more accurately how should one space floor boards on a cement slab subfloor? every 4quot;...6quot; also any recommendations on what type of plywood/board to use? should i use insulation or just concrete board?
now i have to ask a question why do you need a sub floor on cement and how hi do you need it to be and what is you're finished floor so we can help if we have more info there is all kinds of answer's
The current building codes frown on any concrete to wood direct contact due to the way concrete holds water. This can cause rot and mold. You might want to incorporate backer board (the cement board that you buy at hardware stores that is 3 ft by 5 ft). Some backer boards are treated or made out of special materials to withstand the water.
They have about every answer to your questions for do-it-yourself projects. It's a great site.
