This is a good question. Usually, I would recommend maybe making a bit of Insulated Wood, just so you have a little to use for repairs or upgrades as soon as you can make them, however, I don't recommend it. If you invest in a Dryer and an Improved Carpenter's Bench, you'll produce a lot of Insulated Wood. Therefore, rather than stockpiling early, focus on getting those two workstations. You'll soon be able to produce vast quantities of Insulated Wood, and it'll be much easier than making the extra effort to have access to them earlier on.