Hi Mark,

Welcome to the Guild Forum...

First feel free to send me an email if you would like.

It reads to me that you have already gone the route of a modern concrete foundation, with a brick floor to facilitate it being a "Smithy Shop" so my normal recommendation of just a traditional stone foundation is moot. The only foundation we place most of our timber frames on is a traditional stone one in almost all project both commercial/public and private/domestic...just as it always has been.

Anyway, what you are planing sounds just fine as I am reading it? There typically is no need to "attache" the timber frame to the concrete at all unless you wish it to be that way. Historically (and still today in most instances of traditionally built frames) they just "sit" on there foundations without any issue at all.

I can expand on any of this more if you so desire, or have other questions...

Regards and again Welcome!

j