If local codes allow setting the overhead directly on an existing slab but the concrete is not thick enough to support the overhead's weight, you will have to pour new footings around the slab's perimeter or break To secure an overhead to an already-existing slab, you must place each post in a post anchor.
Product Info. These anchors are used for locating 90mm, 100mm, 115mm and 125mm posts onto existing concrete or decking. They have a knockout, 3mm thick, adjustable washer to facilitate position adjustment after anchor holes have been drilled into the concrete or timber floor and the connector installed.
There will be a few places where I'll have to mount the posts to the existing concrete. the post with vinyl, you could weld 3.5" square x 1/8" wall steel tube to a base plate and bolt the base plate to the concrete with really good anchors. . Wood will expand and contract with the seasons and the rain.
The ultimate how to guide for properly mounting pergolas to any surface, including decks, paving stones, poured concrete, and more. Wood over time can bend, bow and twist with the seasons and the frost. With proper Any pergola post can be anchored to a wood surface with 90 degree strap brackets.
Going into concrete? The Titan Wood Post Anchor is a great solution for securing your 4x4 or 6x6 wood posts. We recommend using a 3-1/2" Caliburn XL .. great idea. don't have mine up yet, still waiting on my carpenter to show, but am going to use to mount 6x6 on top of my existing deck so I can cover to keep the rain
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