Posted By Alton on 01 Mar 2012 02:58 PM
That question can not be answered very easily without knowing the exact detailing in each wall and then the answer should come from a structural engineer that is very familiar with both systems. Both systems readily lend themselves to reinforcing steel (rebar).
Shotcreting and gunite are just different ways of placing concrete. But the method of placement can affect strength. For example, not vibrating CIP walls can result in voids which can reduce strength. SCIP walls do not need vibrating since the method of delivery and troweling compacts the mix.
Each brand of SCIP has its own specifications, that is, size and spacing of wire trusses and wire mesh. Size and spacing of the wire members can greatly determine how much composite action results in the SCIP shotcreted panel. The various brands of SCIPs that I have seen would still not generate as much composite action as a cast-in-place (CIP) wall with the EASI-Wall insert nor would they have as good an R-value with the same amount of EPS. But in my opinion, the differences would not be that much.
In summary, I would not hesitate to use either CIP, ICF or SCIP provided the systems were engineered to meet the strength requirements. Based upon recent quotes for my area for various systems, it appears that SCIP walls will cost less than CIP and ICF for a finished wall, that is, a wall with stucco exterior and plaster interior.
At the present time, I think there are more CIP and ICF installers available than SCIP installers. In other words, in some areas homeowners can not consider SCIP at all. I think we need more companies such as Envirolast that furnishes all materials and labor for a turnkey job.
Alton - I wish more people would look at the different concrete models like that! Each method has their pros and cons, some are better in some climatic conditions then others but it is important that the end user assess the value of the product for their particular situation. 'couse I think any of the three is better than wood or cmu. But thats my bias!