Header For A Loft - Building & Construction - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum header for a loft

11-13-2009, 01:40 PM   #1

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I am building a loft in my shop for storage. It will be used to store rarely used items. I don't see how the dead load will be more than 10-15psi.

Details:
total measurement will be 8'x30.' The floor joists will run the 8' width (cantilevered at 7') and be 2x8 doug fir 16" o.c. with 3/4" sheeting.

One edge of the 30' run will be attached to a ledger on an existing wall and the other edge will be supported by a header. The header will span 10' sections and be supported by posts at the breaks.

My question is will a 4x8 doug fir header be sufficient to span the 10' sections? I know the common rule of thumb is 1" per foot of run, but I was told for this application an 8" header is more than sufficient.

Thank you very much for the help.

 11-13-2009, 02:20 PM #2 Member   Join Date: Oct 2009 Location: Upstate NY Posts: 94 Rewards Points: 75 does this help?

 11-13-2009, 04:36 PM #3 Join Date: Nov 2009 Posts: 4 Rewards Points: 10 Stay with rule of thumb. My father so overloaded his attic, 4' center headroom, that he broke 2 trusses. Stuff that you store can be quite heavy even though you put it up there witout much effort.

11-13-2009, 05:53 PM   #4

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Quote:
 Originally Posted by CustomBuild does this help?Attachment 14805
I have seen that table before , but I have a little trouble deciphering what the numbers mean exactly. I known the left column is the dimension and what type of wood it is and the top row is how far the beam will span between support. However, what do the corresponding numbers to the right of the beam size and species mean? (I.E. what is the significance of the numbers 10-9-8-7-7-6-6-6 mean to the right of 4x8 doug fir?)

Thank you very much.

 11-15-2009, 11:38 AM #5 Member   Join Date: Oct 2009 Location: Upstate NY Posts: 94 Rewards Points: 75 A search of douglas fir span tables reveals a wealth of information if you are a practicing engineer. I found that table, and referred back to the website it came fromhttp://www.ideas-for-deck-designs.com/deck_beam.html, and couldn't come up with an answer to your question. I wouldn't use this design for habitable spaces, but here's something I have used in barns before, just to make sure the span is acceptable.
 11-15-2009, 02:12 PM #6 Registered User   Join Date: Mar 2009 Posts: 11,730 Rewards Points: 526 With 2x8x8' @16"o.c.--------- 15# max.load. 16/12 =1.34 x 8' = 10.72 x 15#live load + 10# dead load = 268# per square foot x 10' span = 2680# A 4x8 doug-fir with a 1350fb, either d/f north or south, has a load limit of 2759#. Yes, it will work if you do not exceed the 15# live load per square foot on it. Be safe, Gary __________________ If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent. 17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
 11-16-2009, 12:50 AM #7 Join Date: Nov 2009 Posts: 3 Rewards Points: 10 Thank you very much for the information.

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