thanks for your answers

am i the only one to ever ask this question or try this methos?

You should try posting it in Gardening Exchange or Landscaping Forums.

You posted in "How to use the discussion board"

I personally have never heard of such a thing. Why would you want to run the risks of having such harmful chemicals leech into the soil around your plants and or veggies? Is it for weed control? There are other methods that an organic gardener can take to try to control weeds, if that's the reason. Please view some of the other forums that can help direct you to a solution.

Kathryn,......You do not say what kind of hardwood has been used or planned for your raised beds. Hopefully you're NOT considering the green-tinted, pressure-treated stuff....with a copper arsenate treatment ! So, why the tar paper ? You will find that "redwood" is quite durable through the years and an inch of coarse sand or gravel directly below each piece minimizes water at that lowest side. Truly, I see no need to line the inside of your selected wood framing. -- Inside these raised beds...how deep is your prepped soil before transitioning into the native soil below this location ? A depth of 8" to 12" should suffice for growing most things, but create that zone above the native host soil that has also been mechanically broken-up too, and put some chunky compost down there so you have better drainage and can entice earthworms to visit....and come up for more food.
Build the soil and they will arrive. Good luck with your 2009 gardens.