Replies

1. 
   Framer | Jul 23, 2003 05:19am | #1

   Yes. Just put a 2x4 on a flat and 2x6 on edge strongback at half span and you'll be fine.

   Joe Carola

1. 
   gdcarpenter | Jul 23, 2003 05:52am | #5

   Thanx framer, wife's from Jersey.  I'm a displaced Cannuk.  One of those mixed marriagesLet's not confuse the issue with facts!

1. 
   Framer | Jul 23, 2003 06:04am | #6

   Where's she from? Ask her what exit. ;-)

   Joe Carola

1. 
   gdcarpenter | Jul 24, 2003 12:51am | #9

   Exit 9 I believe, were you serious or just using the standard Joisey joke.  She grew up around Sommerset (sp) if I recall correctly.  Close to Rutgers, or whatever it is called now.  We get up that way once or twice a year.Let's not confuse the issue with facts!

1. 
   Framer | Jul 24, 2003 01:35am | #11

   Exit 9 I believe, were you serious or just using the standard Joisey joke.

   I was just being a GOON and using the Standard Joisey Joke. ;-)

   Joe Carola

2. 
   StevenWheeler | Jul 23, 2003 05:21am | #2

   I just framed mine in and was concerned with my span using 2x8's. It is only 14'2" and a wood ceiling. I'd go with 2x10's with that span and drywall ceiling.

   Steve

3. 
   RIPVW | Jul 23, 2003 05:40am | #3

   what's the pitch?  and whats the roofing?  i think you will need taller rafters....

1. 
   gdcarpenter | Jul 23, 2003 05:48am | #4

   Pitch 2.5:12

   Roofing 1/2" ply, paper, shingles

   Strongback great idea, cost effective too

   Rafters 2x6 but sitting on double 2x4's on flat between ceiling joists so they will just clear joists.  Double 2x6 header all around on 4x4 posts about 4' o.c.

   Let's not confuse the issue with facts!

   Edited 7/22/2003 10:50:15 PM ET by GDCARPENTER

1. 
   RIPVW | Jul 23, 2003 06:06am | #7

   well, somebody will probably correct me but i think you need 3/12 pitch for your composition shingles? i would suggest 30 felt, also.  it sounds like you have ceiling joists and  roof rafters -- both -- but connected? creating a weak little truss?  i still think you need something like i joists or at least 2x12's 2' on center or closer. how's your snow load?  (calif. or alaska?)

4. 
   kaorisdad | Jul 23, 2003 06:39pm | #8

   For a rafter supporting a ceiling, a 2 by 8 at 24-inches OC will span 14-ft max.  You'll need 2 by 8 at 16-inches OC which are good for 16-feet max.

   If I were you, I'd go with 2 by 10 at 24-inches OC.  Good for 16-feet. 

1. 
   gdcarpenter | Jul 24, 2003 01:01am | #10

   Only occassional snow loads here in Raleigh N.C.  I'm actually doing this as a favour for another contractor, waiting to get my ducks in a row for my next job.

   Figure I need ceiling joists and rafters because the gable end that's attaching to the house is attaching to a cantilevered second floor, ergo I want to go with a ridge board (using the ceiling joists) and NOT a ridge beam, because I'm sure as shooting that no extra load can be put on the cantilevered second floor.  Everything will be 16" o.c..  Figure with standard rafter/ceiling joist set up the roof load is essentially being carried by the walls of the new screened in porch.

   While I'm at it, were using existing deck.  2x10's @ 24" o.c..  Fella I'm doing the job figures sister the existing, I figure go 12" o.c. and reduce the span for the decking boards, same number of extra 2x10's either way.  He wants 5/4 board I'm recommending 2x4. 

   Thanx for all the replies, why is it that I do this again, please remind me!Let's not confuse the issue with facts!

1. 
   kaorisdad | Jul 24, 2003 07:05pm | #13

   Did not include any snow loads for the spans I gave.  Also, values I gave were for Doug Fir-Larch No. 2 or better.  I'm not sure what wood you use there.

   The floor joists should be ok for 2x10 @ 12-in OC - good for 17-foot span, again DF No. 2 or better.

1. 
   byoung0454 | Jul 24, 2003 11:32pm | #14

   Better yet why not just go with roof trusses and take care of the whole ploblem all together.

5. 
   byoung0454 | Jul 24, 2003 06:42am | #12

   Im look at my souther pine span tables put out by the Southern Pine Council  http://www.southernpine.com  table 2 Ceiling Joist-Drywall  with a l/240 deflection limit 1

   No. 3 Southern Pine 2x8          

                               12"oc 21'8" span 10psf 15'4" 20psf

                               16"oc 18'9" span 10psf  13'3" 20psf

                               24"oc 15'4" span 10psf 10'10" 20psf

   If you use No 3 or better you will be fine for your job