Do I need to leave any gaps between butt joints if I install the siding in cold weather? What about in hot weather?

Please keep in mind that because of the expansion and contraction nature of our material, there would need to be adequate spacing built into your installation. As a result, when installing in cold weather, you will want to build space for the boards to expand, and when installing in hot weather, you will want to install in such a way that the boards can contract without issue. Allowing your boards to acclimate to their environment for 24-48 hours before installing would also serve as best practices. Detailed expansion and contraction values can be found on our installion guide.