Does Brazilian Redwood’s density make it difficult to build with?

Not if you keep a few simple tricks in mind… Pre-drilling holes for the screws can help to prevent splitting the wood. You may also want to consider using a wax sealer that will help prevent the ends of the boards from cracking. The other big thing is up to us: making sure the lumber is kiln dried prior to being sold. Kiln drying is the removal of excess moisture from the wood in a dry kiln; this process creates decking that is more stable with less risk of twisting, crooking, or warping.