Sister Joists with Timbascrews?

[oursurveysaid]

I’m about to sister joists onto existing ones to level a suspended floor.

BCO mentioned I could use screws instead of carriage bolts, but I didn’t quiz him any further at the time.

Does anyone have experience in doing this, and would these do the job?

https://www.screwfix.com/p/timbascrew-flange-timber-screws-gold-6-7-x-100mm-50-pack/3374j

Other than being quicker and easier to install, screws would eliminate all the hammering that could damage the plastered ceiling below.

Also, would I need to use glue to avoid squeaks, or are the screws enough?

 

[^woody^]

www.diynot.com/diy/threads/bolting-doubled-up-rafters-and-trimmers.565012/

 

[oursurveysaid]

Thanks. That thread doesn’t seem to mention floor joists though. That question was about roof timbers.

I’ve bought those Timbascrews and plan to use them, but would love to know whether I should use polyurethane adhesive as well. I’d rather not... (commitment issues )

 

[^woody^]

Same thing

 

[Nozzle]

https://www.toolstation.com/double-sided-timber-connector/p30004

Nozzle