On June 1, 2010 at 17:04, Gizmologist09 said...
Do you have a camera view system you could use to look inside the wall to see what the support structure is for the brick?
That would be best, but a small automotive mirror and a flashlight may get you where you need to be.
What WILL work:
1. A carpenter's rule (the folding kind) which you grasp in your hand, stick into the void through the holes left by the missing bricks, will allow you to measure to the studs behind the bricks.
2. Transfer that measurement to the face of the fireplace and drill through mortar joints with a masonry bit until you hit the studs.
3. Use a 6" lags to install the mount
Solves two problems.
Allows the mount to be certain to hold the display and allows the fireplace to be returned to "normal" by simply mudding the holes you've drilled.