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.
The 8 Best Deck Paints for 2024
Painting your deck is a great way to refresh your outdoor space. Get our recommendations for how to choose the best deck paint today.
The Best Outdoor Lights for Your Backyard & Deck
Adding lighting to your deck or patio is important for both style and function. Check out our recommendations for the best outdoor lights to illuminate your backyard.
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.
Deck & Patio Landscaping Ideas
Looking for landscaping inspiration and ideas? Check out our ideas for turning your patio or deck into a beautiful oasis for entertaining and relaxing.
Selecting The Best Composite Decking Color For Your Home
There are many composite decking color options. How do you select the right one for you?
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.
What Does it Cost to Enclose a Deck?
Want to enclose your deck but wondering how much it costs? Learn the cost to enclose your deck, porch, or patio to enjoy it all year round.
The Best Deck Styles for Every Part of the Country
Deck taste and styles in the US differ across the country. Check out these popular looks from every region.
Grey Composite Decking
Get inspired by our collection of grey composite decking ideas and images. Find the best grey deck designs to fit your home and personal style with Decks.com.
Budget - Determines Deck Size and Materials
Some tips for designing a deck to fit your budget.
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