So it sounds like the styrofoam will be strong enough to support my entry arches . I just didn't want to build it and have the arch "shift" while it was drying.
I agree. My plan was to cut them out.
TIP: I used an old "electic turkey carver" (actually a new one that we got as a wedding present 8 years ago but never used it
) with the two blades to cut the styrofoam.
Thanks
Dick