsultations via LINE are also very welcome◎

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!