Hello!
I am Yamanaka from Kakeru Koumuten Co., Ltd., a specialist in roofing, exterior wall painting, and exterior renovations located in Aoba-ku, Yokohama!
This is a case study of roof repair (roof renovation) in Aoba-ku, Yokohama.
The work involved roof repair using the roof overlay (cover method) with Super Galtect.
Thank you very much for choosing Kakeru Koumuten Co., Ltd. among many contractors.
Construction Data for Aoba-ku, Yokohama
| Construction Location |
| Aoba-ku, Yokohama |
| Work Details |
| Temporary Scaffolding Installation Roof Overlay (Cover Method) |
| Inquiry Details |
| We received an inquiry from a customer living in Aoba-ku, Yokohama, stating, “Pieces of the roof are falling off, and we are experiencing leaks, so we are considering roof repairs.” The building is 21 years old, and the existing roofing material is “Zarufugurassa,” which is very brittle and not suitable for painting. The effective roof renovation method is the roof overlay (cover method), so we proposed this method. Since the customer requested “to make it last long with one renovation” and mentioned that “the second floor is hot,” we proposed the highly durable and insulated Super Galtect. |
| Existing Substrate / Materials Used |
|
Existing Roofing Material: Slate (Zarufugurassa) Roof overlay (cover method) materials used: Super Galtect |
| Price Range |
| 1,000,000 – 1,100,000 yen |
| Construction Period |
| 2 weeks |
| Completion Month |
| December 2021 |
Roof Overlay Construction Procedure
1. High-Pressure Washing
Before the roof overlay (cover method) construction, we performed high-pressure washing to clean the existing roof materials, as there was a significant amount of moss!
If there is a lot of moss, it can hinder the adhesion of the roofing sheet, so we wash it off!
2. Removal of Existing Ridge and Snow Guards
We will remove any components that may obstruct the cover construction.
・Snow stops (cut at the base)
・Ridge cap and purlin
・Ventilation ridge
We will dismantle and remove the above three items. The ventilation ridge is a component that allows hot air to escape from the attic.
The first photo shows the removal of the ridge cap, and the second photo shows the purlin inside the ridge cap!
The purlin was starting to show signs of corrosion in some areas.
Wooden purlins have a durability of about 10 to 15 years, so if they exceed their lifespan, they will start to corrode.
Corrosion of the purlin can lead to the ridge cap coming loose or leaks, so caution is necessary!
3. Installation of roofing sheet (waterproof sheet)
The roofing used is Tajima Roofing/Tadis Self Cover!
It is made of adhesive modified asphalt roofing, which is said to have three times the durability of regular asphalt roofing.
The durability is about 30 years, making it a highly durable roofing sheet.
As a primary waterproofing measure, if the roofing is solid, there will be no leaks!
We will ensure it is firmly adhered to prevent it from blowing away.
The existing roofing material this time is “Zarufu Glasa”, which is a non-asbestos roofing material that cannot be painted.
It is very brittle and classified as “fragile slate”, so when using the roof overlay method, the use of “Tadis Self Cover” is essential.
Tadis Self Cover is a roofing sheet specifically designed for the roof overlay method for fragile slate.
Since it has a durability close to that of the Super Galtect, it is a perfect match!
Kakeru Koumuten recommends using roofing sheets that have a durability close to that of the roofing material!
What is roofing for roof renovations? Introducing the important building material, roofing sheets!
4. Installation of integrated waste board under the ridge
First, we will install the base for the down ridge.
This is Kakeru Koumuten’s original ridge base, designed as an integrated waste board!
The waste board is a component that discharges rainwater to the outside in case rainwater seeps behind the roofing material!
Made of Galvalume steel, it is highly durable!
We will process and install it according to the dimensions of the roof!
5. Fabrication of Components (Karakusa, Keraba, Valley Metal)
Before the main roofing work, we will fabricate and install components such as keraba and karakusa!
The components used are genuine Galtect components made of SGL copper plate!
The keraba of the roof is a component that covers the edges and ends of the roof, guiding the flow of rainwater and ensuring waterproofing. It also serves as a decorative element that affects the building’s appearance.
The karakusa used is of the setback type for the overlay method!
When performing the roof overlay method, the height of the roof may become higher than the existing one, which can lead to issues with rainwater overflowing into the rain gutter!
By using the setback type karakusa, we can ensure that rainwater flows properly into the rain gutter!
6. Main Construction (Installation of Snow Stops and Nailing Strips)
After fabricating the components, we will install the Galtect main body up to the ridge! If there are skylights, we will also process flat metal around the skylights.
