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Plan Types For Purchase
How to Build an Octagonal Deck
Step 7: Position remaining Dek-Block® Piers.
Using the frame as a guide, position the remaining Dek-Block® piers directly beneath the frame using the dimensions provided on the plan. The blocks to the outside of the deck should be 12 inches in from each end.
Go down each row measuring the distance between the 2"x6" support board and the Dek-Block® pier. Cut 4"x4" posts to length and position between the support board and the Dek-Block® pier. Repeat until all 4"x4" posts are cut and positioned. Secure all support boards and 4"x4" posts using two 2 1/2" deck screws at an angle (toe-screw) from each side.
Don't get caught up in the small dimensions. You want to position the blocks accurately, but there's no need to be exact. There is a lot of "play" in the spacing between the piers. As long as you don't exceed 5 ft. between blocks, the deck will be fine. It's fine to have one row spaced at 3 ft. 10 inches from the one block and 4 ft. 2 inches from the other block. However, the deck will look better if all the piers are aligned in a straight row.
This is a great job for 2 people. Have one person measure the height for the 4"x4" post and another person cut the post. Go down the rows measuring and cutting all of the posts, then place all the posts at the same time. This may require lifting the frame up slightly in order to get the post under the support board.
If you are building by yourself, go down the rows measuring the height for the 4"x4" posts. Write the measurement on a piece of paper and on the side of the support board. Cut all the 4"x4" posts at once and then position.