Zk- In the picture it says and it shows you need to cut out the foam where the roof deck meets the wall so there is thermal bridging through the concrete as expected. Your deck sits directly on the concrete walls, there is no foam in between.

Hey Pacificstart: Sorry, I just found the photo as an example (I didn’t look at it very closely). However, you don’t need to cut out the foam where the roof deck meets the wall (in order to prevent thermal bridging). Of course, the rebars from the walls would need to go through the roof deck ICF, therefore having a cut out (in roof deck ICFs) would make placing them simpler, but you can fill the cut out with foam insulation before placing the concrete. As you can see from this photo, you will have Thermal bridging, however, I was trying to say that if you extend the roof deck ICF all the way to the edge of the outside wall (and utilize fiberglass rebars), then the concrete on the roof will not be touching the concrete inside the walls, and you will not have thermal bridging. http://buildblock.com/wp-content/uploads/BuildClip-BuildDeck-Annotated-Assembly-web.jpg

This is the first time I heard of supporting a concrete deck on a foam layer on top of the walls. Do you have examples where this design has been used and tested before?
Has a structural engineer approved this design?
I see the following issues with it:
1- What happens if there is a fire or some solvent leak that melts the foam between the deck and the wall?
2 - The deck usually has also a diaphragm role to stabilize the structure in case of a seismic event.
3 - In case of a dynamic load applied to the roof/deck (hurricane, earthquake) I am thinking the FG rebar may give up since the desck is pretty much floating on the layer of foam.

Vapor Lock 2020 is made by spg - I used it in all the concrete. I did cut out the foam where the wall met the concrete roof, however I put a layer of load bearing expanded glass (don't remember the name) with holes in it for the fiberglass rebar. Not sure how to add a picture.

Vapor Lock 2020 is made by spg - I used it in all the concrete. I did cut out the foam where the wall met the concrete roof, however I put a layer of load bearing expanded glass (don't remember the name) with holes in it for the fiberglass rebar. Not sure how to add a picture.

I was also concerned about how the thick edge would look so I added a 1x6 into the form - this also worked for putting the spouting on the back.

Hey Pacificstart: This is the first time I heard of supporting a concrete deck on a foam layer on top of the walls. Do you have examples where this design has been used and tested before? Has a structural engineer approved this design? The concrete roof deck is supported by rebars (on top of the roof) embedded in concrete (designed by a structural engineer) and/or c-channels inside the ICF themselves. These rebars are also connected to the rebars in the walls (or via fiberglass rebars). If you are asking whether EPS foam layer on top of the wall can withstand the pressure from three inches of concrete on top of the roof, then see this document. EPS is used as a structural fill under roads. http://www.civil.utah.edu/~bartlett/Geofoam/48a%20-%2040%20years%20of%20experience%20final%202011-05-26.pdf What happens if there is a fire or some solvent leak that melts the foam between the deck and the wall? If you melt the foam (somehow), then again, there are rebars embedded in the roof and connected to the rebars in the walls, every foot or so, based on the design.