I am building a cabin and will be using 2x10 floor joists at 24" on center. Can I place 2X6 tongue and groove lumber directly on the joists as the only flooring material.

Thanks

Where are you located? What species of wood is the 2x6? In the USA most building codes would require the joists to be 16" oc. I would recommend a 3/4" tongue and grove ply sub floor to avoid noise and deflection and then a layer of rosin paper..

I agree with Bob.

16'' o.c. floor beams will give u a better base for subfloor and finished T&G.

Depending on location should also think about insulation in floor.

Good luck

Chuck

Thanks, I looked at the plans again and they are 16" on center. My mistake. The flooring is J grade 2x6 fir. The floor is on the main floor and there is a basement underneath that will be heated. This is only for our summer cabin. Would the 2x6 be sufficiently strong for the joists at 16" OC

For a summer cabin you may get away with the 2x6 but you must check your building codes that apply in your area. My cabin was a Lindal cedar home kit and built before the codes where updated. The 2x6 cedat T&G does deflect but fir is stronger. 3/4 ply sub floor will not be that expensive and will provide a much better surface.

Zaphod. Obviously keep to code but to add some old dog building practice here we use to use 2x8 joist 16 oc and run the 3/4 pine T&G flooring diagonal. We do this in decks also but usually use 2x10s.

All the old buildings here are a true 3/4x4" T&G perpendicular to the joist and no problems.

When angeling a floor like this the change in structural mechanics is unique. By running the boards at a 45 to joist you change how the joist beside the one you are stepping on to deflect less. It offsets the load to a sister joist further away from you changing the load spread pattern

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I would recommend a 3/4" tongue and grove ply sub floor to avoid noise and deflection and then a layer of rosin paper..

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If you decide to go this route don't forget caulk adhesive on the 2x10s to keep that first floor/sub floor squeak out.

To tweak it lat some board 90 to the joist and others at a 45 to joist and test out the 3/4 and deflection of joist.