How to remedy roof overhang not level

Question

I'm building a garden shed with 2x4's and have some roof overhang on the sides. Due to an inadequate design, exacerbated by a change in the design on the fly, the overhangs are slightly bending downwards.

The problem is that the overhang is only attached to the outermost roof beam, which pulls the beam down and sideways, out of plumb thereby causing the overhang not to be level with the rest of the roof.

I've tried solving the issue by fixing the beam to the top plates with more screws and a metal fastener, but the problem persists.

Any ideas on how I can fix this issue?

Answer 1

It looks like you have a metal roof, so there is not much weight there. You have 2 choices:

1. Remove the roofing and roof decking back far enough to access the second rafter in. Build a "ladder" for your end rafter and facia with 2x4s perpendicular every 2 feet. Build up your end wall so the angle is filled in and the ladder has something to sit on. Finish the roof. I attached a pic with my idea very poorly drawn in. The blue and yellow show the ladder the black is the rafter that is eliminated and then filled in with blocking. ( not an artist obviously)

OR

2. Add a couple of braces from the facia board angled to the wall for a little more support. Attach at the vertical wall studs not into the OSB. Roof is not heavy this will help with sag.

Answer 2

I see two fairly simple fix options.

1. Add two steel gussets to the faces of the framing. 1/4" by 3" bars about 6 feet long, fastened with countersunk flathead screws, would properly support the outboard subfacia (fly rafter) at each end. That would resolve 95% of the problem.

2. Remove the two end pieces of roofing steel temporarily and run the purlins straight through. They alone would support things fairly well. Add extras in that area if you like.

Answer 3

Why not use a lolly column to move the frame up a tad, and a 4x4 at an angle into the wall. Garages in my area all support their cantilevered roofing members like this sometimes by running the 4x4 down to the foundation. If you don't have a column handy, all you need is a car jack, a 2x4 for the functional equivalent. Then decide your angle and get out your rafter square. There's no prohibition of using structural members that aren't horizontal or vertical. ;)

EDIT: Added two shots of garages in my neighborhood. If you build a "triangle" in the right dimensions, then siding (if you're using vinyl siding) will install nicely if the length of the member that's fastened to the house is a multiple of the width of your siding. Simply side up to that board, and then go shorter starting with the next row upwards. My thinking is if you're going to build the shed once, don't use dubious halfmeasures like gussets and cleats or whatever. Do what professional carpenters do when they build small structures. $0.02