Quick conclusion
Corrugated sheets are usually suitable when needing to match the same profile as metal roofs; flat sheets are suitable for custom-designed frame systems, curbs, or walls. For greenhouses and canopies, the decision also depends on light, condensation, slope, expansion, and maintenance; there is no one shape that is better in all cases.
Select shape according to support system and drainage
Wave forms increase geometric stiffness and can be directly matched with roof sheets of the same profile. Flat sheets require their own frame, clamps, gaskets, slope, and drainage details; they should not be installed flat simply because they are called “flat sheets.”
Compare by structure, not just by aesthetics
| Criteria | Corrugated sheet | Flat sheet |
|---|---|---|
| Integrate metal roofing | Advantageous if the profile matches | Requires a separate frame/transition |
| Geometric stiffness | Supported by the profile | Depends on thickness, frame, and span |
| Drainage | According to corrugation and slope | Must design slope, batten, and gasket |
| Typical applications | Factory skylight strips, agricultural roofs | Roof/roof light/skirt according to frame system |
| Points to check | Corrugated joints, flanges, screws | Expansion, edge clamping, sagging, drainage |
Canopy: prioritize frame details and expansion
Flat panels may be suitable for a separate frame architecture; corrugated types may be simpler when the support system is designed with grooves. Both require slope, gutters, drip edges, and thermal expansion joints.
Greenhouse: assess light for plants, not just “inside”.
PAR/DLI data, diffusion, condensation, thermal properties, and cleanability are needed. Roof shape affects incidence angles and light distributionmorning; do not use the percentage of advertised light transmission as the only criterion.
Factory: roof matching profile is a practical priority
With the existing corrugated iron roof, panels of the correct wave profile usually reduce the number of transition details. Flat panels should only be used when there is a curb/rooflight frame designed as an independent system.
Six key questions to select sheet
- New roof or existing roof, which profile and support system?
- Is transparency or diffused light needed?
- Span, load, deflection, and fall protection requirements?
- How about expansion, slope, drainage, and maintenance?
- UV environment, chemicals, heat, impact, and fire?
- Is there test data and installation instructions for the correct product code?
Reference flat roofing sheet Maxlight and corrugated translucent roofing sheet Maxlight; product name does not replace the document check step.
Send frame/roof drawings, functions, bay dimensions, load, slope, and lighting requirements to compare the suitable type of panel.
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.
