Finish
Unless specified otherwise, all Pine Valley shelters are made from corrugated polypropylene. We do our best to limit undesirable creasing and scuffing during manufacturing. However, packaging and handling can produce creasing in areas outside of the intended fold areas. These are not defects, and they do not compromise the structure of your emergency shelter unless they are within 2 inches of a 3-score intersection. Polypropylene is an extremely resilient material, and as shown in our testing videos, rebounds to its original shape with little or no deterioration even when flexed hundreds of times

The Pine Valley Shelter is designed to be a low cost, fast set-up, temporary shelter. Continuous exposure of polypropylene to ultraviolet light (the sun) will deteriorate the material causing it to discolour and become brittle. Do not expect your shelter to replace the metal garden shed. Temporary and intended use for trade shows, ice huts, command posts etc. will render long life and reliable performance. Disaster relief use meets or exceeds equivalent service life of a canvas tent.

Form
The shelter 'tunnel' (one-piece roof, side-walls and floor) will not stand straight without the end walls installed. The 'wet noodle' nature of the freestanding tunnel should be limited to the period of set up time, as wind can quickly lift it like a kite. Always anchor the tunnel as soon as possible, and install the end walls.

Fit
Panels are cut and scored to production capable tolerances. For proper fit, it is critical to align the peak of the end walls with the peak of the roof. Otherwise, warping and ill-fitting end panels result.

Function
Polypropylene units can be set-up and knocked down indefinitely, with no fatigue cracking occurring in the folds. However, in extreme cold, the material is more susceptible to impact damage in the folds. We make no guarantees regarding impact performance in extreme cold.