[zaphod61]

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

[ballengerb1]

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..

[creahands]

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

[zaphod61]

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

[ballengerb1]

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.

[21boat]

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

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

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.