Quick Answer
A bigger tarp may not always be better for lean-to shelters because it can create structural instability, make it difficult to secure, and weigh down the supporting poles or branches, potentially causing them to break.
Choosing the Right Tarp Size
When selecting a tarp for a lean-to shelter, it’s essential to consider the space where the shelter will be built, the strength of the supporting structure, and the desired level of weather protection. A general rule of thumb is to use a tarp that’s slightly larger than the space where the shelter will be built. For example, if the space is about 8 feet wide, a 10 x 12 foot tarp would be a good choice.
Securing the Tarp
A larger tarp can be more challenging to secure to the supporting poles or branches. To minimize the risk of the tarp blowing away or sagging, use rope or twine to tie it down to multiple points on the structure. Aim to create a slope of about 20-30 degrees to allow rain to run off. Use stakes or rocks to weigh down the edges of the tarp and prevent it from flapping in the wind.
Structural Stability
A larger tarp can put additional stress on the supporting structure, potentially causing it to collapse. To mitigate this risk, use multiple poles or branches to support the tarp, spaced about 3-4 feet apart. Make sure the supporting structure is sturdy and can withstand the weight of the tarp and any additional loads, such as snow or wind.
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