While installing the main body, we will also install the snow stops.
The snow stops are genuine Super Galtect products made of stainless steel!
Once the roofing is completed up to the ridge, we will install the nailing strip, which is necessary for securing the ridge metal. There are various types of nailing strips, including cedar, resin, and Galvalume copper plate, and this time we used Galvalume steel!
Galvalume steel is expected to have 3times the durability of cedar!
Not only is the durability high, but unlike resin or cedar, it does not crack, significantly improving wind resistance!
With a durability of over 30 years, it is well-matched with the durability of Super Galtect!
7. Processing of Ridge Metal and Wall-Edge Rain Guard Metal
Next, we will process and install the ridge cap. We will firmly apply sealing on the inside of the joints.
We will install a face plate on the inside of the ridge cap! By installing the face plate, we enhance waterproofing!
At the wall edge, we will process and install a component called a rain stop flashing.
The screws used for fixing are made of stainless steel with a packing that is resistant to rust!
Unlike nails, screws with packing are less likely to come loose and securely fix the ridge cap to the purlin!
Although it is not visible after construction, installing the face plate on the inside of the ridge cap increases waterproofing!
It firmly protects the ridge, which is a critical point of the roof.
8. Sealing Work at Various Locations
We will apply sealing to the ridge cap and the wall edges of the rain gutters.
After applying primer, we will perform sealing with Oton Exceed!
Oton Exceed has a durability of three times that of standard sealing materials, with a lifespan of approximately 30 years!
Since leaks can occur from the sealing and it can be difficult to notice deterioration on the roof, we use materials that match the durability of the roofing materials as much as possible!
9. Cleaning
We will clean up any debris that has fallen onto the balcony and rain gutters. We will thoroughly remove items like nails and metal scraps that could cause injuries. Additionally, we will wipe away any footprints left on the roof to ensure it looks clean.
We strive to make the area look better after the work than it did before!
That concludes the work!
Reasons Why Kakeru Koumuten is Chosen for Roof Repairs and Renovations in Aoba-ku, Yokohama
Regarding why our company is entrusted with roof renovations by customers in Aoba-ku,
one reason is that “Kakeru Koumuten’s headquarters is in Aoba-ku”, but
“Our unique approach to roof renovations that cannot be imitated by other companies”
“Roof repair plans that consider the characteristics and environment of Aoba-ku”
have received high praise from many customers.
Because we are confident, we welcome competitive estimates!
1.Facilities Specialized in Exterior Renovation
Kakeru Koumuten Co., Ltd. has prepared the following warehouses and material storage areas to provide more affordable and more reliable roofing and exterior renovations.
We have established 5 bases centered around Aoba-ku, Yokohama for material storage and showrooms.
In-house Scaffolding Materials
We own the scaffolding materials necessary for temporary scaffolding required for roof renovations, allowing us to assemble scaffolding in-house.
By conducting scaffolding work with our own scaffolding team instead of outsourcing, we can also cut costs on scaffolding construction expenses.
We have approximately enough scaffolding materials for 50 single-family homes!
Storage of Materials in Our Large In-house Warehouse
We store roofing materials and paints.
By ordering a large quantity of materials at once, we canprocure materials at a lower cost!
Additionally, we always have stock available, allowing us torespond quickly in emergencies!
In-house waste separation
In roof renovations, various waste materials such as paint, wood, and metal are generated.
Most contractors dispose of them all together, but by sorting and recycling the waste materials, significant cost reductions on waste disposal can be achieved.
We have also obtained permission for the collection and transportation of industrial waste.
Exterior Renovation Dedicated Showroom
In our showroom, not only can you have meetings, but you can also
directly check the actual roofing materials and colors.
You can also perform color simulations for exterior painting and check heat insulation properties using a heat insulation testing machine!
2.Complete In-House Construction
One of Kakeru Koumuten’s major strengths is our complete in-house construction.
From inquiry to project completion, everything is handled by Kakeru Koumuten Co., Ltd. in a consistent manner, allowing for high-quality roof renovations at reduced costs.
Additionally, one representative will assist you from the estimate to the completion of the work.
Since the same person will handle everything, including sales and construction management, smooth communication is ensured.
We are confident in our construction plans and costs, so we welcome competitive estimates!
3. Various Permits Obtained & Skilled Workers on Staff
We have obtained construction industry permits and permits for industrial waste collection and transportation!
We have certified professionals such as national licensed sheet metal workers and painting technicians, and we are confident in our construction techniques.
