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Why is waterproofing necessary?

Is waterproofing really necessary? A detailed explanation of how waterproofing works!

We would like to introduce the modified asphalt waterproof sheet "OS-sheets" handled by Robusto. Waterproofing, in essence, is a mechanism to prevent water from entering the structure of a building in order to protect it from rain leaks and deterioration. For example, in the case of concrete buildings, over time, due to the degradation and behavior of the building, cracks may develop in the concrete. If rainwater enters through these cracks, it can permeate, causing leaks and leading to the corrosion of the rebar within the concrete. Waterproofing protects buildings from water and helps them last longer. *For more details, please refer to the PDF materials or feel free to contact us.

  • Waterproof sheet
  • Special Construction Method
  • Renovation and repair methods

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What types of waterproofing are there?

Speed up! Cost down! Two processes reduced to one.

Introducing the modified asphalt waterproof sheet "OS-sheets" handled by Robusto. There are various types of waterproofing, including the "coating method," which can accommodate complex shapes, the "sheet method," which creates a uniform thickness of the waterproof layer, and the "coating + sheet method," which produces a thick waterproof layer with high waterproofing properties. Traditionally, two processes were required: a ventilation layer and a waterproof layer to allow moisture to escape. With "OS-sheets," it is possible to consolidate these processes. Two processes are reduced to one. 【Types of Waterproofing】 ■ Coating method (membrane waterproofing) ■ Sheet method (sheet waterproofing) ■ Coating + sheet method (asphalt waterproofing thermal method) *For more details, please refer to the PDF materials or feel free to contact us.

  • Waterproof sheet
  • Special Construction Method
  • Renovation and repair methods

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Features of OS-sheets

The conventional layering process has been shortened to one step! Sandwich structure of modified asphalt layer.

"OS-sheets" are single-layer sheets that enable the functions of the traditional two-layer system: a "bottom" ventilation layer and a "top" waterproof layer. As a result, the conventional lamination process has been shortened to one step, allowing for a reduced construction period. 【Features】 ■ Sand granules: Protect the waterproof layer and prevent UV degradation ■ Modified asphalt: Asphalt with additives such as rubber and plastic ■ Synthetic fiber non-woven fabric: Improves dimensional stability and tensile strength ■ Partially adhesive self-adhesive layer: Maintains breathability while also excelling in insulation *For more details, please refer to the PDF document or feel free to contact us.

  • Waterproof sheet

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Waterproof construction method "OS-sheets Waterproof System" to improve productivity.

Realizing labor-saving and productivity improvement in construction! An environmentally friendly waterproofing construction system.

The "OS-sheets Waterproofing System" is a waterproofing construction system provided using waterproof materials (OS-sheets & O-PHALT) and tools (OS hand burner). It possesses the necessary functions and performance to guarantee a waterproof layer for 10 years and can accommodate various shapes and substrates. It is easy to use, highly productive, reduces waterproofing costs, and minimizes environmental impact. 【Features】 ■ While being a single-layer sheet, it has the functionality of two layers: a ventilation layer (under layer) and a waterproof layer (top layer), allowing for process elimination and shortening of construction time. ■ Combines the ease of installation of self-adhesive methods with the watertightness of torch methods. ■ Simply melt and bond the joints and edges of the sheet with a torch burner. ■ CO2 emissions can be reduced to below 10% compared to sheets that are heated over the entire surface. *For more details, please refer to the PDF document or feel free to contact us.

  • Waterproof sheet

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OS-sheets Ventilation System with Continuous Air Release Path from the Ventilation Layer

Achieving labor-saving and productivity improvement in construction! Environmentally friendly waterproofing construction system *Patent obtained! Patent No. 7001280

The "OS-sheets Deaeration System" is a deaeration tube that ensures a continuous deaeration path from the ventilation layer. It has been developed as a deaeration tube that further enhances the benefits of OS-sheets. *Patent obtained! Patent No. 7001280 ★What are OS-sheets? "OS-sheets" are single-layer sheets that have two essential functions (breathability and waterproofing) for waterproof sheets. They are single-layer modified asphalt waterproof sheets that conform to JIS A 6013, possessing the same functions as two-layer sheets while allowing for reductions in materials, processes, and labor, as well as shortening construction periods. *For more details, please refer to the PDF materials or feel free to contact us. *The effectiveness is demonstrated when used with "OS-sheets"! For more information, please check below: 【【Addressing Labor Shortages】10-Year Warranty (extendable) Modified Asphalt Waterproof Sheet 'OS-sheets'】.

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  • Waterproof sheet
  • Waterproofing work

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No qualifications needed! Anyone can easily perform waterproofing work with the 'Waterproofing System'.

Roof waterproofing work that fulfills all: shortening construction time, reducing construction costs, improving productivity, and solving labor shortages. We provide everything necessary for waterproofing work. *Materials available upon request.

