[Kanagawa Prefecture, Fujisawa City] | Roof Repair | Performed roof overlay (cover method) using Alma!

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 project in Fujisawa City, Kanagawa Prefecture.
The work involved exterior painting and a roof overlay (cover method) using Alma!

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

Construction Data for Fujisawa City, Kanagawa Prefecture

Exterior Wall Painting Construction Procedure

1. High-Pressure Washing

First, we thoroughly wash the exterior walls with high-pressure washing to remove dirt and moss! If any dirt remains, it can affect the adhesion and durability of the paint, so we wash carefully.
We also cleaned the balcony and exterior structures, as well as the stairs and inside the rain gutters!

2. Surface Preparation

After high-pressure washing, we assess the deterioration of the exterior wall and perform surface preparation, including crack repairs.

3. Protection of Various Parts

Next, we will protect areas that will not be painted, such as windows, sashes, and floors, using masking tape, blue sheets, and polymer tarps. This is a very important task in the painting process! If we neglect the protection, gaps may form, allowing paint to seep in, or we may not achieve clean lines.

4. Primer Coat

This is the first step of applying paint after high-pressure washing and surface preparation. It is the primer that ensures that the middle and top coats adhere well to the surface. By applying the primer properly, there will be a significant difference in durability and finish!

The primer we use has surface adjustment properties, which can also seal fine cracks! The premium filler used is compatible with existing finishing paints, especially suitable for mortar exteriors.

5. Middle Coat

Next is the middle coat. This is a crucial step to bring out the performance of the paint, achieve a beautiful finish, and eliminate unevenness!

6. Top Coat

Next is the top coat. This is the finishing touch for the exterior wall painting. We will focus on ensuring there are no uneven spots or missed areas, achieving a beautiful finish! We used SK Kaken’s premium silicone paint. The manufacturer’s expected durability is said to be about 14 to 16 years.

7. Painting of Auxiliary Parts (Canopy Metal, Shutters, Rain Gutters, Eaves, Fascia, Soffit)

Canopy Metal

Shutters

Rain Gutters

Soffit

For the attached parts, after finishing the surface preparation such as scraping, for metal parts, we apply a primer with rust prevention, followed by a mid-coat and top-coat with Yumelock. We ensure to paint every detail thoroughly! The eaves, fascia, and soffit are made of the same material as the exterior walls, so we will paint them with SK Kaken/Premium Silicon!

The exterior wall painting work is complete!

Roof Overlay Construction Procedure

1. Demolition of Existing Ridge and Snow Stops

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

2. Installing Roofing (Waterproof Sheet)

The roofing used is Jouyu Pulp Industry/Sunlight G!
It is made from modified asphalt roofing, which is said to have double the durability of regular asphalt roofing.
With the roofing serving as the primary waterproofing, if it is properly installed, there will be no leaks! We will ensure it is securely attached to prevent it from blowing away.

4. Component Processing (Curly Patterns & Eaves)

Before the main roof construction, we will process components such as eaves and curly patterns!
The materials used for the components are galvalume steel sheets.

4. Main Construction (Nichiwa/Alma)

After processing the components, we will install the Alma main roofing up to the ridge! We will also ensure that the single cement is properly applied during the installation.
Once the roofing is completed up to the ridge, we will install the necessary materials to secure the ridge cap, known as the “kanban.” There are types made from cedar and resin, and this time we used the resin type!
The resin type is expected to have twice the durability compared to the cedar type!

5. Ridge Cap Processing & 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 a rain guard metal.
We use stainless steel nails and screws that are resistant to rust for fastening!

Unlike nails, screws with packing are less likely to come loose and securely fasten the ridge cap to the base board!

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 part of the roof.

6. Cleaning

We will clean up the debris that has fallen onto the balcony and rain gutters. We will be thorough in our cleaning as nails and metal scraps 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!
Additionally, because it uses fine natural stones 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 an earthquake, making it a good earthquake countermeasure.
In the roof overlay (cover method) 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 the overlay (cover method) work.

Colors

■ Black AR

■ Gray AR

■ Green AR

■ Brown AR

■ Camel AR

This time, the roofing work with Black AR turned out exceptionally well!
The customer was very satisfied, and I was also very happy!
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.
It is literally a method of covering a roof with another roof. Therefore, the roof becomes double-layered. Since the roof is layered, it is also referred to as “overlapping roofing.”

Benefits of the Cover Method

Since the “new roof” is placed over the “existing roof,” demolition work is almost unnecessary, meaning that very little waste material is generated.
This is the most significant feature, leading to various benefits.

The only parts that require demolition and waste disposal are the ridge flashing, 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 refer to the Ministry of Health, Labour and Welfare 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 us.

Additionally, the construction can be completed in a shorter time frame compared to painting or complete roof replacement. A shorter construction period means lower labor costs, which in turn makes the overall cost lower.
The psychological anxiety of having to live in an unusual environment is also reduced.
If scaffolding is erected, 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 type of work we undertake. We are very grateful that we have been continuously engaged in 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	Black AR

Paint Used for Exterior Wall Coating

Exterior Wall Coating Paint
Wall Color	Exterior Wall/Eaves/Facia: Premium Silicon SR-403             Rain Gutter: Yumelock N90             Shutters/Canopy Metal: Yumelock 15-20B

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

Our company has extensive experience in roof renovations in Fujisawa 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 throughout 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 carry out complete in-house construction from temporary scaffolding work to roof work and exterior wall painting work.
We are confident that our “cost, quality, and good planning” will not be outdone by other companies in exterior renovation work!

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 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 roof overlay methods, 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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