Answer: When moisture is trapped against wood, it will eventually cause rot. Lining the space between the soil and the siding was a good idea; it keeps moisture from the soil from penetrating the siding, but it will also trap moisture between it and the siding. Without good air circulation, the moisture can compromise the siding. I don't think there's any easy way to remedy the problem. You only need an inch or two of space between the siding and the raised bed to encourage good air circulation. Depending upon the construction of the bed, this may mean that you simply need to dig out the back six inches and set bricks or concrete blocks along the back. Or, you could set planks along the back; as long as there is no wood-earth contact that directly touches the siding of your house, everything should pass inspection. Best wishes with your renovation project!
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