We are also capable of handling large-scale roofing projects for factories and other facilities!
We have qualified asbestos supervisors and asbestos surveyors on staff, allowing us to handle asbestos-containing roofing materials and conduct pre-investigations.
4. Warranty and Aftercare
Roof overlay and roof replacement work come with a guarantee!
Aftercare maintenance is available every year, and we send out notification DM each year.
If you are concerned about the guarantee, please click on the image above!
5. Flexible and Prompt Response
Our company is equipped to handle various roofing troubles and situations.
Even if you cannot access the roof at high places, we can respond using a drone!
During leak investigations, we can also conduct surveys using a thermal imaging camera.
We will respond according to your wishes.
We also accept emergency measures for sudden leaks from the roof!
6. Human Resource Development
We create various roof models by ourselves for skill enhancement and conduct practical training.
Since roof renovations require various modifications depending on the site, we regularly provide technical training to ensure that each staff member can respond effectively.
7. Roofs with installed solar panels can also be renovated!
Our company is capable of handling renovations for roofs that already have solar panels installed.
We can also manage the removal and disposal of solar panels associated with roof renovations, and we are able to take requests for solar panel removal only.
Roof renovations are possible without removing solar panels!
By using the roofing material called “Sea Guard,” it is possible to carry out roofing work without removing solar panels!
However, unlike regular roof overlay (cover method) work, there is no installation of waterproof sheets, and the roofing material is fixed only with adhesive, making it a temporary roofing solution aimed at cost reduction without a budget.
8. Detailed estimates and easy-to-understand materials!
At our company, to help customers considering roofing work make clearer comparisons, we provide not only detailed estimates but also “reports,” “guides,” and “comparison tables for new roofing materials” along with the estimates.
The comparison tables are categorized by the rank of roofing materials, allowing for easy comparison of total costs and durability at a glance!
About Super Galtect (Roofing Material)
The roofing material used is the Super Galtect from Aji Industry Co., Ltd.
The Super Galtect comes with a 15-year paint warranty and a 25-year hole warranty from the manufacturer.
We also provide a 10-year workmanship warranty!
Made of Galvalume steel, it is resistant to rust.
Insulation material is tightly applied from edge to edge of the roofing material, creating a metal sheet that integrates the steel plate and insulation.
When installed, insulation is applied even to the parts where the roofing materials overlap, and the surface is coated with a highly heat-reflective paint, allowing for cool summers and warm winters.
Additionally, it has soundproofing properties, reducing the sound of rain.
Being lighter than other roofing materials, it also minimizes the sway during earthquakes, providing earthquake resistance!
Finish, durability, insulation, soundproofing, and wind resistance are all excellent, and among our construction achievements, the Super Galtect from Aji Industry Co., Ltd. is the most popular and highly regarded!
Colors
■ Shade Black
■ Shade Brown
■ Shade Blue
■ Shade Moss Green
■ Shade Charcoal
You can choose from these 5 colors!
This time, the cover work in Shade Black turned out exceptionally well!
Thank you for your request!!
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.
As the name suggests, it is 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 “layered roofing.”
Benefits 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 generated.
This is its most significant feature, leading to various advantages.
The only parts that require demolition and waste disposal are typically 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).
Some building materials used in constructions prior to 2004 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 overlay 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?” 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 time frame compared to painting or complete roof 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 set up, 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, and the roof overlay method is the most frequently performed service we offer. We are very grateful that we have been continuously engaged in roof overlay projects without interruption.
Process of Roof Repair and Roofing Work at Kakeru Koumuten
1. Inquiry and Consultation
First, please let us know the condition of your roof via phone or email!
2. On-Site Inspection and Estimate
We will arrange a date and time for the on-site inspection based on your preferences and visit your home.
We will check the shape, material, and installation conditions of the roof and building.
After that, we will prepare an estimate that includes the necessary work and costs, and provide it to you!
3. Decision on Leak Repair and Roofing Work
Based on the inspection results and estimate, we will ask for your decision.
Rest assured, we will not pressure you into proceeding with the work.
You are welcome to compare our estimate with others before making your decision!
4. Contract and Schedule Confirmation
Once you have thoroughly reviewed the estimate and decided to proceed with Kakeru Koumuten, we will have you fill out the contract (by mail or in person) and discuss your availability to set the construction schedule.
5. Start of Construction
Experienced workers will carry out the construction responsibly! Depending on the nature of the work and weather conditions, the planned construction period may shift or extend.
In such cases, we strive to conduct the work with consideration for minimizing inconvenience to you and your neighbors.
