Why Choose ASA Co-extruded Synthetic Resin Roofing Tiles?
Weather Resistance. The top layer consists of an ASA (Acrylonitrile Styrene Acrylate) co-extruded coating, which provides resistance to UV-induced aging. This ensures a significantly slower rate of fading and chalking compared to single-layer PVC tiles. When sourcing materials, you may require suppliers to meet the specifications outlined in the standard SH/T 1846-2024, "Specialized Acrylate (ASA) Co-extrusion Materials for Synthetic Resin Roofing Tiles." For projects in Fujian Province, the local standard DB35/T 1641-2017 may also be referenced, while the finished products should comply with the industry standard JG/T 346-2011, "Synthetic Resin Decorative Roofing Tiles."
Corrosion Resistance. The material offers overall resistance to acids, alkalis, and salt spray, making it suitable for coastal areas and environments with mild corrosive conditions. However, it should not be used in facilities exposed to strong acids or alkalis; in such cases, APVC or FRP (fiber-reinforced plastic) roofing tiles should be used instead.
Thermal and Acoustic Insulation. Thanks to their multi-layer co-extruded structure, these tiles have lower thermal conductivity than metal roofing, resulting in significantly lower temperatures beneath the roof and reduced noise during rainfall.
Lightweight. These tiles impose a minimal load on existing roof structures. In many projects, they can be installed directly over existing purlins; however, a structural assessment must be conducted first-decisions should never be based on guesswork or experience alone.
Conversely, the use of synthetic resin roofing tiles is not recommended in the following three scenarios: where the roof slope is less than 15°, where a Class A fire rating is required, or where the roof is subject to frequent heavy-duty foot traffic or loads. (Images 03, 04)
III. Structural Specifications (Determining Leakage Prevention)
Suitable for roof slopes between 15° and 80°; for slopes below 15°, a separate waterproof layer is required.
Purlin spacing must be ≤660mm, with closer spacing at the eaves and ridge.
Self-tapping screws must be driven into the crests of the corrugations, fitted with waterproof washers, installed vertically, and tightened with care to avoid over-tightening.
Longitudinal overlap must be ≥300mm (increased in high-wind areas); lateral overlap must cover at least one corrugation.
Use matching ridge tiles and flashing components for eaves, ridges, and gutters; apply neutral-cure silicone sealant at all flashing joints.
Leave gaps for thermal expansion between the tiles and fasteners-do not "fix" the tiles so rigidly that they cannot move.
(Images 05, 06)
IV. Construction Workflow
Remove old roofing → Inspect purlins and roof trusses (reinforce or repair any corrosion) → Mark layout lines → Install tiles row by row, starting from the eaves and moving upward → Install flashing and edge trim → Conduct a water-spray test. This project was completed in [Duration] days with a crew of [Number] people, utilizing a phased construction approach that allowed operations to continue without interruption.
(Image 07)
V. Three Key Inspection Criteria
Fastener Placement: Ensure the washer under the screw head is compressed flat, with no cracks or indentations.
Overlaps: All overlaps must follow the direction of water flow; ensure sufficient longitudinal overlap and correct lateral alignment.
Water-Spray Test: Subject the roof to continuous water spraying for 2 hours; verify that no leaks occur at the ridge, gutters, pipe penetrations, or flashing joints.
(Image 08)
Conclusion
When renovating an old roof, choosing the right tile is only half the decision-the other half lies in the structural detailing and edge finishing. To receive the detailed construction node drawings and product selection list for this system, please reply with "Resin Tile" (树脂瓦) in the chat.