how to build pergolas on existing decks pt.1 when you want to add a pergola an existing deck the first consideration is whether the deck will support the additional weight. aesthetics is the second concern.
9 answers. replace the corner and center railing post with the pergola post using through bolts. the weight of the pergola will only be the weight of the material itself. if you would like, you could add angle brackets underneath the deck where the deck joist and the band board meet to increase the sheer strength of the band board fasteners.
step 7. attach two of the 20 foot 1-by-6 boards to each of the 4-by-4 pergola posts for the side beams. place the first two boards on the left and right side of one of the 4-by-4 posts. repeat this process for the other 4-by-4 post.
step 4. attach the panels one at a time using screws. start on the left side and work your way across the roof. by doing so, it will ensure that the panels line up. the panels should overlap each other slightly.
others might have a different view, but just looking at that deck i'd be inclined to make the pergola/roof freestanding and not try attaching it. a fairly simple set of new holes with stirrups or even screw anchors and posts with beams and then rafters.
extend your space with a pergola. if you already have a deck or patio, one of the reasons you probably added it was to extend your outdoor living space. if youve been enjoying it, you might have found that during particular weather extremes it becomes uncomfortable to use. a pergola allows you to use your deck no matter what the weather is doing.
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my experience: we added a pergola to our concrete patio using a kit purchased from costco. the kit included instructions for both concrete and wood installation. the instructions were available online without purchasing and stated what additional items needed to be purchased depending on the type of ground concrete, wood you plan on installing the pergola over as well as attaching to another structure.
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