Deck girders & beams guide:

This article reviews the proper construction and connection of beams or girders used to support a deck or porch.

Deck & Porch Support Beams

Our page top photo shows an unsafe (incomplete) deck girder construction with only minimal connections between the girder and the post top.

[Click to enlarge any image or table]

When you find a deck built like this one, it makes sense to check every point where a connection should have been made.

For the strongest connection of beam to post, place the support beam directly on top of the posts, rather than bolting them to the side, so the full load is transferred to the posts.

To keep the post in place and to prevent any twisting or shifting, the connection should be reinforced with steel strapping, a steel connector, or a treated plywood cleat (Figure 4-13).

In general, notching a 4x4 post will leave too little wood for an adequate connection. A double 2x beam can rest on a notched 6x6 post, as shown.

For the strongest connection of joists to the support beam, the joists should sit on top of the beam. For a more streamlined appearance, however, joist hangers are acceptable.

Make sure the hangers and nails are approved by the manufacturer for use with the new types of pressuretreated wood (ACQ or ACZA) and fill all the holes in the hangers with properly sized nails.

In general, nail into the joists with 1 1/2-inch joist-hanger nails and nail into the beam with 10d to 16d common nails, as specified by the hanger manufacturer. Sizes for joists and beams are shown in the deck beam & joist span tables below.

[Click to enlarge any image or table]

This article series discuss best porch & deck construction practices.

This article series includes excerpts or adaptations from Best Practices Guide to Residential Construction (Steve Bliss, J Wiley & Sons) , by Steven Bliss, courtesy of Wiley & Sons. Also see our BOOK REVIEW of that book.

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Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

Comments: this is the berst reference site I have ever come across

(Mar 29, 2012) Fritz Petersen said:

This is the best reference site I HAVE EVER COME ACROSS ON DOING ANY RESEARCH ON GOOD WORK PRACTICE .

EXCELLENT SITE FOR ANY INFO NEEDED FOR GOOD BUILDING PRACTICE .From an old carpenter .

Reply:

Thank you so much Fritz, we work hard to provide accurate, researched data without bias; to that end we also welcome questions, content suggestions and criticism. - DF - editor.

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Continue reading at DECK BEAM CONSTRUCTION or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX.

Or see these

Recommended Articles

• DECK & PORCH CONSTRUCTION - home
• DECK DESIGN & BUILD - home
• DECK FRAMING TABLES, SPANS

Suggested citation for this web page

DECK BEAMS & GIRDERS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

Or see this

INDEX to RELATED ARTICLES: ARTICLE INDEX to BUILDING DECKS & PORCHES

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Or see

INDEX to RELATED ARTICLES: ARTICLE INDEX to BUILDING STRUCTURES

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Citations & References

In addition to any citations in the article above, a full list is available on request.

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