there are several ways to attach a pergola to a deck but they all depend on the size of your pergola and the construction of your deck. if possible, a pergola anchored to a footing is best. cutting out the deck to allow the pergola posts to reach
from what youve said so far, im guessing you have built a deck free standing, ie you put posts in, rather than connecting to house with a ledger?? will the proposed pergola have a roof (metal/polycarbonate) on it? will you be attaching the opposite side of the pergola to the house fascia?
it is very important to properly attach pergola posts when installing a pergola over a deck. the main concern is how the structure will react under high wind conditions. most deck builders bolt pergola support posts to the frame of the deck using (2) 1/2" x 6" lag screws with washers per post. this technique is the same as attaching a rail post.
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any pergola post can be anchored to a wood surface with 90 degree strap brackets. there are a few additional considerations before screwing into the post and into the deck. first, be sure you are screwing into the deck’s beams, not the deck’s boards.
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