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Old 07-15-2009, 11:29 AM   #1
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deck cantilever

How far can I cantilever from a beam for a new planned deck? Let's assume 2x8 joists 16" oc over a doubled 2x10 beam.


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Old 07-15-2009, 01:08 PM   #2
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deck cantilever

Here you can overhang max 3' with a 2"x8" SP#2 16 o.c. and no roof load. Code requires solid blocking over the beams when doing so. I would refer that question to your local building department to make sure its the same in your area before doing it that way.

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Old 07-15-2009, 01:48 PM   #3
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Location: Alberta, Canada
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deck cantilever

Yes, check into your local code.

Where I live the formula is 2.5 times the depth of your joists up to a maximum of 24". So in your case with 2X8 lumber the maximum cantilever you can have is 20".

Your codes in your area are most certainly different.

A DIY Noob that knows just enough to be dangerous.
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Old 07-16-2009, 08:00 AM   #4
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deck cantilever

Thank you for the info!
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Old 07-18-2009, 04:33 PM   #5
Join Date: Dec 2008
Location: MD
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deck cantilever

Rule of thumb is 2 feet back and one foot overhang.

We did some water front condos in MD some years ago that had a 60% overhang . If I remember we had a bean 4 foot off the building and the cantelevier was 5 feet with a 4x band we used revers crowns and upside down hangers.

I have the photos someplace around here.
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Old 07-23-2009, 12:27 PM   #6
Join Date: May 2008
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deck cantilever

Backspan to cantilever ratio needs to be at least 2:1

And depending where you live

Snow load................... 30psf........... 50psf.......... 70psf
Max Cantilever Span...... 42"............. 34"............. 29"

Based on 2 x 8 16oc

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