In hot weather you need a way to stay out of the heat, and it can’t be too taxing to build, so in this case I would go with the basic lean-to, adapted to your local conditions and building material. They are simple and quick to build and will get you out of the heat. They also offer pretty good protection from rain if you take care in the construction.
I prefer the tripod method of building a lean-to if you have the right materials for it. Basically two sets of three poles lashed together and set up in a tripod. The tripods should be shoulder to head height. They are set up however far apart you would like the width of your shelter to be. You then lay a pole across the top supported by the top of each tripod.
The tripods should be set in such a way that one leg is pointing away from the other tripod; this gives you two parallel surfaces facing each other to work with. Lash a short pole across the inner two legs of each tripod about thigh height. You should now have a place that you can lay poles between the tripods and this will become your raised bed.
Next find several long poles to lean across the top pole to form the enclosed part of your shelter. You can lash them in place for a more sturdy shelter, or just let their weight and the weight of the covering hold them in place.
If you can find some small supple saplings or vines you can start weaving them into the long poles. This will help hold it all together and also keep whatever you use for covering from falling through the gaps. If you don’t have these available you can lash more poles across at right angles to the leaning ones.
Once you have the basic framework and cross weaving done you can start putting your covering in place. If you have a tarp just tie it in place and you are done. If not, the traditional covering in the north is evergreen branches and in tropical climates it is palm fronds. Layer them in place starting at the bottom and working your way up so any rain will run off better. If you have weaved the vines in tightly you can even cover this with debris a couple feet thick. In some places you may find plants like skunk cabbage that has large leaves that you could possibly use to “shingle” your shelter.
If you are in a rainy area you will need to build the roof at a steeper angle than if you are in a desert. In the desert you may only need the poles for shade. A lean-to is what you make it, practice several varieties using local materials so you know what works best when you need it.
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