12x12 pavilion!?

6/4/2020 at 11:05:22 AM

Dealing with overhead structures especially one that big Solid anchoring period. You have to consider wind forces and lateral forces. There's nothing worse than building something that eventually fails causing property damage and bodily harm. My suggestion is set the posts in concrete. There are no shortcuts to that type of build.

Cheers,

Rez

6/4/2020 at 4:08:04 PM

Hi,

Always go down 4' with sono tubes and concrete. Even if its just a small low deck.

But just as fences will have windage it will be more pronounced with the structure you describe. So yes, go the sono tube and cement route.

6/4/2020 at 6:06:12 PM

This project requires a building permit which means your solution will have to satisfy the local authority.Anytime structural supports are over 24" on center the structure is supposed to be engineered unless you are granted an exception.

There are also requirements spelled out in the Code regarding anchorage which you will have to follow (or engineered alternative). If you were to have a lattice instead of a full roof then permits should not be required however that still doesn't excuse you from meeting minimum Code.

6/4/2020 at 6:34:43 PM

Thanks for the info Ian but that was not what I was asking

6/5/2020 at 5:50:04 PM

Sorry if I didn't correctly respond to your question; with some luck my 2nd try will be the charm? As I read it again I see you asking about helical screw piles or attaching it to the existing deck.

Both of these scenarios are not described in Part 9 of the Building Code which means that engineering is required for both, so ONLY an engineer can answer your question and design a solution after looking at all of the many mitigating factors.

Sorry if this isn't the answer you were looking for. Typically contractors who do the screw pilings are able to provide the required engineering (at least in Alberta anyway); however the connection and anchorage between the screw piling and the pavilion structure again requires engineering