[Ebina City, Kanagawa Prefecture]｜Roof overlay work was performed on the roofing material “Colonial NEO” which is not suitable for painting!

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 project in Ebina City, Kanagawa Prefecture.
The work we performed this time is a roof overlay (cover method) by Alma!

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

Construction Data for Ebina City, Kanagawa Prefecture

Roof Overlay Construction Procedure

1. Demolition of Existing Ridge and Snow Stops

We will dismantle unnecessary parts (ridge cap) for the roof overlay! The lifespan of wooden purlins is about 10 to 15 years. Exceeding the lifespan can lead to corrosion and discoloration, resulting in the ridge cap coming off or being blown away.

2. Roofing Installation (Waterproof Sheet)

The roofing used is Tajima Roofing/Tadis Self Cover!
This is a self-adhesive roofing sheet specifically designed for the overlay method, suitable for fragile slates like Colonial NEO! Its lifespan is about 30 years, which is three times that of regular asphalt roofing, making it a highly durable roofing sheet.
As a secondary waterproofing measure, if the roofing is properly installed, there will be no leaks!
We will ensure it is firmly adhered to prevent it from blowing away.

4. Custom Fabrication (Karakusa and Keraba)

Before the main roofing work, we will fabricate and install components such as keraba and karakusa!
The materials used are galvalume steel sheets.

4. Main Construction (Nichiha/Alma)

After processing the components, we will install the Alma main body up to the ridge! We will also securely apply single cement during the construction.
Once we have installed it up to the ridge, we will place the necessary materials for fixing the ridge cap, known as the kanban. There are various types of kanban, including cedar, resin, and Galvalume steel plate, and this time we used a resin type!
The resin type is expected to have twice the durability compared to the cedar type!

5. Processing of Ridge Cap and Sealing at Various Locations

Next, we will process and install the ridge cap. We will thoroughly apply sealing on the inside of the joints. At the wall edge, we will process and install a component called the rain stop metal.
The screws with packing used for fixing are made of stainless steel, which is resistant to rust!

The screws with packing are less likely to come loose compared to nails, securely fixing the ridge cap to the kanban!

 

6. Cleaning

We will clean up any debris that has fallen onto the balcony or rain gutters. We will thoroughly carry out this task as nails and metal fragments can lead to injuries.

About Roofing Materials

The roofing material used is Nichiha’s Alma.
Alma 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!
With the fine natural stone used on the surface, you won’t be troubled by the sound of rain.

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 overlay (cover) work we performed this time, the roof becomes double-layered, which increases the weight, but Alma is a lightweight roofing material, making it suitable for overlay (cover) work.

Colors

■ Black AR

■ Gray AR

■ Green AR

■ Brown AR

■ Camel AR

This time, the roofing work with Gray AR turned out very well!
The customer was extremely satisfied, and I was very happy too!
Thank you very much!

Please check out other roofing work achievements from here!

What is the roof overlay (cover method)?

The roof overlay (cover 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. As a result, the roof becomes double-layered. Since the roof is layered, it is also referred to as “overlapping roofing.”

Advantages of the Cover Method

By placing a “new roof” over the “current roof,” there is almost no need for demolition work, 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 cap, making it more cost-effective compared to complete roof replacement.
In 2004, regulations regarding the concentration of asbestos in raw materials were changed (for more details, please visit the Ministry of Health, Labour and Welfare’s website).
Building materials used in structures constructed before 2004 may contain asbestos. Asbestos-containing materials are difficult to demolish due to their high environmental impact, resulting in high costs for both demolition and waste disposal. The cover 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, the construction can be completed in a shorter period than painting or full replacement. 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.
When scaffolding is erected, 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, but the roof overlay (cover method) is the most frequently performed type of work we undertake. We are very grateful that we are continuously able to carry out roof overlay (cover method) projects without interruption.

Roof Materials Used in Repairs

Roof Material	Nichiha/Alma
Manufacturer Warranty	10 years
Expected Durability	Approximately 20 years
Color Used This Time	Gray AR

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

We have extensive experience in roof renovations in Ebina City.
We are happy to assist with partial roof repairs, including roof overlay work, roof replacement, and leak repairs.
If you have any questions or concerns, such as “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 within 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.

Conclusion

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

Kakeru Koumuten is a renovation company strong in exterior renovations, and we conduct everything from temporary scaffolding work to roof work and exterior 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, 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 method, so please take a look if you’re interested!

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

Helpful information about exterior remodeling can be found here!

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