Asked on Dec 2, 2011

I am thinking of flooring my attic, with the intention of using it as a storage area for now and possibly insulating it

Tidewater InsulatorsIts Really Concrete, Inc.Glkirk Builders Inc.


and finishining it a bit more later. What would be the best flooring material to use? OSB is by far the most economical, but would there be advantages to going with particle board (at 3x the cost) or utility hardwood plywood?
7 answers
  • KMS Woodworks
    on Dec 2, 2011

    I'd go with T & G ply...this is what is used for subfloors..

  • Dennis B
    on Dec 2, 2011

    I'd use 1/2 - 3/4" exterior plywood. If need be it could be ripped into strips to fit through openings to put it in.

  • We use OSB all the time in attics when we insulate. We stack 2x6 at right angles to the existing floor joists and place them at 24 inch centers. And as Dennis said we cut them in down as needed to fit. We do however use screws not nails to fasten. primary reason is the impact that the hammer has on the ceiling below can cause all sorts of nail popping which then requires repairs and paint. Using screws is a non impact way of fastening them down. Particle board is way to heavy and is not considered as a structural material for any type of span. Stick with OSB or plywood. What ever you can get for the best price.

  • MCL
    on Dec 9, 2011

    Make sure the structure, i.e. truss bottom chord or ceiling joists, can take a storage load. Codes vary, but it's somewhere around 80 lbs./SF. Personally I agree with KMS and would use 3/4" T&G plywood, especially if you want to finish it with another flooring later.

  • Glkirk Builders Inc.
    on Dec 9, 2011

    MLC has the prelims down. It is very important to be sure your joists are up to code. Now is the time to upgrade. Code says you need 3/4" . continious material. IE 3/4" T&G plywood or 3/4" T&G osb.

  • Its Really Concrete, Inc.
    on Dec 9, 2011

    our garage is truss framed onsite 16" o/c - 2 x 6 bottom & 2 x 4's up the angles,,, the floor is 1/2 ply screwed down,,, heavy enough for storing the Christmas stuff, daughter's college banners, & spare luggage - tnx for the code update inf - however how would 1 upgrade joists to carry addl deadload of 3/4" t&g ply - sistering ? hometalk scores for me again !

  • Tidewater Insulators
    on Dec 9, 2011

    Make sure you leave enough room for insulation under the flooring. Until you finish the room off, this could be a major area where you could loss heating through the ceiling. Compressing the insulation lowers the R-value and effectiveness.

Your comment...