6. Completion of Construction (Inspection and Photo Review Before Handover)
We will explain the repair items and review the photos of the completed roof with you before handing it over.
If you have any concerns at that time, please feel free to let us know!
7. Payment
Voices of Customers Who Have Actually Had Work Done
Possible Subsidies and Grants for Roof Renovation in Aoba-ku, Yokohama
In Aoba-ku, Yokohama, there are potential subsidies available for leak repairs and roof repairs.
For details, please contact our company or your local government.
This program aims to create a safe city resilient to earthquakes. The city of Yokohama conducts “seismic diagnosis” for wooden private houses, dispatching “certified seismic diagnosis specialists” recognized by the mayor to conduct surveys for citizens wishing to have a seismic diagnosis, thereby supporting their seismic measures.
https://www.city.yokohama.lg.jp/business/bunyabetsu/kenchiku/bosai/taishin/hojokinshienseido/mokutai/taishin/mokushindan.html
The Yokohama City Wooden House Seismic Renovation Promotion Project is a system where the city subsidizes part of the costs for seismic renovation work on wooden private houses.
About the Earthquake Resistance Renovation Subsidy System for Wooden Houses in Yokohama City
https://www.city.yokohama.lg.jp/business/bunyabetsu/kenchiku/bosai/taishin/hojokinshienseido/mokutai/mokukaishu/mokukaishu.html
Trust Kakeru Koumuten for Roof Renovations in Aoba-ku, Yokohama!
Our company is based in Aoba-ku, so we have extensive experience in roof repairs and renovations in the area.
We are happy to assist with partial roof repairs, including roof overlay work, roof replacement, and leak repairs.
“I just want to know the estimate for a roof renovation,” “I want to know about roofing materials,” and any other questions or concerns you may have, please feel free to contact us!
Community-Focused Service
As a local exterior renovation company in Aoba-ku, Yokohama, we handle many roof renovations and leak repairs! Whether you want a renovation that lasts a long time, want to keep costs down, or need to improve insulation because your indoor space is hot, we provide optimal solutions for your specific needs.
Long-Term Reliability
All roofing materials we use come from reliable manufacturers that offer long-term warranties. For example, the Super Galtect we are using this time comes with a 15-year coating warranty and a 25-year hole warranty. We also provide a 15-year construction warranty! You can use it with peace of mind for a long time after just one renovation.
Additionally, we can visit for aftercare maintenance every year!
We send out aftercare maintenance DM every year!
List of Areas in Aoba-ku, Yokohama
Aoba-dai, Aoba-kuAkane-dai, Aoba-kuAzamino, Aoba-kuAzamino Minami, Aoba-kuIchigaocho, Aoba-kuUtsukushigaoka, Aoba-kuUtsukushigaoka Nishi, Aoba-kuUmegaka, Aoba-kuEnkodata, Aoba-kuEda Kita, Aoba-kuEda Cho, Aoba-kuEda Nishi, Aoba-kuEnokioka, Aoba-kuOba Cho, Aoba-kuOnda Cho, Aoba-kuKakinokidai, Aoba-kuKatsuradai, Aoba-kuKamiyamamotocho, Aoba-kuKamoshida Cho, Aoba-kuTetsumachi, Aoba-kuKurosuda, Aoba-kuSakuradai, Aoba-kuSatsukigaoka, Aoba-kuShimoyamamotocho, Aoba-kuShiratoride, Aoba-kuShin Ishikawa, Aoba-kuJikecho / Aoba-kuSusukino / Aoba-kuSumiyoshidai / Aoba-kuTachibanadai / Aoba-kuTana-cho / Aoba-kuChigusa-dai / Aoba-kuTsutsujigaoka / Aoba-kuNara / Aoba-kuNara-machi / Aoba-kuNariai-cho / Aoba-kuFujigaoka / Aoba-kuMatsukaze-dai / Aoba-kuMisuzugaoka / Aoba-kuMitakidai / Aoba-kuMidoriyama / Aoba-kuMoegino / Aoba-kuMotoishikawa-cho / Aoba-kuMominokidai / Aoba-kuWakakusa-dai
Summary
Above are the construction achievements for roof repairs in Aoba-ku!
There are many roofing materials for slate roofs that cannot be painted, and if you proceed with roof painting, the construction costs may become wasted.
Additionally, when using the roof overlay (cover method), be sure to check not only the main roofing material but also the auxiliary materials such as “ridge base,” “roofing sheet,” and “sealing materials”!
For more details on roofing materials that cannot be painted, click here!
