by the way, a pergola is merely a shade structure. what you're talking about is a freestanding roof. since your posts will be top mounted, be sure to run knee bracing in both lateral directions and don't skimp on the fasteners the wind will wreak havoc on such a structure if it's not built right.
i would do a typical footing required for your area set the anchor bolt with a post base bracket and trim out the base or make a nice decorative base collar. here is a quick sample.
how to install pergola post brackets. also, check your zone for the freeze depth to determine how deep your concrete support needs to be. in our zone, this is 30 deep. use a hand saw to cut the 12 concrete form to size. place the form into your dug hole. run strings as needed to determine the placement and/or alignment of your post,
post mounting hardware. if you will be installing your pergola on a concrete patio or concrete footings, choose concrete anchor. if you are installing on top of a wood deck choose wood lag. the 6×6 bases can be used on the big kahuna pergola kit and sombrero pergola kit, and the 4×4 bases can be used on the fedora pergola kit.
on the pergola, since it's attached to the house, the house is acting as shear resistance on 3 sides of your pergola, but the front is the weak spot, as you've found out. some potential options: sink the front two posts into the ground several feet and surround with concrete typically you'd want 1/3 of the post in the ground
when you anchor the posts, take into consideration the strength youll need to keep the pergola upright and resistant to natures forces. winds, snows and ice can ruin a poorly built structure. use lag bolts to anchor the posts to the deck and within the anchor itself. here is a link to the anchors i chose.
this diy step by step article is about how to anchor post to concrete. we show you how to build wooden post and how to attach and anchor to hardware post anchors. . read it. how to anchor post to concrete howtospecialist - how to build, step by step diy plans there are lots of do it yourself pergola kits available to you so that anyone
if you want your pergola positioned over a patio or concrete choose the second option as the fixing post is secured by using a hammer drill and masonry bit to drill through the hard surface and then secured using the special masonry bolts provided. if your soil is of a poor constituency you should go for the final option.
pergola posts - bury or just attach to concrete footings looking at building a free standing pergola using 6 x 6 posts. so much conflicting information out there about whether it is better to bury the posts in concrete or pour a concrete footing with the post anchor imbedded.