Free article - How to determine rafter/joist sizes

Started by John Raabe, October 25, 2006, 01:32:07 PM

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John Raabe

Here is a new public article I have added to the PlanHelp site. It is a tutorial on joist and rafter sizing and how to use an on-line span calculator.

None of us are as smart as all of us.


Incised Lumber???

I'm gathering that it's PT, but still not sure.

Also, where do you calculate the span from?  All the way across the foundation? or center to center? or inside edge to inside edge?

glenn kangiser

That takes a load off of my mind, Amanda.  I thought it had something to do with rednecks. :-/
"Always work from the general to the specific." J. Raabe

Glenn's Underground Cabin

Please put your area in your sig line so we can assist with location specific answers.

John Raabe

Amanda: See my diagrams in the linked article. That is where I show how to determine the span.

(Incised lumber is the PT lumber you see peppered with injection marks. It is not the only way to treat wood.)
None of us are as smart as all of us.


Yep, it would have helped if I'd scrolled down a bit.  I've never done that before--since the last time anyway.

I had run a search on incised lumber, but the best looking of the first few sites (no giant .pdf files!) refused to open--and for some reason I didn't think to look at the cache.