Residential PSF Deck Requirements
For a residential deck, the code requires it be designed to support a minimum 40-psf live load. The live load is the external force applied to a deck due to the activities of its use. People, furniture and any other movable, physical objects on the deck are covered under live load. In commercial buildings, the minimum live load required by the International Building Code is determined by the anticipated use of each space, and thus, the anticipated density of people in the space. For assembly uses, such as restaurants, churches and music venues, the minimum live load is 100 psf. Conventional deck construction can support greater live loads by using larger dimension lumber or closer spacing of joists and beams. For residential decks designed for entertaining large groups, it’s not a bad idea to overbuild it from the minimum 40 psf required by building codes.
In regions with heavy snowfall, the snow load may exceed the 40-psf live load. In those instances, allowable spans for larger live loads can substitute for an equivalent snow load. For example, a span table for 60-psf live load could be used for a region with a 60-psf snow load. Some conditions may require additional design consideration, such as areas subject to drifting snow or sliding snow from roofs above. Those loads act on the deck differently and more substantially than live loads.
IRC Code Requirements For Decks
Residential properties have certain code requirements that must be met before building a deck known as the IRC. Learn more about IRC building codes for decks at Decks.com!
IBC Requirements For Decks
The International Building Code (IBC) regulates deck additions attached to commercial buildings. Learn how IBC requirements may affect your project at Decks.com.
Building A Deck Over A Septic Tank
Building a deck on or near a septic tank is not the best idea and can result in a damaged or punctured tank. Learn more about building near a septic tank at Decks.com.
How to Build a Patio With Stone or Brick Pavers
Planning and installing a DIY brick or stone paver patio is a big project. Learn how to build a paver patio from start to finish here.
Our Favorite Porch Ideas & Designs for 2025
Looking for inspiration for your porch? Whether it’s a front, back or enclosed porch, we have ideas, designs and photos for you. Get inspired at Decks.com.
How to Build a Porch: Steps for Building a Front Porch Deck
Building a porch can be challenging, but allows you to enjoy your outdoor space year round.Learn the basics about building a porch roof over a deck at Decks.com.
More Helpful Resources
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IRC Code Requirements For Decks
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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