Timber flooring - joist directions

I apologise if I am doing this wrong. I just found your forum and after reading some of your Q&A thought you may be able to help me. I am laying a 19mm h/w floor over yellow tongue. I am happy to nail through to the joists or just to the yellow tongue. What sort of glue do you glue the h/w down with and if nailing to the yellow tongue only how far apart do you nail?

Thanks for the help.

I used Bostik ultrastick as recommended elsewhere on the forum. I nailed every 300 - 450 mm. Most of the time I tried to go into the joists.

I used a Bostik Applicator Gun for the glue which I was able to purchase through Bunnings special orders.