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Originally Posted by JSH
Plywood only rots if it is neglected and allowed to stay wet
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Something too much maintenance-intensive becomes a PITA.
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Steel framing is becoming more common but the exterior of the house is still plywood. (Walls , roof, floor)
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As long as it's properly coated to protect from inclement weather, it's OK. But those structural beams which are often left unprotected are quite a problem. One of my ancestors was an engineer and had worked in the Madeira-Mamoré railway in the middle of Amazon, where attempts to use native wood to make railroad ties failed due to the lack of protection against the effects of humidity, leading to the use of ties imported from England which were previously treated with Creolin.