Can I use glue or caulk with TimberTech?
Do not use caulk to fasten TimberTech Floorizon planks or to seal between any of our planks. This will impede the drainage of the plank and inhibit the natural expansion and contraction of the planks. Some contractors have reported success with Premium PL 2000 construction adhesive to support the fastening of other planks, but it is not recommended as the primary means of fastening the planks or fascia. Again, do not use caulk to seal between the planks.