Post and beam screened porch and sunroom addition

Hello,

My cabin project is the the back burner while I am dealing with the ministry of transportation expropriating part of my land. I decided to go ahead and build a screened porch and sun room addition to my cabin I currently use .

I am looking for ideas how to go about this. One of the issue is the foundation, I am on black shale and I am not sure if I should dig to 48 ( frost line ) for concrete piers. I don't how I can do that, and I don't think screwed piles would work on shale.

I am thinking of having dimension of about 16 x 12, with part of it screened sun room ( more like a view room since it will face north, where the view is).

How to make an internal division will be an issue, but its a cold area and would like a three season usage, only screened porch is not an option.

I welcome suggestions.

Serge

As to the footing depth, if the shale is above the frostline, could you drill into it and epoxy some rebars into the drilled hole?
Just a note: I am not an Engineer.

Thank you, sounds like a very good idea, maybe I could then pour concrete piers with the rebars.