Building a large lean to - timber setup?

Basically I want to build a large lean to structure coming off the back of my house.

Rough dimensions will be 5000 x 5000 give or take.

I am going to resin anchor a wall plate to the back of the house at the required height. I will then set 2 large posts (6 x 6 or maybe bigger), at the required distance away from the house. I will obviously have another timber set on to these posts to create the other plate.

The roof timbers will then be cut to sit on top of both plates, with a birds mouth on the end away from the house. These will be fixed in place with 2 90mm nails at each end going in at an angle. Will that be sufficient to hold the timbers in place? Or will I need some form of bracketry? As I'm worried about wind lift etc. The roof will just be polycarbonate sheeting.

Also, is it possible to sit the 2 6x6 posts on a brick pier, with some form of bracket / bolt fixing them in place? Or will they have to be set at least 1000 in to the ground with plenty of ballast? As there are no walls and it is a completely open structure, the only way I can see that it can be done is by having the posts solid in the ground, so there is no movement whatsoever.

Cheers

 

That feels flimsy and wrong.

You could have the posts set into brick piers, possibly?

 

You will need to reconsider your construction given the size of your building. 2 posts on the front will need a 10" x 4" minimum timber to span the 5000mm + minimum 10" x 2" rafters. You need to consider possible snow load and the span of polycarb sheets. In short, you need a structural engineer to design an open roof of this size.

 

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