RAFTER POINT LOAD
RAFTER POINT LOAD
(OP)
IF A RAFTER SITS ON 2X6 PLATE, 3/4" PLYWOOD SUBFLOOR,
11 7/8" OR 14"TJI(SPAN VARIES).THE DISTANCE FROM RAFTER
POINT MEETS 2x6 PLATE TO INSIDE FACE OF 2x6 @16"OC EXTERIOR
WALL IS 8". CAN THE ROOF LOAD ON EACH TJI NOT BE TAKEN INTO
ACCOUNT AS A POINT LOAD, SINCE THE DISTANCE IS LESS THAN THE MEMBER DEPTH?
ALSO BLOCKING IS PROVIDED UNDER THE 2x6 PLATE PERPENDICULAR
TO TJI.
11 7/8" OR 14"TJI(SPAN VARIES).THE DISTANCE FROM RAFTER
POINT MEETS 2x6 PLATE TO INSIDE FACE OF 2x6 @16"OC EXTERIOR
WALL IS 8". CAN THE ROOF LOAD ON EACH TJI NOT BE TAKEN INTO
ACCOUNT AS A POINT LOAD, SINCE THE DISTANCE IS LESS THAN THE MEMBER DEPTH?
ALSO BLOCKING IS PROVIDED UNDER THE 2x6 PLATE PERPENDICULAR
TO TJI.






RE: RAFTER POINT LOAD
RE: RAFTER POINT LOAD
RE: RAFTER POINT LOAD
RE: RAFTER POINT LOAD
THEN THE RAFTER SITS ON A 2X6 plate, the inside end of the rafter to the inside face of exterior wall is about 8" do to the design of the eave (not at mid point of tji),which sits on 3/4" plywood sub floor, which sits over tji floor joists,(there are no tji rafters),then each tji floor joist would transfer the load to the exterior wall.and yes ther is a lvl rim board
RE: RAFTER POINT LOAD
If I understand the geometry, then the rafter load path goes through the 2x6 plate, through the subfloor and then into the TJI at its end, almost directly over a load bearing stud wall below.
If this is the case, then the TJI really won't feel any significant increase in shear or moment as the load is directly over the support below.
However, you do need to check web buckling in the TJI. APA design guidelines indicate that any end reaction greater than 1500 lbs. requires end stiffeners as well as cases where there is a top flange load applied which is greater than 1000 lbs. Other Plywood Web manufacturers have tables that indicate when web stiffeners are required.
Also remember that your total web load at the support includes both the rafter reaction as well as the TJI reaction.
RE: RAFTER POINT LOAD