[Aoba-ku, Yokohama] | Leak Repair | Replacement of Rooftop Cap Flashing and Waterproof Top Coat

Hello!
This is Kakeru Koumuten Co., Ltd., a specialist in roofing, exterior wall painting, and exterior renovations located in Aoba-ku, Yokohama, Kanagawa Prefecture!
Here are some examples of our work on leak repairs in Aoba-ku, Yokohama, Kanagawa Prefecture.
The current project involves waterproofing work for the rooftop and balcony top coat, as well as metal work for the coping!

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

Construction Data

Cap Flashing Renovation Work Procedure

1. Removal of Existing Cap Flashing

We will remove the existing handrail and cap flashing!

As you can see in the photos, the substrate of the existing cap flashing was deteriorated due to water leakage.
Cap flashing is generally fixed with screws or nails from directly above, which is a “top-down” method that is NOT recommended.
It is essential to secure it from the sides or by gripping it.

We will dismantle it while being careful not to damage the exterior wall!

2. Installation of new cap flashing substrate and application of preservative

We cut the new base to match the size of the cap and secure it with screws!

We apply a wood preservative to the base.
By applying the preservative, there will be a significant difference in durability in the future.

3. Waterproof Sheet Installation

We will install the waterproof sheet on top of the base!
The waterproof sheet used is a modified asphalt roofing material, which is said to have twice the durability of regular asphalt roofing.
With the role of secondary waterproofing, if the roofing is secure, there will be no leaks!
We will firmly adhere it to prevent it from blowing away.

4. Installation of Galvalume Steel Cap

We will cover the existing cap with new Galvalume steel and secure it with screws on the sides.
To prevent rain from entering, we will thoroughly seal the joints.

5. Installation of Aluminum Handrails 【Balcony Only】

We will install aluminum handrails on the balcony cap. We will seal the handrail installation area to ensure rain protection.

With this, the installation work for the rooftop and balcony cap metalwork, as well as the balcony handrails, is complete.

Waterproof Top Coat Construction Procedure

1. High-Pressure Washing

First, we will perform high-pressure washing to remove dirt from the existing substrate. By cleaning, we will remove dirt and enhance the adhesion between the new top coat and the substrate.

2. Scraping and Roughening

To improve the adhesion of the top coat, we will perform surface preparation and roughening. By intentionally creating fine scratches on the surface of the substrate at this stage, we enhance the paint’s grip (adhesion).
When the application surface is smooth and free of irregularities like glass, compared to a surface with slight irregularities, the latter increases the contact area with the paint, making it easier for the new paint to adhere.

3. 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 waterproofing surface! Skipping this process can lead to paint peeling or bubbling.

4. Top Coat Application

The top coat is generally applied in two layers! After finishing the application, we will check for any missed spots.

6. Completion of Rooftop and Balcony Waterproofing Work

Once the top coat is dry, the work is complete!

We were able to complete the work beautifully!
The client was pleased with the construction details, and we are happy as well!

For leak repairs in Aoba-ku, Yokohama, trust Kakeru Koumuten Co., Ltd.!

Since our company is based in Aoba-ku, Yokohama, we have extensive experience in roof repairs and exterior painting in Tama-ku.
We are happy to assist with exterior painting, roof overlay (cover method), roof replacement, leak repairs, rain gutter work, and even partial roof repairs.
If you have any questions or concerns such as “I just want to know the estimate,” “I want to know about roofing materials,” or “I want to ask about rain gutter work,” please feel free to contact us!

We have handled many roof renovations in Kanagawa Prefecture, so we deeply understand the needs of our local customers.

“I want it to last a long time with just one renovation.”

“I want to keep costs down as much as possible.”

“I want to improve insulation because the indoors are hot.”

We will propose the best solutions from various plans based on your specific requests. Please note that there may be cases where we cannot start the work immediately due to the need for road use permits or occupancy permits before commencing construction.
In urgent cases like leak repairs, we may also be able to provide emergency measures without scaffolding, so please feel free to consult with us!

Summary

Above are the construction achievements for leak repairs in Aoba-ku, Yokohama.

Kakeru Koumuten Co., Ltd. offers free estimates and inspections!
If you have any concerns regarding roofs, rain gutters, exteriors, or exterior structures, please feel free to consult with us!

We are also happy to handle requests for solar panel removal and installation!

Kakeru Koumuten is an exterior renovation company that performs complete in-house construction from temporary scaffolding to roof work and exterior painting work.
We are confident that in terms of “cost, quality, and efficiency,” we do not fall behind compared to other companies!

We are confident in the costs associated with exterior renovations and the quality of our work, so
we welcome comparative estimates from other companies!
We also provide robust construction guarantees and aftercare services, receiving positive feedback for our appropriate proposals that align with our customers’ future life plans and desired price ranges!

We strive to ensure that everyone feels “I’m glad I asked them!” by sincerely addressing all requests.

We have also posted our pricing plans for roofing work and exterior painting below, 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!

We also welcome consultations via LINE◎

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