attaching ledger board to hollow block wall

[mrb]

how can a ledger board be attached to a hollow core concrete block wall? Want to build a small room inside a larger space, the block wall and the new room's wall opposite the block wall are bearing the ceiling joists and we want to be able to put a plywood deck down and use the space on top of this room for storage.

 

[7th Kahuna]

Not sure that I follow what you are asking but to attach a ledger board I would think you would drill the block for anchor bolts and then solid grout those cells both to secure the bolt and solidify the load carrying portion of the wall.

 

[camarotoolman]

Tap cons, into the blocks on 16"centers. I built a lolf in a rental unit like that. Never had a problem, customer stored some heavy stuff up there too.

 

[danski0224]

Easier to do this: http://www.garagejournal.com/forum/showpost.php?p=2486975&postcount=8

 

[OccupantRJ]

Unless it is detrimental to your situation, I think several posts under the ledger might be a good idea, then the anchors holding the ledger to the block wall just have to avoid pulling away from the wall, reducing the amount of load they experience. Depending on the situation, holes can be drilled completely through the block, then the ledger can be attached with bolts or threaded rod. B7 is a stronger version of threaded rod, and is available at McMaster Carr.

 

[premierplayer]

Thru bolt, not that you are trying to meet codes, but it is the only approved method here in MD. If at all possable drill at mortar joints to lessen the chance of blowing out the back side of the block when the bit exits. Link above has some good information.

 

[theoldwizard1]

Unless it is detrimental to your situation, I think several posts under the ledger might be a good idea, ...

"Posts"/studs are the best solution for a heavy load.

Tapcons just made the block crumble.

Reg Head hollow wall fasteners worked for me, but I don't know how much of a load they would support.

 

[Daniel Dudley]

Seems like I did this a few years ago. They were planning on using the space for heavy storage. I think I built stud walls on the inside of the block. You could post, or use 2x4s on the flat, shot into the walls. The quality of block seems to vary greatly, so don't screw around.

 

[mrb]

I am thinking to build a stud wall to bear the weight, and bolt through the block in a couple places to keep the assembly from being able to pull away from the block wall. Its not that large, whole thing is probably 8 or 9 feet wide.

 

[RivennHewn]

Simpson Strong-Tie, or Hilti both have epoxy for anchoring all thread into un-grouted cells.

they use a screen tube to hole the epoxy around the threaded rod, and block wall.

http://www.strongtie.com/products/anchorsystems/adhesives/accs/opti-mesh.html

 

[RKA]

Simpson Strong-Tie, or Hilti both have epoxy for anchoring all thread into un-grouted cells.

they use a screen tube to hole the epoxy around the threaded rod, and block wall.

http://www.strongtie.com/products/anchorsystems/adhesives/accs/opti-mesh.html

I used three hilti anchors to hold the support bracket for a 140 lb AC condensor. Expensive, but nice product and it worked well in hollow block (first time I've used epoxy anchors). Make sure you follow their torque recommendations. I think mine was 3/8 inch threaded rod and called for 6 ft lbs on the nuts.

 

[claymont]

I like toggle bolts through the hollow faces of block and tapcons into the solid web of the block.

I am thinking to build a stud wall to bear the weight, and bolt through the block in a couple places to keep the assembly from being able to pull away from the block wall. Its not that large, whole thing is probably 8 or 9 feet wide.