Hi Casey,

OPC is "ordinary portland cement." It is the base material in virtual all cement used globally today with very little semblance to the traditional natural cement that built this nation...like the cement foundations for the Stautue of Liberty, Brooklyn Bridge, etc. OPC are adulterated materials that have all types of additives (mostly industrial waste byproduct) is part of the reason they tend to fall apart after just a few decades, unlike the natural cement which has lasted millennia.

I do like infill system for timber frames, yet this is often not practical for contemporary versions of them. I don't care for stress skin panels either for a number of reasons related to access, and serviceability.

What we, and many others are, turning to is Wall and Roof Truss systems that facilitate the deeper walls found in many old structures that form wonderful window seats, as well as, give assess to updating mechanical and electrical needs, while also offer more than adequate methods of insulating. There we have switched to things like straw bale, clay slip, mineral wool, etc.