FAQS

Yes. Sika polyurethane sealant and Dow Corning (now Dowsil) structural silicone sealant are both part of our standard inventory, with a full range of specifications available (300ml cartridges and 600ml soft packs).

① Response within 48 hours ② Provision of a problem analysis report (distinguishing between product, construction, and design causes) “Customer first, service foremost” is Junqin’s service philosophy.

Yes. All partner-brand products come with original factory test reports (COA), and we can also issue, upon customer request: ① fire-resistance testing ② wind‑load resistance testing ③ corrosion‑resistance testing ④ ROHS/REACH environmental certifications. For large projects, third-party retesting by SGS or CTI is available.

Three-step quotation process: ① The customer provides drawings or technical specifications (roof area, purlin spacing, wind resistance grade, insulation requirements, etc.); ② We issue a BOM list and quotation within 24 hours; ③ After both parties confirm, we sign the contract. For large projects, we offer free online project presentations.

We recommend a combined solution of skylight panels, Detai waterproof flashings, and butyl sealant: the skylight panels are custom-cut to size, Detai flashings are used at the joints to seal the pipe penetrations, and butyl tape provides a secondary seal at the seams. This approach has been successfully applied to numerous large-span projects, achieving the dual goals of “natural daylighting + 25-year leak-proof performance.”

Yes, but a tailored selection is required. Based on the corrosion class (C1–C5, according to ISO 12944), we recommend: ① replacing galvanized fasteners with 316 stainless steel fasteners; ② applying an enhanced anti-corrosion coating; ③ using typhoon-resistant gaskets; and ④ implementing a highly weather-resistant waterproofing system. We have hundreds of coastal and chemical‑industry project case studies available for reference.

Full-scenario coverage—industrial plants (steel‑structure/concrete roofs), logistics warehouses, sports venues, airport terminals, commercial complexes, agricultural greenhouses, and prefabricated buildings. From small warehouses of 1,000㎡ to industrial clusters spanning 100,000㎡, we offer mature solutions.

ROOF-LOK is a wind-resistant washer specially designed by ITW for extreme climates, with a wind resistance rating of up to Class 17 (equivalent to the standard for Category 5 hurricane zones), and has passed rigorous certification from Miami-Dade County—the area in the U.S. most frequently hit by hurricanes. Applications: coastal regions, typhoon-prone areas, and industrial buildings requiring wind resistance of ≥ 1.5 kPa.

Butyl tape is a high-performance sealing material composed of butyl rubber and aluminum foil, with a temperature resistance range of -40°C to +120°C, UV resistance, aging resistance, and it never cures over its lifetime. Ordinary tapes (such as PVC or foam) will harden and fail within 1–2 years. Butyl tape is primarily used for sealing the joints of skylights and roof nodes, serving as a critical detail component that ensures a roof remains leak-free for 25 years.

Our skylight panels come in two grades: ① Super weather-resistant—resists UV aging for over 15 years, without yellowing or cracking; ② Grade‑1 flame-retardant—meets the GB 8624-2012 B1 flame-retardant standard, with an oxygen index ≥ 32, suitable for industrial buildings with fire‑protection requirements. Both can be custom‑cut to size.

Detai uses an integrated EPDM/silicone molding combined with an aluminum foil composite base, designed for a service life of over 25 years, and is backed by a 25-year warranty from the Deks factory in Australia. We offer 24/7 after-sales support—should any quality issues arise (excluding man-made damage), we will dispatch technicians to conduct an on-site inspection and provide a solution within 48 hours.

Buildex is a top-tier steel‑structure fastener brand under the U.S. ITW Group. Its key differentiators are: ① Higher drill‑tail hardness—molded in one piece without burning the drill bit, boosting installation efficiency by over 30%; ② EPDM rubber washers—resistant to UV degradation for more than 25 years, with sealing performance far surpassing ordinary silicone rings; ③ Coating process—rust‑proof performance meets ASTM standards, making it suitable for direct use in highly corrosive environments such as coastal areas and chemical plants.

Standard parts can provide free samples (shipping costs borne by the customer).

We offer a one-stop service, from product selection and system integration to technical guidance and after-sales support. Customers only need to provide project drawings or technical specifications (roof type, span, wind resistance grade, insulation requirements, etc.), and our technical team will deliver recommended construction details.

We offer a complete range of steel‑structure roofing and wall systems, encompassing seven major categories: ① Fasteners (self‑drilling screws, waterproof rivets, self‑tapping screws); ② Waterproofing series (Detei flashing, waterproof breathable membranes, vapor barriers, butyl tapes); ③ Smoke ventilation (JUNQIN natural ventilators); ④ Insulation materials (glass wool, rock wool, skylights); ⑤ Membrane series; ⑥ Washers (ROOF-LOK typhoon‑resistant washers, etc.); ⑦ Other auxiliary materials (Sika sealant, silicone sealant, galvanized brackets, end caps, wire mesh). We provide bundled system quotations and can also supply individual items.

Shanghai Junqin New Building Materials Co., Ltd. was registered in 2005, focusing on steel structure components, with ICP filing number沪 ICP 备 11022656. With many years of industry experience, the company has served numerous landmark projects, including industrial plants, sports venues, and airport terminals.

Three major advantages: ① International brand portfolio—only top-tier global brands, rejecting low-end generic brands; ② System-level solutions—from fastening, waterproofing, and thermal insulation to sealing, providing complete project‑wide配套 to eliminate the cost of coordinating multiple suppliers; ③ Global online services.

We are a professional, system-based supplier of steel structure components, representing international brands such as the Buildex (BiaoDe) series of self-drilling screws from the U.S. ITW Group and the Dektite waterproof flashing from Australia, while also offering our own JUNQIN natural ventilation product line. All partner brands are officially authorized by the manufacturers, and we can provide letters of authorization and certificates of origin.