Hello!
I am installing Bellawood Brazilian Teak 3/4" x 3-1/4" in several rooms. The main room is 13' x 19' with 3/4" cdx subfloor. The floor joists run parallel with the 13' room width, so the flooring will installed running length of the 19' room. I am using 2" L-cleats and pneumatic nailer. Also using 15# roofing felt underlayment.

1) Would a spline be required or maybe preferable with the first board starting in the center of the room (at 6-1/2')?
2) Or maybe my question is at what dimension should I be concerned concerned about the brazilian teak expansion?
3) Does it matter what type of wood I use to create the spline (e.g. oak or fir strips from the home store)? I plan to glue the spline to the groove using gorilla glue with tight fit.

Thanks, Dan

Not such a big room you need to switch directions I think. Watch out for that gorilla glue, it's like pure urethane and swells quite a bit. Least thats what I heard.

for splines I usually use the scraps of the flooring and just use regular wood glue along wit nails. The Gorilla Glue does expand, I used just one drop while reinstalling spindles on a job and it oozed out of each one.

Ya, If you dont use the flooring scraps you run the risk of the spline not seating correctly,( it can peak the seam of the adjoining row).

Thanks for the advice! I skipped the spline in the first room, but it was unavoidable in another room so I used scraps and wood glue as recommended (instead of gorilla glue).

Great site, which helped with my DIY questions. I will recommend it to friends considering hardwood flooring.

Thanks, Dan

Spline is only necessary for back laying. Just make some out of whatever type of flooring you are using.