Can I Cover A Summer House With Plastic To Stop Rot?

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Plan is to build an insulated summer house out of timber with 18mm plywood sheets for the exterior.

I just pulled a shed out of the same location which was rotten around the back.

The summer house will be on a concrete base (not done yet), probably coming up 100mm above ground.

I wanna cover every part of the summer house with plastic to prevent wood exposure to elements.

Is it wise to buy some massive sheet plastic panels and screw them onto the 18mm plywood, then seal any joints with mastic?

And if the front of the summer house is covered with composite wood-effect panels, can I seal the joints between those as well?

I'm asking because this would essentially lock any air out so the wood won't be able to breath. Insides of summer house will be plasterboard + skim coat.

Thanks.
 
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