I am remodeling my finished attic in 1920's colonial and am getting ready to install southern yellow pine flooring to try to match the rest of the house. All of the floors in my home have settled over time towards the middle of the house, approximately 2" in the center. I have had a structural engineer inspect my home and it is structurally sound - the main support beam in the basement was undersized but has since been strengthened by adding a post. The existing floors crack quite a bit but we accept this as part of living in an old home.
My question is how much slope can I have on my existing third floor and successfully install the new pine flooring. I'm assuming too much slope will cause the tounges to split or cause excessive creaking. The floors slope about 1.5"- 2" over 15' (rough guess), both parallel and perpendicular to the joists. The existing subfloor which I plan to leave in place is 6" wide, 3/4" tounge and groove pine planking. The planks are perpendicular to the joists so I plan to run the new floor perendicular to the planking (parallel to the joists), which matches the long edge of the room. We are prepared to live with some creaks and want to avoid leveling the floor if at all possible - we are already way over budget and also do not want to add more weight. Can we install the floor as is? Any thoughts?
Thank you for your time.
I would not install hardwood over your existing floor as you will risk it buckling over time. You really need to put down floor leveler, then a new sub floor, the start the install. The hardwood can only run diagonal or opposite the direction on your main support beams. With 6" tongue and groove boards you have no is almost the same thing as putting a hardwood floor on top of another hardwood floor which you cannot do.
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