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Homeowner Forum / Construction / October 2005



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cedar rafter span max

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Diane - 28 Oct 2005 16:06 GMT
Had engineer say my 4x8 cedar rafters were ok for concrete tile over
deck/porch/balcony last year, but there were span issues with the 18' 4x6
barge rafters that extend over both the house & deck.  His suggestion of
multiple LVLs was not appealing, so I had asked him on the phone whether
adding bracket supports (4x12 beams) roughly at mid-point  would work.  He
had said yes, but now I can't find my notes to that effect.   Construction
is busy here & it took over a year to find someone to do needed work (moving
barge rafters in 6", adding lookouts to the parts over the house & support
bracket beams on 2 story = not a DIY project), but it's *finally* done and
"feels" rock solid.

Want to check again that 4x6 cedar (engineer assumed #3) would be ok for
9'6" span or will I need to sister with something...  Truss designs for
house called for loads of 10 dead & 30 live.  I know, the obvious thing
would be to call the engineer back, but it's been over a year...

TIA
RicodJour - 28 Oct 2005 17:22 GMT
> Had engineer say my 4x8 cedar rafters were ok for concrete tile over
> deck/porch/balcony last year, but there were span issues with the 18' 4x6
[quoted text clipped - 11 lines]
> house called for loads of 10 dead & 30 live.  I know, the obvious thing
> would be to call the engineer back, but it's been over a year...

A year, or five, same difference.  If he's the one that did the
original design it's a lot easier to just ask him.  No one here can
answer such a specific question without more information (local codes,
design loads, specific connections, etc.).

Don't worry, most engineers don't bite.  Charge you, maybe, but never
bite.

R
Diane - 29 Oct 2005 02:44 GMT
< A year, or five, same difference.  If he's the one that did the original
design it's a lot easier to just ask him.>

He didn't do the design; was just supposed to verify existing roof
structure.

Mostly I'm hesitant 'cause he indicated that he had done a lot more work on
my project than what he charged me (most likely true) & seemed pretty
determined to call an end to it.  And we didn't use his written method to
remedy the problem...
Bob Morrison - 28 Oct 2005 19:26 GMT
In a previous post Diane wrote...
> Want to check again that 4x6 cedar (engineer assumed #3) would be ok for
> 9'6" span or will I need to sister with something...  Truss designs for
> house called for loads of 10 dead & 30 live.  I know, the obvious thing
> would be to call the engineer back, but it's been over a year..

So call him back.  It should only take a few minutes for him to look up
his notes and give you an answer.  If this were my project I probably
wouldn't even send you a bill unless you needed something in writing.

Signature

Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA

 
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