With this roof repair, the leak has been successfully stopped!
Estimates and inspections are, of course, free! If you have any concerns regarding roofs, rain gutters, exterior walls, or exterior structures, please consult Kakeru Koumuten Co., Ltd. in Aoba-ku, Yokohama!
Kakeru Koumuten is a remodeling company strong in exterior renovations, and we conduct complete in-house construction from temporary scaffolding to roof work and exterior wall painting.
Regarding exterior renovation work, we are confident that we do not fall short compared to other companies in terms of “cost, quality, and good planning”!
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 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, leak repair 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!
・Aoba-ku, Yokohama | We performed roof overlay work using Super Galtect!
・Aoba-ku, Yokohama | Roof remodeling | We performed overlay work using Super Galtect!
・Aoba-ku, Yokohama | We performed overlay work using Urbanie – Super Galtect!
・Aoba-ku, Yokohama |We will explain the importance of obtaining multiple estimates for roof remodeling and points to compare!
・About the costs of roof overlay work | Kakeru Koumuten’s roof construction plans
・We will introduce construction methods according to the type of roof construction and the degradation situation!
・Painting DIY plan! A must-see for those who want to try DIY roof and exterior wall painting! We will only set up the scaffolding!
・About the costs of exterior wall painting | Kakeru Koumuten’s exterior wall painting plans!
・About the costs of leak repairs | Kakeru Koumuten’s leak repair plans!
・Roof Ridge Cap Replacement | Cost of Surface Plaster | Kakeru Koumuten’s Construction Plan!
・Latest Edition | Grants, Subsidies, and Reduction Systems Available for Renovations!
・Renovation Store in Yokohama, Kanagawa | What is Roof Overlay (Roof Cover Method)?
Features of Aoba-ku, Yokohama
Aoba-ku, Yokohama is an area that combines nature with convenient urban functions!
Located in the northwestern part of Yokohama City, it covers an area of approximately 35 km2, making Aoba-ku the second largest ward in Yokohama City after Totsuka-ku.
It has excellent transportation access, being within a 30-minute train ride to Shibuya Station, and is home to many commuters and students.
Additionally, it features quiet residential areas, many hills, and a rich green landscape along the Tsurumi River that flows through the central part of the ward.
Since residential areas are primarily developed in hilly terrain, there tends to be many slopes, but there are plenty of relaxing spots. Notably, attractions like “Kodomo no Kuni,” which utilize Aoba-ku’s vast natural surroundings, provide appealing natural playgrounds for families and child-rearing generations.
Roof Renovation and Repair Service Areas
Kakeru Koumuten is based in Aoba-ku, Yokohama, allowing us to provide roof repair and renovation services throughout the entire area of Aoba-ku, Yokohama.
List of Areas in Aoba-ku, Yokohama
Aoba-ku Aobadai / Aoba-ku Akane-dai / Aoba-ku Azamino / Aoba-ku Azamino Minami / Aoba-ku Ichigao-cho / Aoba-ku Utsukushigaoka / Aoba-ku Utsukushigaoka Nishi / Aoba-ku Umegaoka / Aoba-ku Egotan / Aoba-ku Eda Kita / Aoba-ku Eda-cho / Aoba-ku Eda Nishi / Aoba-ku Enokioka / Aoba-ku Oba-cho / Aoba-ku Onda-cho / Aoba-ku Kakinokidai / Aoba-ku Katsuradai / Aoba-ku Kamitayamoto-cho / Aoba-ku Kamoshida-cho / Aoba-ku Tetsumachi / Aoba-ku Kurosuda / Aoba-ku Sakuradai / Aoba-ku Satsukigaoka / Aoba-ku Jike-cho / Aoba-ku Shimotayamoto-cho / Aoba-ku Shiratoridai / Aoba-ku Shin-Ishikawa / Aoba-ku Susukino / Aoba-ku Sumiyoshidai / Aoba-ku Tachibanadai / Aoba-ku Tana-cho / Aoba-ku Chigusa-dai / Aoba-ku Tsutsuji-ga-oka / Aoba-ku Nara-cho / Aoba-ku Nariai-cho / Aoba-ku Fujigaoka / Aoba-ku Matsukaze-dai / Aoba-ku Mitakedai / Aoba-ku Midoriyama / Aoba-ku Moegino / Aoba-ku Moto-Ishikawa-cho / Aoba-ku Momino-ki-dai / Aoba-ku Wakakusa-dai / Aoba-ku Misuzugaoka / Aoba-ku Nara
LINE consultations are also very welcome◎
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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!
