Concrete anchor bolt loading with standoff

[ewans]

Hoping you can help me with a simple bolt load question.

I have a poured-concrete foundation wall covered with 2" rigid foam insulation (extruded polystyrene), and I need to anchor a 4'x4' plywood panel to the wall. Approximately 250lbs of heating equipment will be mounted to the plywood panel. I recognize that, due to the 2" foam 'standoff', using concrete sleeve anchors or Tapcon-type fasteners to attach the panel to the wall will result in applied bending loads on the fasteners.

My proposed approach is to use rigid spacers or sleeves between the concrete wall and the backside of the panel at each fastener location. Assuming the spacers are rigid with minimal bolt clearance and the anchors can be sufficiently pre-loaded, will this approach eliminate the applied bending loads and result in simple shear and tensile loads on the fasteners?

Please advise if I have not chosen the appropriate forum in which to post.
Thanks in advance.

 

[Tmoose]

The standoffs might need to be kind of large diameter. I'd look at screwing two verical studs to the wall, with the ends ends resting on the floor, or hung from the ceiling.

I think most codes frown on exposed insulation.

 

[ewans]

Tmoose,
Thanks for the suggestion... appreciated.
The code in my jurisdiction does similarly not allow exposed insulation. I have non-structural steel framing with drywall in front of the insulation everywhere except the 4'x4' section in question.

Regards.