TimR
I would worry about the pipe pulling out of the concrete block.

I would mount a piece of angle iron on the wall (hitting every furring
strip) with counter sunk flat head screws.
Make the top of the angle protruding outward.
Like this:
___
|

Run the plank through your table saw to cut a rabbit on the back/top side of
the plank.
The rabbit should be the thickness of the angle 'L' against the wall.
This will hide the angle iron when looking from the bottom of the shelf.
Then run screws through the angle iron into the top of the plank where they
won't be seen.

You could cut another rabbit into the top to make the protruding angle 'L'
flush with the top.

If you ever want to remove it all you have are some holes to patch.

Just my humble opinion.
Tom


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"TimR" wrote in message
news:nITRg.1541$tO5.745@fed1read10...
I would like to mount a 2 x 6 x 8ft (true dimensions) rough sawn
plank/shelf
over a patio door. This is on a 1/2 in drywall - 3/4" furring strip -
and
9" masonry block wall construction

Anyone have an idea on how to mount this so there are no visible
supports...any wall to support this by anchoring into the masonry
block....?...this is mostly ornatmental...there will be no heavy items
displayed on top but the beam itslef is somewhat heavy (Alderwood)

Thanks, Tim R