Installing a sub floor on an exisiting slab


Old 03-12-00, 08:47 AM
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Our living room is slightly sunk, about 2"; I don't know why, but I really do not like it, never have. So we want to raise it to meet the level of the other floors in the house. Since it is on a slab, we considered steel 2X4's, and then plywood before installing carpet. Would this be the best method? Or should we stick with wood 2x4's?
Any advise on this subject would be appreciated. Also, we would like to place insulation under the plywood, good idea?
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Old 03-12-00, 10:48 AM
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You can either use steel or wood 2x4's. If you use wood 2x4's be sure to use treated ones. Space them no more then 12" apart, otherwise you will have a bounce in your floor. The height of a 2x4 is 1 1/2" on its side. Sub flooring can only be 1/2" if the 2" difference is correct. Besure to screw down your sub flooring.Do not nail it. One screw every 6" maximum. Yes, you can put insulation between your 2x4's. You will have to use loose insulation. Not a problem. When you put down your subfloor plywood, be sure to buy the kind that is real smooth on one side so you can put your flooring right on top of it. Good Luck

Jack the Contractor
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