Due to the peak in the number of households and the acceleration of an aging society, Japan will face a future where, even if construction occurs, there will be a shortage of both "money" and "people" to carry out the work. In response, we propose the OS-sheets waterproofing system for rooftop waterproofing projects. "OS-sheets" integrates the two-layer sheet lamination process of the conventional on-site underlay (ventilation sheet) and overlay (waterproof sheet) in a factory (labor-saving). By omitting processes at the construction site, we can reduce the number of workers needed, making it possible to carry out more construction projects. 【Challenges】 ■ Peak in the number of households → Shortage of construction funds - Increase in vacancies in apartment buildings - Decrease in repair funds such as reserve funds ■ Acceleration of an aging society → Decline in construction productivity - Significant decrease in the working-age population (ages 15 to 64) - Chronic labor shortages - Shortage of skilled workers *For more details, please refer to the PDF document or feel free to contact us.

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  • Waterproof sheet

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Modified asphalt waterproof sheet "OS-sheets"

Stop rainwater with the self-adhesive seal part! Waterproof sheet with joint watertightness.

"OS-sheets" are environmentally friendly, economically effective, and feature excellent durability of modified asphalt and watertight joints, while also possessing compatibility with the substrate and breathability as a waterproof single-layer sheet. By shortening the process, it leads to reduced construction time and costs. At the time of sheet installation, the self-adhesive seal at the joint blocks the intrusion of rainwater! You can rest assured even during sudden rain. Furthermore, only the sheet joint area is heated, allowing for large-scale installation using just a hand torch burner. Additionally, we offer a one-component modified asphalt-based coating waterproofing material called "O-PHALT." 【Features】 ■ Sandwich structure of modified asphalt layer ■ Minimizes the use of open flames ■ Safe design that seals during sheet installation ■ Equipped with temporary waterproofing function *For more details, please refer to the PDF document or feel free to contact us.

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  • Waterproof sheet

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"OS-sheets" has been registered in "NTEIS"!

The advancement of the "hybrid type modified asphalt sheet construction method" has been recognized.

The hybrid modified asphalt sheet construction method we handle, 'OS-sheets,' has been recognized for its advancement and registered as a new technology in NETIS on November 30, 2020. The main points registered in NETIS include "shortened construction period," "no need for skilled labor required for torch bonding," and "increased construction speed." This method using our product brings revolutionary changes to the processes outlined in the public building construction standard specifications for "Roof Exposed Waterproof Insulation Construction ASI-T1" and "Roof Exposed Waterproof Insulation Construction AS-T3." [Benefits of Using NETIS Registered Technology] ■ Using new technology (NETIS) in construction → Possible to shorten construction period and reduce costs ■ Using new technology (NETIS) in public works, etc. → Points added in comprehensive evaluation method ■ Proposals for utilizing new technology from contractors → Eligible for additional points in construction performance evaluation *For more details, please refer to the PDF materials or feel free to contact us.

  • Waterproof sheet
  • Waterproofing work

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【Labor Shortage Resolution】10-Year Warranty (with Extension) Modified Asphalt Waterproof Sheet

Since only the joints of the waterproof sheet are melted for joining, anyone can easily install it! Using a small burner, there is no need for gas refilling. *Shortens construction time and reduces costs.

The modified asphalt waterproof sheet "OS-sheets" is a modified asphalt sheet using a cold self-adhesive method, which excels in adhesion to the substrate and breathability. The joints and edges of the sheet are fused using a torch burner. It is a hybrid type modified asphalt sheet that combines the advantages of the self-adhesive method and the waterproofing of the torch method, reducing the heat generation during installation to below 10% compared to conventional torch methods. It is also environmentally friendly and offers economic benefits. 【Features】 ■ Hybrid sheet combining the advantages of cold self-adhesive and torch methods ■ Excellent adhesion to the substrate and breathability ■ Reduces heat generation to about 10% ■ Environmentally friendly and labor-saving ■ Shortens construction period ■ Addresses labor shortages ■ Economic benefits 【Specifications】 Modified asphalt sheet (synthetic fiber non-woven fabric + modified asphalt) 1.0m × 8.0m, thickness 4.0mm, surface with sand granules, back with partial adhesive layer 【Other Features】 ■ The partial adhesive layer on the back allows for adhesion to the substrate, providing both breathability and waterproof performance with a single sheet. ■ The sheet joints are fused through heating with a torch burner, ensuring complete integration and waterproofing. ■ Installation is possible even over large areas using only a handheld torch burner.

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  • Waterproof sheet
  • Special Construction Method
  • Renovation and repair methods

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OS-sheets: Customer Feedback

Here are some comments from our customers who manage apartments!

We received valuable feedback from a customer who manages a condominium where Robusto's modified asphalt waterproofing sheets "OS-sheets" have been introduced. 【Customer Feedback】 While searching for a company to carry out waterproofing work, I happened to find Robusto's website and made an inquiry. I contacted them by phone, and the representative was very kind and left a good impression. They also quickly sent me the estimate. The construction was done carefully, and I am really glad I made the request. *For more details, please refer to the PDF document or feel free to contact us.

