Crpntrfrk s got it put a footing under each post.
Footing depth for pergola.
How to pour concrete footings for a cedar pergola.
Three options for footings are discussed.
The easiest method of installation is to dig footings to the correct depth below the frost line in your area and use post mounting hardware to attach the posts to the concrete footings or existing concrete slab as follows.
2 3 bags of ready mix concrete per form.
This do it yourself video will teach you how to pour concrete into a sonotube form measure and place post mount brackets for your pergola kit.
Pros and cons given for each.
Order the 8 foot or 10 foot post option and add the post attachment hardware to your order.
Footings are also useful if you wish to install your pergola or pavilion over an existing paver patio.
If for example each post is 12 feet tall.
Footings should extend to a minimum depth of 12 inches below previously undisturbed soil.
Other tools and material you will need.
All structures need to be anchored to concrete footers.
Fortunately there are some excellent ways of installing footings for a pergola that are strong stable and durable without the need to dig mix and pour cement.
Especially where reactive soil is a concern you should consult with your local council on.
Pergola footings without digging.
8 x 3 or 4ft diameter sonotube form.
The footings for your deck or pergola will serve as the cornerstones of your support structure.
Dig holes in the locations for the pergola s posts making each hole at least 12 inches in diameter and the depth of one third the height of one post.
Pergola post installation mounted on concrete footer or existing slab.
Footings also must extend at least 12 inches below the frost line the depth to which the ground freezes in winter or must be frost protected.
Footings should have a minimum width of 12 inches.
Select the right footing for your next pergola or arbor project.
Bet you thought it wasn t possible to build pergola footings without digging and setting the posts into the ground.