Tie existing CMU wall to existing floor diaphragm without entering house (aka Houdini)

[Ben29]

I am working with an end-unit townhouse (circa 1984) that was demolished. The 8" CMU block firewall remains intact. The demolished townhouse will not be rebuilt. The existing firewall will remain and will become the new "exterior wall".

I have access to the original drawings for the townhomes but they don't give any indication that the wall is reinforced or grouted. There are no details for break away connections to the floor joist or roof trusses. So I believe this wall is a freestanding wall with no anchorage.

Does anyone have an idea of how to tie the CMU wall to the second floor and roof diaphragm without entering the house?

 

[phamENG]

Not happening. You have to make connections. You can't connect to something that you can't touch...

 

[Celt83]

Helifix Bowtie anchors. Link

but your really going to need interior access to install some proper blocking in the floor and roof to anchor to.

 

[XR250]

Drill Holes and use 3/8"Ø lags with plate washers?

 

[Ben29]

agree, agree. Thank you.

 

[Aesur]

Simple - Install permanent exterior wall braces in the adjacent property owned by I assume others that "sandwich" the floor and roof between the exterior walls each end... In all seriousness though, I don't see any feasible approach here without access.