What PSF means
Snow-load claims are commonly expressed in pounds per square foot (psf). At a basic shopping level, a larger published PSF number indicates that the manufacturer is claiming more roof-load capacity under its specified conditions.
Snow weight is not just snow depth
Dry powder and wet, dense snow do not weigh the same. Ice, drifting and repeated freeze/thaw cycles complicate the picture further. That is why “how many inches of snow?” is not a safe substitute for the manufacturer’s engineering or local design load.
Current examples show why comparison helps
Mirador publishes 20.8 psf for the 111S under its stated professional assembly and anchoring condition. FlexPatio publishes 20 psf for POWER+ Gen 2 and 50 psf for POWER+ PRO Gen 2. Those figures help separate product tiers, but they still do not establish what your particular site requires.
Verify the exact configuration
Do not treat a product-page snow number as a structural design for your property. Span, size, installation, roof position and local code requirements can matter. Verify the exact model and local requirements before purchasing.
Sources checked for this guide
- https://www.miradoroutdoor.com/products/111s-10x13-white
- https://flexpatio.com/products/flexpatio-power-gen-2-motorized-pergola
- https://flexpatio.com/products/flexpatio-power-pro-gen-2-motorized-pergola
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