Building ground level deck... Concerns: short lifetime expected due to lack
of space for proper air circulation under deck, plus high moisture levels
from both sky and ground (i.e. rainy Vancouver weather and high water-table
clay soil, respectively). I've put much thought and research into how to
best counter this... Now I've finally arrived at my final choices of
strategy/design/materials, as follows: Ipe for the decking material, drain
rock down to a depth of 9" to 12" below grade (in conjunction with
pre-existing landscape drainage), thorough sealing of PT frame joists and
beams with double wet coat oil based paint/sealer.

Now, here's my question: How can I _keep_ the frame (i.e. joists) sealed
against moisture in spite of the fact that the screws (for fastening the
decking) will be piercing whatever sealer/paint I've put there?

I've read that dipping the deck screws in hot paraffin wax prior to use will
cause the screws to form a water-tight seal (as well as, primarily of
course, facilitate the screw's entry into the wood). But I'm having
difficulty visualizing how this would actually be accomplished ... Unless
there is maybe some kind of simple and portable hot-wax-applicator-gun or
similar device available that I am just not aware of (...?).

Ken