None personally, Just administering construction projects. I've seen everything from summer and winter installations of CIP to slurry walls, precaste, pre-stressed and most everything in between.
I've been looking at hypertufa for a while now for some home projects and hands on experience can't be beat. I've not seen a project as crisp in design yet weathered in appearance as yours. I like it. The overall feel I get is of an older limestone building which has just been cleaned. We saw a lot of that while I was living in Boston.
Is it possible to introduce things like small shells into the mix?