  • Waterproof sheet

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Increase productivity in rooftop waterproofing work! For that, use the "OS-sheets Waterproofing System."

"Shortened construction period and increased productivity!" With a reassuring 10-year warranty. By shortening the construction period, we reduce construction costs and lessen the burden on residents!

In Japan, where population decline and a decrease in the number of households are progressing, buildings with an increasing trend of vacant rooms are becoming more common. Furthermore, due to the impact of the COVID-19 pandemic, there have been reductions in rent, unpaid rents, and evictions. In a situation where there are few tenants due to the COVID-19 shock, it is anticipated that there may be a shortage of repair reserve funds and repair costs, which could prevent necessary waterproofing work from being carried out, or lead to expenses for other priorities. Nevertheless, maintenance and quality management of the building cannot be overlooked. To break such a situation, our company proposes the "OS-sheets Waterproofing System." The "OS-sheets Waterproofing System" reduces the financial burden on building and condominium owners and shortens construction periods, thereby reducing the burden on tenants. Additionally, it is a reliable waterproofing system with a 10-year warranty. **Benefits of the OS-sheets Waterproofing System** - Reduces construction costs - Shortens construction periods to lessen the burden on tenants - Reliable 10-year warranty *For more details, please refer to the PDF document or feel free to contact us.*

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  • Waterproof sheet

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"Hybrid Type Modified Asphalt Sheet Construction Method" *NETIS Registered

It will bring transformation to the processes of the "exposed roof waterproofing insulation construction method" and "exposed roof waterproofing insulation method" in the standard specifications for public building construction!

The hybrid modified asphalt sheet construction method "OS-sheets," which our company handles, has been recognized for its advancement and registered as a new technology in NETIS on November 30, 2020 (NETIS number: KT-200118-VR). The main contents registered in NETIS are: 1. Shortened construction period 2. Quality assurance 3. Reduced burden on workers and the natural environment 4. Cost reduction This construction method using our product will bring revolutionary changes to the processes outlined in the public building construction standard specifications for "Roof Exposed Waterproof Insulation Method ASI-T1" and "Roof Exposed Waterproof Insulation Method AS-T3." 【What’s amazing about the OS-sheets Waterproof System】 ■ Reduced installation steps due to the single-layer sheet → Reduced work burden, shortened construction period, and cost reduction ■ Torch bonding only at the joints significantly reduces the workload to about 1/10 of conventional techniques → Increased construction speed ■ Easy confirmation of torch melting results → No need for the skill required for torch bonding ■ Using the OS hand burner for torching the joints of "OS-sheets" → Reduced risk of burns and fires for workers / Reduced workload for handling gas burners *For more details, please refer to the PDF materials.

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  • Waterproof sheet
  • Waterproofing work

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As a result of simplifying materials and processes... shortened construction period! Reduced waterproofing costs!

Easy construction ensures quality while shortening construction time, reducing costs, and increasing profits! The advancements in workability, environmental performance, and economic efficiency have been recognized, and it has been registered in NETIS.

In the typical modified asphalt waterproofing torch method, the process begins with the installation of a ventilation sheet, followed by the application of a sand-coated sheet, where the entire back surface is heated and melted using a torch burner. This process requires a high level of skill and places a significant burden on the workers. OS-sheets have mechanized the entire torch sheet heating process at the construction site in a factory setting, which has improved quality and reduced the burden on workers, while also eliminating one step in the construction process. The torch work at the construction site is now limited to the sheet joint areas, allowing for approximately a 90% reduction in the use of open flames compared to the typical modified asphalt waterproofing torch method, significantly lowering CO2 emissions and the burden on workers. As a result, the speed of waterproofing construction has increased, and stable quality improvements have been achieved while considering the natural and working environments. OS-sheets enhance productivity with a smaller workforce, shorten construction periods, and enable more waterproofing projects to be completed. Additionally, the OS-sheets waterproofing system has a simple material composition, making inventory management easier and reducing transportation costs. By simplifying materials and processes, various costs can be reduced, allowing for the generation of additional profits.

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  • Waterproof sheet

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Waterproof sheet with a safe design that is sealed during sheet installation.

You can achieve temporary waterproofing with a protective seal (self-adhesive seal), so you can feel secure even in sudden rain! It guards against not only rainwater but also the intrusion of flames.

The OS-sheets are 1 meter wide and 7 meters long, with a 10 cm wide joint section on the long edge (side lap). Of that, 1 cm is a protective seal (self-adhesive seal section), and the remaining 9 cm is welded using a torch. During the sheet installation, it features a temporary waterproof function sealed by the 1 cm self-adhesive section, allowing the installation work and torch work to be performed separately, enabling the torch work on the side lap to be carried over to the next day. Even in the event of sudden rain, you can work with peace of mind thanks to the temporary waterproof function. Additionally, during the torch work at the sheet joint, the protective seal prevents flames from entering the sheet interior, allowing for safe installation without worrying about the substrate. *Please check the actual waterproof performance in the video on this site.

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  • Waterproof sheet

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