Canexel warping - How to evaluate the risk, cost of maintenance and cost of replacement?
I think Canexel is something that's only available in Canada, so I cannot speak to the siding itself. Also (being from the states) I don't know much about the process of purchasing a home up there either. But here's what I would do if I were buying this home. It looks to me like the siding was laid over furring strips, and the installer probably cheaped out and didn't lay the proper number of strips down to prevent overlap or warping. Laying furring strips is a common practice here in the US under siding (typically vinyl which has a lot more flex - less so over hardie or wood because those are easier to offset for the most part). Since this is a purchase I would have the current homeowner repair before signing. It's common in the US to have repairs done as part of negotiating the contract. Again, I don't know what Canexel is so that material may factor into it as well. Best of luck!