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.
Deck Skirting and Fascia
Skirting can be an attractive feature that can be added to any low-level deck.
Eco-Friendly Backyard: Tips and Ideas to Green Up Your Space
Living a more sustainable lifestyle can start with a few simple changes in your backyard. Learn how to create a more sustainable backyard with Decks.com.
Benches
Adding built-in benches can save a lot of space on your deck and give your guests a comfortable place to sit. Learn how to easily build a bench with Decks.com.
10 Tips For Designing A Great Deck
This is an introduction to design. Start here to get some fresh ideas before designing your dream deck this year.
Leftover Deck Board Ideas
Have leftover deck boards after building your deck and don’t know what to do with them? Get inspired with 10 ideas for leftover decking from Decks.com.
5 Ways to Use Your Deck In The Winter
Hoping to get use out of your deck all year long? Discover these helpful deck ideas to keep your deck warm and cozy in cold winter weather at Decks.com.
More Helpful Resources
Explore Articles by Topic
Footings
Information related to installing frost footings for decks
Framing
Learn structural framing methods
Decking
Learn about wood and composite decking materials
Stairs
An in-depth look at the complex issue of how to build stairs
Railings
How to install guardrails and handrails to meet IRC code
Features
An overview on water drainage, benches, planters and lights
Design
The basics of deck design
Planning
Learn about permits and working with contractors
Porches & Patios
Build a covered deck to enjoy all seasons
Ledger
Proper attachment techniques
Care
Maintain your deck to maintain your investment
Materials
An overview on water drainage, benches, planters and lights
Deck Skirting Ideas
Deck skirting offers more than aesthetics. From added storage to critter deterrence and concealing structures, explore our top ideas for your backyard's transformation.
The Top 10 Outdoor Fireplaces for 2024
Outdoor fireplaces can make your deck or patio cozy year round. Get our recommendations for how to choose the best outdoor fireplace.
Deck Bar Ideas to Get Your Backyard Ready for Summer
Want to transform your backyard into the perfect space for entertaining? Check out our outdoor deck bar ideas!
10 Fence Ideas to Add Privacy and Style to Your Yard
10 Fence Ideas to Add Privacy and Style to Your Yard
Zipper or Hearing Bone Decking
Learn how to install a herringbone zigzag decking design by installing blocking to the deck frame.
Brown Composite Decking
Get inspired by our collection of brown composite decking ideas and images. Find the best brown deck designs to fit your home and personal style with Decks.com.
Explore Articles by Topic
Footings
Information related to installing frost footings for decks
Framing
Learn structural framing methods
Decking
Learn about wood and composite decking materials
Stairs
An in-depth look at the complex issue of how to build stairs
Railings
How to install guardrails and handrails to meet IRC code
Features
An overview on water drainage, benches, planters and lights
Design
The basics of deck design
Planning
Learn about permits and working with contractors
Porches & Patios
Build a covered deck to enjoy all seasons
Ledger
Proper attachment techniques
Care
Maintain your deck to maintain your investment
Materials
An overview on water drainage, benches, planters and lights