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Installing 1/2”x 5” hardwood (wood, not pressboard), what nailer/stapler and size staples should I use?

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Check the installation instructions that come with the flooring to see what they recommend would be my thought.

Assuming you are renting a compressor and nail gun, they will have what you need for your project. Are you putting down Plywood or nailing to existing sub-floor?

Make sure you put down an adequate vapor barrier as well. Allow for 4-6" overlap of joints.

I already have a compressor and floor nailer (16 gauge). In searching the interweb, many recommended a 1 1/2” 18 gauge staple. I’m not sure if this will work in my gun. I also will be installing over underlayment. Nailing to existing 3/4 plywood.

Excellent, thanks