I build a lot of decks,deck covers and pergolas. I would make sure your post are in the ground at least 30” or more depending on the height of the pergola ,with a concrete pad under the post before you poor concrete around them.
In this project, our pergola will be built at the corners of an existing retaining wall; however, the pergola build process is the same with or without the wall in the design. To dig the post holes, you can use a clamshell digger, power auger or a shovel.
Building a pergola on top of a deck is a bit more complex than building directly on the ground. When you build on the ground, you can bury your posts in the ground and use gravel, dirt, or concrete to give them more stability.
The existing deck is only maybe 3 feet off the ground at the highest point. Can I build a freestanding pergola on top of the existing deck, or attached to the floor joists or something like that? I dont want to attach it to the house, and I dont really want to have to dig footers for it.
Make your deck feel like an outdoor room with this easy-to-customize pergola. Cables and exposed bolts add an up-to-date flair and places to hang plants. These instructions and the project diagram will help you build a pergola similar to the one shown that was created for a 12-ft x 14-ft deck. Use ...
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Many of our standard pergolas work well with various patios, landscapes and decks. If you are interested in a custom size or design, please email a layout or drawing of your backyard/project to melamishgazebos.com.
A pergola can be a free standing structure or you can construct one that attaches to the side of your house. Building an attached pergola, 16 feet by 20 feet, on your deck can be done by first determining if your deck is big enough for this size of pergola.
Pour the pergola footings before you build the deck, and have them inside of the deck beam -- closer to the house than the deck beam. Lay out the deck joists so that none are in the way of getting to the pergola footings.
Its also unreasonable to dig to add external posts outside the deck area. e.g. build a posted pergola bigger and around my deck. The below pics don't show it great, but there is good room for a 8'x8' free standing roof/pergola at the end of the deck.