Desert Structures
Tarps and fabric coverings. Shade structure profiles should be kept as horizontal and low to the ground as possible. Widely-spaced grommets in off-the-shelf tarps may rip out; more closely-spaced grommets can easily be added using kits available at hardware or surplus stores. Tarp ends can be sandwiched between wood battens. Store awnings are examples of tightly-stretched wind-resistant tarps. Canvas, denim, rip-stop nylon, and other materials can be used for sewing custom tarps and coverings. Available light tarp and shade materials:
* Shade mesh fabric. Patio and greenhouse shade mesh typically comes six to twelve feet wide. A variety of shade densities and colors are available, generally costing about $0.35 to $0.35/sq ft off the roll, and somewhere between $0.20 and $0.30/sq ft for whole rolls. Available from larger lumber and hardware outlets, and agricultural supply houses. Awning and rigging contractors can provide seaming, grommets or edging for special sizes and shapes.
* Mesh truck tarps. Well-stocked hardware stores such as Jackson's in San Rafael may have very strong black mesh truck tarps edged with grommets that run about $0.60/sq ft. These are used on pickups, gravel trucks and debris boxes. Trucking and rigging supply outlets such as Carpenter Rigging in SF and Feeney Wire Rope in Oakland have similar prices, and they can special-order any size. Trucking supply outlets may be cheaper.
* Road stabilization fabric. Concrete & masonry supply yards such as Shamrock in San Rafael have the strong black woven poly cloth Burning Man has been using for shade lately, either in whole rolls or by the foot. It's called "road stabilization fabric", Mirafi 500X or 600X. There are two widths: 12.5' wide -- 360' long -- $345 (= $0.13/sq ft); 17.5' wide -- 250' long -- $366 (= $0.12/sq ft). They sell either width off the roll at $0.20/sq ft. No edging, no grommets, and it's a very dense weave can catch the wind on vertical profiles.
* Parachutes, camo netting, and sails. Surplus stores have silk, nylon, and cotton parachutes, and camouflage netting, for about $0.50/sq ft. Check every inch of the parachute before you buy it to check for rips or rotten fabric. Used sails make very strong, often colorful, water resistant tarps, available from sail-making shops for about $0.40 to $1.00/sq ft; search online at Yahoo under "used sails".