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Installing a TV wall mount. The issue is that the wall is 1/2" dry over 1x2 wood spaced 24 inch on center and then concrete block. What is the best fastner to to use considering the first 1 1/4" would not hold a TV mount for a 70 lb TV. Would like to secure into the concrete block. Most of the sleeve anchors I have seen online looked like they would rely more on the wood than concrete since they are only 2.25 inches long..

Any advise would be greatly appreciated.

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    What brought you to the conclusion that the furring would not hold the TV? – Edwin Oct 16 '15 at 18:42
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I would drill a slightly oversized hole through the drywall and wood, then drill full depth in the concrete for the sleeve anchors. Set the anchors flush with the surface of the concrete.

I would then use over-length bolts into the anchors, at least 3". For extra stability, I might put a metal spacer in the oversized hole in the wood and drywall, and have the bolt pass through it.

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This sounds like a perfect use of Tapcon anchors. They are hardened steel screws that actually thread into concrete once an appropriate pilot hole is drilled:

enter image description here

I'm not sure if such a specific product recommendation is bad form on this site, but I'm not sure of a more "generic" approach.

Since these are threaded, they will use the 1x2s and the concrete block for strength. Going through the drywall, then an air gap, then the block might be a bad idea unless most of the other screws are going through the 1x2s. If you can't screw the mount to the 1x2s because of their location and/or spacing, the canonical solution is to screw a between the 1x2s then screw the mount to the boards.

  • These are so cool.. Never seen these anywhere locally. – Piotr Kula Jan 16 '16 at 18:55
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Use a "wedge type" expansion anchor, you can buy them in lengths that will work fine for your application, assuming the block is filled, not hollow. Try a builder's supply store instead of a "big box" store. Hollow block would require a different type of anchor like the second picture.

Per the manufacturer of one type: "Versatile fully threaded design is standard on sizes up to 3/4" diameter and 10" length."

enter image description here

enter image description here

  • Actually this manufacturer specifically warns against using wedge anchors in brick or CMU blocks (cinder blocks). Bricks and concrete block just doesn't have the strength and consistency of poured concrete and can't safely retain the small wedge. – JPhi1618 Oct 16 '15 at 18:58
  • If you read the information in your link you will see that the danger is with anchoring to the block material itself or of penetrating into the hollow portion. Wedge anchors are perfectly suitable for CMU block which is filled with concrete, hence my answer specifically pointing that out; as long as the wedge portion is located in the concrete fill and not the wall of the CMU. I have used them many times in this manner. I should have clarified that the anchor length (and hole) must extend deep enough to ensure the anchor wedge area is in the concrete fill. – Jimmy Fix-it Oct 16 '15 at 19:30
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    Ok, my confusion was with your use of "filled". I thought you meant filled as in a solid brick, not filled with concrete. – JPhi1618 Oct 16 '15 at 19:38
  • In my area CMU is often filled with concrete (but not always, and sometimes only partially filled or fill is staggered, so you never really know until you drill... but nothing is ever easy i guess!) – Jimmy Fix-it Oct 16 '15 at 19:42

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