Thanks for the reply. After hearing what you said, I am going to fill all grout lines with Henry’s 549. We live in Ohio, and we have plenty of sun exposure with lots of windows on this portion of the house and I don’t want to take a chance! As for the plank direction, I am leaning on starting in the dining room and working towards the kitchen. I watched your video’s on using the string line and assume I would have to use this method to extend the line into the study since the exterior wall continues to jog in a couple times. What are your thoughts of starting on the opposite end of the house (great room and kitchen) and working towards the dining room and study? I understand there will be some working backwards but thought it might be easier for me to keep a straight line? Also, when looking at there website…it says this is a tight lock ( tap down) locking system. Is this considered a drop and lock? Thanks again for all your help!