I am going to install composite decking on pressure treated 2x4 sleepers. The composite decking is attached via clips that slide in a groove of the composite decking. The clips only screw into the 2x4 sleepers.
Would it be better to buy the pt sleepers and let them warp in advance? I can then prune out the bad ones? If I put them in wet and screw the composite via the clips to the pt wood my fear is that the pt will warp but the composite won't be strong enough to resist the warping given it is really just floating on the pt sleepers.
The sleepers are sitting on a torch on membrane on flat and will not be fastened to the torch on or deck structure. The sleepers float on the deck and the composite more or less floats on the sleepers.