TW25
Tidewall TW box series. Extruded vinyl, Box profile.
| Property | Imperial | Metric |
|---|---|---|
| Width | 18 in | 457 mm |
| Height | 6 in | 152 mm |
| Thickness | 0.25 in | 6.35 mm |
| Weight of wall | 3.27 lb/ft² | 16 kg/m² |
| Moment of inertia | 27.4 in⁴ per ft of wall | 3,742 cm⁴ per m of wall |
| Elastic section modulus | 9.1 in³ per ft of wall | 489 cm³ per m of wall |
Allowable moment 2,464 ft-lb/ft; ultimate moment 4,929 ft-lb/ft; E = 380,000 psi; UV-stabilized exterior-grade rigid PVC. Wall weight is calculated from Tidewall's weight per foot and section width. Tidewall prints the weight as 4.9 lb/ft and 7.1 kg/m, which do not agree exactly; the lb/ft value is used.
Source: Tidewall website, TW25 technical data (tidewall.com), Oct 2026. Confirm properties with the manufacturer before design.