Quick conclusion
Choosing 9 square waves or 12 round waves must follow the profile of the existing roof sheet, not based on intuition. The correct sheet must match the wavelength, height, top–bottom shape, and overlap side. If there is no drawing yet, Please send a metal sheet sample or an actual measurement photo for the factory to confirm.
Do not choose based on preference: must match the existing roof
The wave number is just the initial name. The replacement sheet must match the wavelength, wave height, crest/trough shape, overall width, effective width, and overlapping side. Two sheets both called “9 waves” can still have different profiles and may not fit tightly.
Compare the two Hưng Thịnh Phát specifications currently published
| Criteria | 9 square waves | 12 circular waves |
|---|---|---|
| Main geometry | Top/bottom in square or ladder shape | Curved/round wave |
| Declared nominal width | 107cm | 90cm |
| Selection conditions | Metal roof with corresponding cross-section | Metal roof with corresponding cross-section |
| Must not be inferred | Effective width, span, load from 9-wave name | Effective width, span, load from 12-wave name |
How to compare samples before placing
- Place the square perpendicular to the wave direction, measure multiple cycles from the same peak to peak location.
- Measure height from bottom to top, record both edge shape and the panel side beinghusband.
- Measure the full panel width and the actual coverage between two installation edges.
- Take a photo of the ruler lying on the section; it's best to send an intact sample segment.
- Require the factory to confirm with a cross-section drawing before production.
Four mistakes causing seam gaps or sheet lifting
- Only count the number of waves without measuring pitch and height.
- Use the nominal width as the effective width to calculate the number of sheets.
- Reverse the overlapping side or do not check the wind–drainage direction.
- Forcing sheets with a different profile using screws causes deformation and increases the risk of cracking/leakage.
Data to be sent to Hưng Thịnh Phát
Send photos of the entire roof, cross-sectional photos with a ruler, sheet samples or manufacturer drawings, sheet length, purlin spacing, slope, and quantity. Direct inspection 9-square wave product and 12-round wave product.
Send the sheet/sample profile and roof dimensions; Hưng Thịnh Phát will check the profile before confirming production.
Send documents to receive reportpriceReference sources and limits of use
- ASTM D3841-21: scope of classification, materials, and testing of fiberglass-reinforced polyester panels used in construction; the standard also notes that specific applications may require different performance levels.
- ISO/CIE 10916:2024: procedure to calculate the influence of daylight on building energy performance.
- MCRMA Technical Paper 1: structure, arrangement, and material selection of rooflight for metal roofing systemtype.
- NZ Metal Roofing Manufacturers – Natural Light Materials: compatible with the profile, characteristics, and differences between GRP and Polycarbonate in industrial roofing.
- Nova Construction Products – Rooflight Application Guide: focal point for guiding rooflight and self-drilling screw installation.
Technical limits: This article is used to screen options and prepare quotation data, not to replace construction drawings, structural calculations, light–heat simulations, fire regulations, or specific instructions for the actual roofing system. All thicknesses, spacing, loads, light transmission, fire resistance, durabilityChemicals, warranty, and price must be confirmed with the factory documentation of the shipment before signing the contract or starting construction.
View the product, material, and specification table at guide to choosing Composite/FRP translucent roofing sheets.
Contact Hưng Thịnh Phát for consultation on specifications and pricing at the factory.
