Porch addition..May be?

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Old 07-28-20, 11:40 AM
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Porch addition..May be?

Thinking about adding a 15 x 15 covered porch attached to the back of my house. Instead of using a support header in the middle of the porch, can I add a second 2 x 6 on all the trusses to absorb the snow weight? In other words, I want to use (2) 2 x 6 trusses all the way across without the use of a support header in the middle. Does this make sense or legal? advice, please.
 
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Old 07-28-20, 11:58 AM
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We will need a lot more information. Your talking about modifying trusses before you even begin. That's not a good sign. Do you have any drawings or plans you can post?
 
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Old 07-28-20, 01:47 PM
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Porch addition..May be?

Perhaps, trusses is the wrong choice of word. Rafters?

Basically, It's just a cover porch or lean-to that ties-in with the house with no walls of any kind. Each rafter will contain (2) 2 x 6 to cover the 15' span with approx 18" center to center.

I was concern if the double 2x6 can absorb the snow load without using a support beam in the middle?
 

Last edited by ThepMi; 07-28-20 at 04:09 PM. Reason: wrong verbages
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Old 07-28-20, 09:57 PM
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How much of a snow load are you talking about ?
What location ?
Roof pitch also has a lot to do with snow load.
 
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Old 07-29-20, 05:48 AM
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Search online for "rafter span table" and you will find the information you need. A 2x6 can not span that distance especially with a shallow pitch and snow load.
 
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Old 07-29-20, 06:15 AM
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Porch addition..May be?

We are living in Michigan, so winter gets a decent amount of snow.
 
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Old 07-29-20, 11:36 AM
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Porch addition..May be?

Thank you.

Understood of the 2x6 cannot span to 15 feet distance. But what if you sisters (2) 2x6, it would be the same as a 4x6 at 15 feet. I'm wondering if that is permissible. I cannot find anything on the internet sistering (2) 2x6. That's why I'm asking.
 
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Old 07-29-20, 12:06 PM
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No, two 2x6 are not the same as a 4x6. It would be better to go to 2x8 or 2x10.
 
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