Short answer: a polycarbonate greenhouse panel does not have one dependable lifespan number. Service life depends on the exact sheet, its UV protected face, climate exposure, installation, compatible seals and cleaning. Use the panel warranty and technical data as the starting point, then define inspection and replacement triggers for the project.
Separate panel life from greenhouse life
The steel or aluminum structure, fasteners, seals and polycarbonate sheets age at different rates. A sound frame may remain in service while selected sheets, closures or gaskets are replaced. Buyers should ask for separate warranties and replacement procedures instead of treating the greenhouse as one item with one expiry date.
Do not infer service life from thickness alone. Multiwall geometry, resin, UV protection, color, span, support spacing and installation direction affect performance. Palram's SUNLITE technical information, for example, distinguishes products with UV protection on one or both faces and ties warranty coverage to specified installation and maintenance. The correct conclusion is to verify the proposed product, not to copy one brand's warranty to another sheet.
Evidence to request from the panel supplier
| Document or input | What to verify | Why it matters |
|---|---|---|
| Product identification | Manufacturer, product family, wall structure, thickness, mass per area, color and batch traceability | Generic "PC sheet" descriptions cannot be checked against technical data. |
| UV protection | Protected face or faces, marking method and installation orientation | Installing a protected face in the wrong direction can expose the sheet to unintended weathering. |
| Optical and thermal data | Initial light transmission, haze, solar properties and U-value for the exact configuration | These are the starting values for crop light and energy calculations. |
| Warranty | Covered changes, measurement method, exclusions, claim process and required maintenance records | A warranty is useful only when the acceptance and claim conditions are clear. |
| Structural tables | Allowable spans, support spacing, wind and snow assumptions, fastening and thermal movement | The sheet and frame must be checked as one load path. |
| Installation guide | UV side, flute direction, edge closure, drainage, expansion clearance, fasteners and compatible sealants | Water entry, restraint and chemical incompatibility can shorten useful service. |
What usually ends useful panel service
Replacement should follow measured loss of function or visible damage, not a calendar date alone. Inspect for cracking, brittleness, bowing, loose fixings, damaged closures, failed gaskets, water or biological growth inside flutes, and changes in clarity that affect the crop plan. Record the location and orientation because roof, sidewall and shaded sheets do not receive the same exposure.
Compare photographs from the same viewpoint and lighting conditions. Where light transmission is important to production, use a documented measurement method and keep the original product data. A handheld light reading on one cloudy day cannot establish panel degradation by itself.
Installation details that deserve a pre-handover check
- Confirm that the marked UV protected side faces the specified direction.
- Check that sheet flutes, end tape and profiles drain as the manufacturer requires.
- Verify expansion clearances and fastener details against the expected temperature range.
- Check that sealants, cleaners and insect-control chemicals are listed as compatible.
- Photograph panel labels, batches, edge closures, fasteners and any field cuts.
- Store spare sheets and profiles in the manner stated by the manufacturer.
Maintenance and replacement planning
Use the sheet manufacturer's cleaning instructions. A common approach is clean water, mild soap and a soft cloth, followed by a rinse, but the approved method and chemical list must come from the selected product. Avoid abrasive tools and unapproved solvents. Do not allow workers to step directly on greenhouse glazing.
Plan how a damaged sheet can be isolated and replaced without removing unrelated bays. Keep the current product code, drawings, supplier contact, fastener specification and warranty records. If the original panel is discontinued, require an engineering and crop-light review before substituting a different geometry or optical product.
Information to send with a polycarbonate greenhouse RFQ
- Project location, elevation, design wind, snow, hail and temperature range.
- Crop, production calendar, target light conditions and condensation concerns.
- Roof and wall geometry, span, support spacing and areas exposed on both faces.
- Required optical, thermal, fire and code documentation.
- Cleaning chemicals, crop-protection products and expected maintenance access.
- Warranty expectations, spare-panel quantity and replacement availability.
- Installation supervision, inspection records and handover documents.
Related CFGET planning pages
Compare the polycarbonate greenhouse options with the greenhouse energy design guide. The commercial project planning guide lists the site and responsibility inputs needed before quotation.
Technical references
- Palram: SUNLITE product data, installation documents and warranty resources
- Palram: SUNLITE installation, cleaning and warranty guide
- Oklahoma State University Extension: Greenhouse structures and covering selection
Comparing polycarbonate greenhouse proposals? Send the site loads, climate, crop-light targets, sheet data and warranty documents to CFGET. A useful comparison identifies the exact panel and installation scope.