Loading

How to Build a Pergola on a Deck

A pergola is a structure built to provide overhead shade. It is usually supported on four sides by vertical posts that hold in place a lattice of wooden members. Some pergolas are attached to the house at one side with a ledger board. If you plan to do this, make sure you take all the same precautions to maintain a watertight connection using flashing and caulking. The sizes of the overhead members can vary, but the lowest boards in the assembly will be the heaviest. Beams attached to posts will support one or more layers of cross members. The spacing and size of these members or louvers will dictate the amount of sunlight that is allowed to penetrate and the visual mass of the structure. Sometimes vines are trained to grow through the latticework to provide a lush natural canopy. 

Pergolas and other overhead structures are subject to building codes. While intended only for shade, these structures often support hanging swings. Depending on the design, slats overhead intended for shade may be close enough to support bridging snow. Due to the structure of some snowflakes, snow is able to bridge over gaps as big as 4 inches or more. Snow piling up on a pergola likens it to that of a roof. Even without snow bridging possibilities, many building authorities will assign a minimum 20 psf live load for the structure to support. 

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. Pergolas are top heavy. Without lateral bracing, they can sway in the wind and experience strong uplift forces as the pergola acts as a sail. Attaching sections of rail in between pergola posts will strengthen the pergola. Installing 45-degree bracing in between the post and header beam also will increase stability. Using 6x6s for support posts will further strengthen the structure.

Pergola
PinterestSave
Pergola

Here is an example of a shade pergola built over a deck.

Popular Features Articles
Benches, Planters & Skirting

Deck Skirting

Skirting can be an attractive feature that can be added to any low-level deck.

Outdoor Ideas

Deck Stain Color Ideas & Inspiration

Choosing a stain color for your deck can feel overwhelming. Get inspired with deck stain color ideas and options.

Building

How to Build an Outdoor Table Yourself

Our DIY guide will show you how to build an outdoor table to entertain guests and make the most out of your deck or patio. Learn more with Decks.com.

Next Step: Design Articles
How to Design a Deck

Decking Patterns

Step into the world of deck design and push the limits of your imagination with our collection of deck patterns and ideas. From classic single-width and diagonal layouts to intricate herringbone and chevron designs, we illustrate the wide range of patterns that will unlock your creativity.

How to Design a Deck

Best House and Deck Color Combinations

Whether you’re adding a deck to your home, repainting your deck, or refreshing the exterior of your home, it’s important to consider all the different design choices you have available to you, so you can choose one that makes your neighbors do a double take (in a good way!)

How to Design a Deck

Deck Size

Whether remodeling an existing deck or adding a new one to your home, size is one of the most important design elements to consider.

Get more helpful resources delivered right to your inbox

Explore Articles by Topic

Popular Features Articles
Outdoor Ideas

5 Best Ways on How to Hide Trash Cans Outside

Outdoor trash cans can be an unwanted eyesore. Discover how you can easily cover them up and add an extra touch of beauty to your yard.

Building

Covered Deck Costs

Interested in a covered deck but asking yourself how much it costs? Learn the cost to build a covered deck depending on types of deck covers and add-ons.

Outdoor Ideas

Outdoor Water Features to Enhance Your Space

Looking to add a water feature to your backyard or patio? Check out our top ideas to add some tranquility to your outdoor space.

Next Step: Design Articles
Pool Decks

Pool Deck Ideas on a Budget

A stylish poolside retreat doesn't have to come with an over-the-top price tag. Allow us to show you some easy and innovative ways to build a stunning pool deck that won't empty your wallet.

How to Design a Deck

How to Build a Raised Deck

Building a raised deck can be a great option for some homeowners. Learn how to build a deck that is elevated above ground level with this guide from Decks.com.

How to Design a Deck

DIY Deck Remodel & Renovation Ideas

There are lots of reasons to remodel your deck and lots of ways to do it. If your worn-out wood decking needs replacing anyway, give low-maintenance composite deck boards a try.

Get more helpful resources delivered right to your inbox

Explore Articles by Topic