Quick Answer
COMMON TARP SIZING MISTAKES INCLUDE OVERLOOKING THE ADDITIONAL SPACE NEEDED FOR ANCHORS, FAILING TO ACCOUNT FOR TARP MATERIAL SHRINKAGE WHEN WET, AND CHOSING A TARPSIZE THAT IS TOO SMALL FOR THE NUMBER OF OCCUPANTS.
Choosing the Right Tarp Size
When selecting a tarp for a lean-to shelter, consider the number of occupants, the space needed for sleeping bags or pads, and the width required for comfort. A general rule of thumb is to choose a tarp that is at least 11 feet wide and 14 feet long for two people. For three or more people, increase the width by 2-3 feet and the length by 2-3 feet.
Tarp Material Considerations
Tarp material shrinkage is a critical factor to consider, especially when exposed to heavy rainfall. A 1.5mm polyethylene tarp, for example, can shrink by up to 5% when wet, which can compromise the structural integrity of the lean-to. To mitigate this issue, choose a tarp with a thicker material (e.g., 6mm or 8mm) or select a tarps with a silicone or PVC coating that provides additional durability and water resistance.
Anchoring and Support
In addition to choosing the right tarp size, ensure that the anchors and support structures are sufficient to withstand wind and rain loads. Use sturdy trees or poles that are spaced at least 7-8 feet apart to provide a stable base for the lean-to. Use multiple anchors, such as ropes or guy lines, to secure the tarp and prevent it from flapping or collapsing.
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