Loading

How To Build an Octagon Deck

The most important thing to be concerned with while building an octagon deck is to keep it level and square. We recommend to start by setting the prenotched posts at each corner positioned at a 22.5 degree angle. Between each of these posts, you will install double flush beams. Make sure each beam is the same length and equidistant to the opposite side. 

Octagon
PinterestSave


The perimeter framing will be flexible for you to adjust before adding additional framing. Use temporary supports to stabilize the frame while working. Once the deck perimeter is square and level, install joists using angled joist hangers to strengthen the octagon frame. Avoid installing joists to the corner intersections to prevent interfering with the post beam notch connections. Adding decking and bracing will improve the strength and structural stability of the octagon. 

If you are planning on installing a gazebo on top of the octagon, make sure your footings are sized to support the extra weight of the roof and that the gazebo is properly attached to the frame.


Popular Framing Articles
Deck Support Columns

How to Decorate Deck Support Columns

Browse some examples of decorative deck support posts for tall decks.

Deck Framing

Anatomy of a Deck

Anatomy of a Deck

Deck Framing

Deck Floor Joists

Step-by-step instructions and tips on how to frame. Learn how to install treated wood joists and beams to build a strong deck.

Next Step: Decking Articles
Decking Installation

Decking Patterns

Installing your decking at a 45-degree angle is a popular style for decks. This can be done to reduce decking seams or just for appearance.

Decking Installation

10 Common Deck Building Mistakes & How to Avoid Them

Building a deck can be a complicated process. Learn how to avoid falling into common deck building pitfalls with tips and advice from the experts at Decks.com.

Decking Installation

Installing Composite Decking

Learn about how to install composite decking. Topics include expansion and contraction issues and hidden fastener systems.

Get more helpful resources delivered right to your inbox

Explore Articles by Topic

Deck Framing

How To Build an Octagon Deck

The most important thing to be concerned with while building an octagon deck is to keep it level and square. We recommend to start by setting the prenotched posts at each corner positioned at a 22.5 degree angle. Between each of these posts, you will install double flush beams. Make sure each beam is the same length and equidistant to the opposite side. 

PinterestSave


The perimeter framing will be flexible for you to adjust before adding additional framing. Use temporary supports to stabilize the frame while working. Once the deck perimeter is square and level, install joists using angled joist hangers to strengthen the octagon frame. Avoid installing joists to the corner intersections to prevent interfering with the post beam notch connections. Adding decking and bracing will improve the strength and structural stability of the octagon. 

If you are planning on installing a gazebo on top of the octagon, make sure your footings are sized to support the extra weight of the roof and that the gazebo is properly attached to the frame.


Popular Framing Articles
Deck Support Columns

How to Decorate Deck Support Columns

Browse some examples of decorative deck support posts for tall decks.

Deck Framing

Building a Round or Curved Deck

Learn how to build a curved deck using standard wood-framing materials. Composite decking material is more flexible for curved decks than wood.

Deck Framing

How To Build an Octagon Deck

Learn how to build an octagon-shaped deck. Octagon decks can be used as the floor for a gazebo roof.

Next Step: Decking Articles
Decking Installation

Decking Patterns

Installing your decking at a 45-degree angle is a popular style for decks. This can be done to reduce decking seams or just for appearance.

Decking Installation

Tile decking

Installing tile over a standard deck frame in an exterior environment is a recipe for trouble.

Decking Installation

Decking Patterns

Installing your decking at a 45-degree angle is a popular style for decks. This can be done to reduce decking seams or just for appearance.

Get more helpful resources delivered right to your inbox

Explore Articles by Topic