Can this be used on wood deck for a long time?

Yes, That is what it is for. It keeps water off the joists that are under a wooden deck.The protection tape can last for really a long time.

Is this butyl tape sticky on both sides or only one side?

Only one side.You can watch the video provided by the seller to see how it works.

If I use joist tape, do i still need to use pressure treated joists?

Yes,The joist tape just protects the tops but no pressure treated joists would mean you have a couple of years lifespan on the deck as opposed to a decade or more with pressure treated wood.

Product description

1 5/8inch joist tape

High Quality Butyl Tape To Protect Your House,Extend Deck/Wood/Joists and Beams Life!

-Empowering Wooden Structure Protection.

A passionate carpenter, discovered butyl joist deck tape, a remarkable material that shields deck beams. Its weather resistance and waterproof properties ensure longevity. became synonymous with safeguarding wooden structures.

Trust to preserve your structures for a lifetime of durability and strength.

Butyl Tape prolong the service life of wooden deck,perfect for indoor or outdoor use.

Prevents moisture of joists.Protects the lumber from rot.

The Use Temperature Range:-20°F to 230°F.Extend the life of the deck substructure.

Create a barrier on the top of joists,which helps prevent water damage and wood rot.

From the brand