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 Mitaka City, Tokyo.
The current exterior renovation involves a roof overlay (cover method) construction (Type 32 Standing Seam)!

The existing roofing material is a discontinued tile U that is no longer in production.
Tile U may contain harmful substances, including asbestos, in some cases.
The tile U used in this project contains asbestos.

On this page, we will explain the actual results of the work performed by Kakeru Koumuten!

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

Roof Overlay Construction Data in Mitaka City, Tokyo

Construction Location
　Mitaka City, Tokyo
Construction details
Temporary scaffolding installation　Roof Replacement
Process Leading to Construction

We received the following inquiry from a customer living in Mitaka City, Tokyo.
"I am getting estimates from several companies because I have a leak. I have been advised that a roof replacement is the only option, but it is expensive, so I would like to request a comparative estimate."

・Proposal Details
The existing roofing material was asbestos-containing tile U. Tile U is now discontinued, and partial replacement is not possible.
The condition of the roof is generally very cracked, and as per other companies' assessments, the only way to stop the leak is through a roof replacement.
We provided temporary measures for the leak so that the customer could take their time to consider.
Since there is a gentle slope, we proposed a vertical roofing material suitable for gentle slopes, the Tachi Hirabiki Lock!

Since it was significantly cheaper than other companies, the customer entrusted the work to us!
As the final cost was lower than initially expected, the customer upgraded to roofing material with insulation and entrusted the work to us!
New Materials Used

New Roofing Material:Sekino Kousan/Tachi Hirabiki Lock Type 32, Flat Type, with Insulation
Roofing: Tajima Roofing/Tadis Self　
Rafter base: Galvalume steel　
Roofing material fasteners: Stainless screws
Price Range
1,900,000–2,000,000 yen (including temporary scaffolding construction costs)
Construction Period
　7 days
Completion month
　2024-10

Roof Replacement Construction Photos

1. Existing Roofing Material Dismantling

We will dismantle and remove the existing roofing material. ※Confirmation⇨ Since the tiles contain asbestos, we will double package them to prevent scattering before transporting them to the final disposal site in Chiba Prefecture.

2. New Sheathing Installation


After dismantling the existing roofing material, we will process and install new sheathing (structural plywood) to fit the dimensions![/chat]

3. Installing Roofing (Waterproof Sheet)

We will install the roofing sheet (waterproof sheet) on top of the substrate!The roofing used is Tajima Roofing/Tadi Self!
It is made of a delayed adhesive modified asphalt roofing material, 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 secure it firmly to prevent it from blowing away. [/chat]

4. Fabricating Accessories

Before the main roofing work, we will process and install accessories such as arabesques!
The material used for the accessories is galvalume steel sheet.

[/chat]

4. Main Construction (Sekino Kousan/Ritohira Lock Type 32)

After processing the

accessories, we will install the main body of the 32-type Tachi-Hira Lock! At the wall edges and ridge lines, we will raise the main body of the 32-type Tachi-Hira Lock to enhance waterproofing. While Tachi-Hira Lock has low thermal insulation and soundproofing properties, this time we used a version with insulation material!
For the purlin (ridge base), there are three types: cedar, resin, and Galvalume steel, and this time we used the Galvalume steel version!
The Galvalume steel version is expected to have three times the durability compared to cedar! Unlike resin and cedar, it does not crack, providing peace of mind!

Our original integrated waste board made of Galvalume steel for the ridge base 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, thus demonstrating high waterproofing!

5. Rain Stop Processing

At the wall edges, we will process and install a component called rain stop sheet metal.
The nails and screws used for fixation are made of stainless steel, which is resistant to rust!

Packaged screws are less likely to come out compared to nails, securely fixing the ridge sheet metal to the purlin!

Although it is not visible after construction, installing a face plate on the inside of the ridge sheet metal enhances waterproofing!
It firmly protects the ridge, which is a critical point of the roof.

6. Cleaning

During and after the construction, we will clean the roof, as well as any debris that has fallen onto the balcony or rain gutters. We will thoroughly remove any nails or metal scraps that could cause injury. Additionally, we will wipe away any footprints left on the roof to keep it clean.

Roof Materials Used

The roof material used is Sekino Kousan’s Tachihei Lock 32 type.

For roof replacement and overlay, we provide a 10-year construction warranty!
If there are any leaks within 10 years, we will repair them free of charge.
It is made of Galvalume steel, which is resistant to rust.
We pursue the basic functions of the roof, such as water drainage and strength, and by applying ripples and ribs to the surface of the roofing material, we enhance the strength of the roof surface and prevent the phenomenon of board noise.

For roofs with a slope of 2.5 shaku or less, please be sure to choose a vertical roof like the Tachihei Lock 32 type! Horizontal roofs like Colonial or Galtect are not allowed for construction!

Moreover, since it is a molded integrated type of Tachihei roofing that does not require hanging pieces or fastening, it is constructed with a single long sheet of metal (long metal sheet) from the peak of the roof to the eaves, which means there are no horizontal seams in between, minimizing the risk of leaks by eliminating opportunities for rainwater to flow into the roofing material. It is recommended for houses with a gentle roof slope (angle).
Additionally, it is the lightest among metal roofs, and by reducing the weight of the roof, it is possible to make your house more earthquake-resistant through roof replacement.

Color

This time, we completed the roof work in durable dark brown, and it turned out very well!
The customer was extremely satisfied, and I was very happy as well!
Thank you very much!

Please check out other roofing work achievements here!

For roof renovations in Mitaka City, Tokyo, trust Kakeru Koumuten!

Our company is based in Yokohama, but we also have extensive experience in roof renovations in Mitaka City, Tokyo.
We are happy to assist with partial roof repairs, including roof cover work, roof replacement, and leak repairs.
If you have any questions or concerns, such as “I just want to know the estimate for roof renovation” or “I want to know about roofing materials,” please feel free to contact us!

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 also offer comprehensive construction guarantees and aftercare maintenance, and we have received positive feedback for our cost performance and appropriate proposals that align with 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 are interested!

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

Helpful information about exterior renovations can be found here!

If you don't mind, please take a look at this as well!

・[Mitaka City, Tokyo]｜We carried out a roof replacement from tiles to Super Galtects!
・[Mitaka City, Tokyo] Exterior wall, roof, and exterior painting｜We performed exterior renovations through painting work!
・[Nishi-Tokyo City, Tokyo]｜Roof Renovation｜We performed roof overlay (cover method)!
・Painting DIY Plan! For those who want to try DIY roof and exterior wall painting! We will only set up the scaffolding!
・About the cost of roof overlay｜Kakeru Koumuten’s roof construction plan!
・About the cost of exterior wall painting｜Kakeru Koumuten’s exterior wall painting plan!
・About the cost of leak repairs｜Kakeru Koumuten’s leak repair plan!
・Exterior wall cleaning construction plan without the need for temporary scaffolding installation!
・Latest｜About subsidies and grants available for renovations, and reduction systems!
・What is Kasagi? We will explain the role and repair methods of kasagi in detail!
・Renovation store in Kanagawa Prefecture, Yokohama | What is roof overlay (roof cover method)?

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For roof, gutter and exterior construction and repairs in Kanagawa,
contact Kakeru Koumuten Co., Ltd.

Kakeru Koumuten is a young company whose team is, on average, in their late twenties, but our skills are second to none.

Our greatest strength is that we handle scaffolding, roofing and painting entirely in-house. In an industry where these tasks are usually divided among contractors, our complete service simplifies project management and helps keep costs down. Above all, if a problem arises, we respond promptly.

We proudly describe ourselves as the youngest and most helpful renovation company in Kanagawa!

 

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