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The job is difficult, very uncomfortable, strenuous, and time consuming. All the nails attaching sub-floor and hardwood floor to the joist will have to be cut, the joist cut out two at a time, and then new, full-length joists installed in place. Depending on the year the house was built, this can be almost impossible to do as they will have to be position diagonally and then forced perpendicular to the direction of the floor. Once the new joists are positioned and supported on either end, the task of re-attaching the floor to the joists is undertaken. This will have to be done precisely and skillfully from underneath without allowing the fasteners (screws) to puncture through the floor into the living space. Pre-applying construction adhesive to the top of the joists is effective, but adds another difficult step to the installation (all while in the crawl space). I operate in New England and would charge $60.00/hr for the un-pleasure of this job. Of course the size of the room dictates the length of the job, but you could count on $2500.00 in labor plus materials.

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Q: What is cost of replacing the floor joists under the crawl space with hardwood floors in the house?
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