We have compiled a list of manufacturers, distributors, product information, reference prices, and rankings for Waterproofing work.
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Waterproofing work - Company Ranking(13 companyies in total)

Last Updated: Aggregation Period:Aug 13, 2025〜Sep 09, 2025
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Company Name Featured Products
Product Image, Product Name, Price Range overview Application/Performance example
<Details of Each Spray Material> ■SOSEI Foam A special polyurethane foam with adhesive and thermal insulation properties that cures instantly (insulating foam layer). ■SOSEI Coat A special polyurethane resin with high strength and waterproof properties that cures instantly (waterproof reinforcement layer). ■SOSEI Top A two-component polyurethane solvent with UV resistance (protective layer). *For more details, please download the PDF or feel free to contact us. <Uses> 【Measures for Roof Aging】 ■ Longevity Measures ■ Leak Prevention Measures ■ Insulation Measures ■ Earthquake Resistance (Reinforcement) Measures ■ Typhoon Measures ■ Asbestos Measures ■ Weight Reduction Measures ■ Soundproofing Measures ■ Condensation Measures *For more details, please download the PDF or feel free to contact us.
<Details on Safety and Environmental Performance> ■Waterproofing Seamlessly integrates the overlaps of the slate, hook bolts, and ventilation joints to achieve complete waterproofing. ■Fire Resistance (*Flame-Resistant Specification) In fire resistance tests, the ignition source naturally extinguished after 20 minutes. In the event of a fire, the roof will not spread flames. ■Durability In accelerated weather resistance tests using the "Xenon Lamp Method," there is no change even after 4000 hours (approximately equivalent to 10 years). ■Adhesion In adhesion confirmation tests, the tensile strength of slate aged 40 years significantly exceeds JIS standards. ■Impact Resistance In a 1kg steel ball drop test, there was no damage even after 50 drops, with a breaking load of 140 kgf, enhancing puncture resistance. ■Insulation The temperature in the attic before and after installation shows a reduction of over -10°C on extremely hot days (35°C) based on actual measurements. *For more details, please download the PDF or feel free to contact us. <Uses> 【Measures against Roof Aging】 ■ Longevity Measures ■ Leak Prevention Measures ■ Insulation Measures ■ Earthquake Resistance (Reinforcement) Measures ■ Typhoon Measures ■ Asbestos Measures ■ Weight Reduction Measures ■ Soundproofing Measures ■ Condensation Measures *For more details, please download the PDF or feel free to contact us.
【Features】 ■ Integrates the overlaps of slate, hook bolts, and joints of ventilation openings ■ Contributes to reducing the risk of roof and ceiling materials falling inside the building ■ Improves insulation, helping to control attic temperatures even on extremely hot days ■ Proven track record of 1 million m2 nationwide with major manufacturers and companies ■ Reliable leak compensation for up to 10 years (slate roofs) *You can view documents that include test data by downloading the PDF. Please feel free to contact us with any inquiries. <Uses> 【Measures for Roof Aging】 ■ Longevity Measures ■ Leak Prevention Measures ■ Insulation Measures ■ Earthquake Resistance (Reinforcement) Measures ■ Typhoon Measures ■ Asbestos Measures ■ Weight Reduction Measures ■ Soundproofing Measures ■ Condensation Measures *For more details, please download the PDF or feel free to contact us.
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  1. Featured Products
    "SOSEI Method" - System and Spraying Construction Procedure"SOSEI Method" - System and Spraying Construction Procedure
    overview
    <Details of Each Spray Material> ■SOSEI Foam A special polyurethane foam with adhesive and thermal insulation properties that cures instantly (insulating foam layer). ■SOSEI Coat A special polyurethane resin with high strength and waterproof properties that cures instantly (waterproof reinforcement layer). ■SOSEI Top A two-component polyurethane solvent with UV resistance (protective layer). *For more details, please download the PDF or feel free to contact us.
    Application/Performance example
    <Uses> 【Measures for Roof Aging】 ■ Longevity Measures ■ Leak Prevention Measures ■ Insulation Measures ■ Earthquake Resistance (Reinforcement) Measures ■ Typhoon Measures ■ Asbestos Measures ■ Weight Reduction Measures ■ Soundproofing Measures ■ Condensation Measures *For more details, please download the PDF or feel free to contact us.
    "SOSEI Method" - High Safety and Environmental Performance"SOSEI Method" - High Safety and Environmental Performance
    overview
    <Details on Safety and Environmental Performance> ■Waterproofing Seamlessly integrates the overlaps of the slate, hook bolts, and ventilation joints to achieve complete waterproofing. ■Fire Resistance (*Flame-Resistant Specification) In fire resistance tests, the ignition source naturally extinguished after 20 minutes. In the event of a fire, the roof will not spread flames. ■Durability In accelerated weather resistance tests using the "Xenon Lamp Method," there is no change even after 4000 hours (approximately equivalent to 10 years). ■Adhesion In adhesion confirmation tests, the tensile strength of slate aged 40 years significantly exceeds JIS standards. ■Impact Resistance In a 1kg steel ball drop test, there was no damage even after 50 drops, with a breaking load of 140 kgf, enhancing puncture resistance. ■Insulation The temperature in the attic before and after installation shows a reduction of over -10°C on extremely hot days (35°C) based on actual measurements. *For more details, please download the PDF or feel free to contact us.
    Application/Performance example
    <Uses> 【Measures against Roof Aging】 ■ Longevity Measures ■ Leak Prevention Measures ■ Insulation Measures ■ Earthquake Resistance (Reinforcement) Measures ■ Typhoon Measures ■ Asbestos Measures ■ Weight Reduction Measures ■ Soundproofing Measures ■ Condensation Measures *For more details, please download the PDF or feel free to contact us.
    Case Study 2 of Renovation of Slate Warehouse Roof Using SOSEI MethodCase Study 2 of Renovation of Slate Warehouse Roof Using SOSEI Method
    overview
    【Features】 ■ Integrates the overlaps of slate, hook bolts, and joints of ventilation openings ■ Contributes to reducing the risk of roof and ceiling materials falling inside the building ■ Improves insulation, helping to control attic temperatures even on extremely hot days ■ Proven track record of 1 million m2 nationwide with major manufacturers and companies ■ Reliable leak compensation for up to 10 years (slate roofs) *You can view documents that include test data by downloading the PDF. Please feel free to contact us with any inquiries.
    Application/Performance example
    <Uses> 【Measures for Roof Aging】 ■ Longevity Measures ■ Leak Prevention Measures ■ Insulation Measures ■ Earthquake Resistance (Reinforcement) Measures ■ Typhoon Measures ■ Asbestos Measures ■ Weight Reduction Measures ■ Soundproofing Measures ■ Condensation Measures *For more details, please download the PDF or feel free to contact us.