Replies

1. 
   alan_r. | Dec 09, 2001 08:18am | #1

   *
   Is there exterior sheathing? e.g.,7/16 osb,etc

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   nathan_wegemer | Dec 09, 2001 08:53am | #2

   *A single joist or rafter. Doubled plates allow you to place the joist /rafters anywhere along the wall. My understanding is that if you point load a wall from above with anything other than the above, you need to add bearing dirctly below the point load. Depending on the weight of the load, it could range from doubled 2x4 hemlock studs nailed together on a pattern, to a single 3x4, to 4x4 douglas fir, 4x6,or even a steel column sitting over a reinforced section of the footing. Whaterya doin?

1. 
   Boss_Hog | Dec 09, 2001 04:17pm | #3

   *Surely he's not expecting us to call him, since he dropped in and asked a question?

1. 
   Mike_Smith | Dec 09, 2001 06:45pm | #4

   *as nathan said.. not much if it's a point load.. and if it's a point load then the 2x4plate becomes a beam.. and you do the calculation based on that...also.. if you are calculating the 2x4's as a beam..you will have a hard time figuring what the beam dimensions are.. is it 4x2 (nominal ) ?how much credit do you get for stacked beams (double plate ) ?

1. 
   Jim_A._Jensen | Dec 09, 2001 10:30pm | #5

   *Nathan Wegemer, WhaterIam doing?? It's a mess, 2x6 rafter's, 4/12 pitch,24" center's, spanning 15'6",existing 25 year old home, purloins running midspan, with a knee wall bearing on 2x6 ceiling joist, the ceiling joists clear span of 15', some 16"centers,some 24" centers. Life was good for this ole home, until somebody decided to replace the wood shingles with concrete roof tile at 10 lbs. per sq. ft.My friend told me there was a town, or city, in Michigan,that was named after this roof.Again, I, Thank You, for your Responce's. Jim A Jensen. P. S. Ron ,just send me a Christmas Card instead.

2. 
   nathan_wegemer | Dec 10, 2001 12:36am | #6

   *Jim, take this as if it's coming from the hip...if your ceiling at the wall intersection is not wavy, it's ok. Focus on the ceiling under the knee-wall above. I imagine that's going to be where the deflection of the shallow pitch rafters will telegraph to first. If you place a straight edge along the length of one of the ceiling joist, and it shows a reverse crown, then your problem is much bigger than the wall framing. Removing the tile and replacing with wood would be good first step. Luck to younathan

3. 
   Boss_Hog | Dec 10, 2001 03:09am | #7

   *Jim -Sorry if I misread you. I got the impression that you had breezed in, posted a question, and were never to be heard from on these forums again. (It's happened before, after people put a lot of time and effort into responding to the questions)As for your double top plate question - I've never heard of it being a problem. Even 60' wide buildings with trusses 2' O.C. don't seem to be a problem, even though every other truss is halfway between 2 studs.

4. 
   Jim_A._Jensen | Dec 10, 2001 06:22am | #8

   *Ah Life, and wall loading, Alan R., it's 1/2" celotex.Ron,thanks, and then there's Nathan,I've burned up a few brain cells on this job,there are 5 different roof sections,4, are way overloaded.Nathan, the roofer's are hopefully coming this "Monday".As soon as the weight is off , I'am going to "fillet" the roof sheathing open, slide in some 3 1/8" x 7 1/2" glulams, spin two down along the knee wall,now where those glulams hit along the exterior wall,and where the HAVE to hit in center of the attic,will be what it will be.I'll brace off the Lams, to straighten roof rafter's.For if the Lams, do hit in the center of studs, I was hoping for a design load number,yes it would be a point load,also note, the owner does like her wallpaper walls,and I don't really want to open up the exterior wall sheathing.The next step is to slide in another 2x6 to sister to the existing ones, then kick off the center wall with a short 2x6 at 45 degree ,with all that , then the point load will be minimum.The roof is 36' wide on this section of repair.Nathan,I do appreciate your from the Hip.

5. 
   nathan_wegemer | Dec 10, 2001 06:31am | #9

   *any way to put a stem column under the g-lam, about 12" or so into the room on each end of the beam? Could put an arch in the top, create a box beam between the two..Are you going to have to shave the top of the beam, where it breaks the plane of the roof? This will substantially decrease the load you can put on the beam. I don't have the CM4 with me, but me thinks a 2x6 rafter at 4/12 is either 5 13/16 or 6 1/8 at the hap. I guess that's not taking too much off.. forget it. Point load, no doubt. I'd try to chase the load to the footing with some interior columns. CVG, shaved rabbetts, little arch.. starting to drool now.Have fun.

2. 
   Jim_A_Jensen | Dec 10, 2001 06:31am | #10

   *
   Question, Does anybody know, how much weight will a top plate and double top plate carry, at the center, between two 8'-2x4 studs, placed 16" on center, before any amount of deflection will occur, and or , a given number from accepted building practice's. Note- Wall is Exterior, studs are D.F.,Plate is White Wood,Drywall inside,Wood Siding on Exterior, Setting on a Masonry Stem Wall. I Thank You, Jim A Jensen, 1-928-717-1641