Quick Answer
A tarp shelter for heavy rain should be set up with a minimum of 6-8 inches of clearance around the edges to allow water to run off, and secured using multiple anchor points and guy lines. A "A-frame" or "lean-to" design is ideal for heavy rain, as it allows water to run off easily. Use a tarp with a waterproof coating and a robust grommet pattern.
Choosing the Right Tarp
When selecting a tarp for heavy rain, look for one with a waterproof coating and a robust grommet pattern. The tarp should be made of a durable, waterproof material such as nylon or polyester, and should have a minimum of 6-8 inches of clearance around the edges. A good starting point is a 9x12 foot tarp, which can be used to create a simple A-frame design.
Setting Up the Shelter
To set up the shelter, start by staking down the tarp at the bottom corners with 2-3 foot long stakes, making sure they are driven in at an angle to create a secure anchor point. Then, attach the guy lines to the tarp grommets at the top of the A-frame, staking them down about 6-8 inches from the top of the tarp. Use multiple anchor points and guy lines to secure the tarp and prevent it from flapping in the wind.
Additional Tips and Considerations
In addition to the tarp, consider adding a roof ridgepole to the A-frame design to provide additional support and stability. This can be made from a long, sturdy branch or a section of 4x4 lumber. Also, make sure to use multiple anchor points and guy lines to secure the tarp and prevent it from shifting or collapsing in heavy wind or rain. A simple tensioning system can also be used to tighten the tarp and prevent sagging or flapping.
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