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Old 09-28-2017, 10:59 AM   #16
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Fair enough.

I keep wondering though how or if this design could be any weaker than the lookout overhangs on thousands of other houses. I would imagine it would be just as strong.
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Old 09-28-2017, 11:11 AM   #17
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Re: How long can I make these overhangs?


Quote:
Originally Posted by Animag771 View Post
Fair enough.

I keep wondering though how or if this design could be any weaker than the lookout overhangs on thousands of other houses. I would imagine it would be just as strong.
On a gable roof, we always built the ladder that I explained, others do just hang the liner and fascia off the plywood or osb but only up to 12" total.
When a longer overhang is called for like 24" the gable truss is made 1 1/2 inches lower so 2x4 blocks can be run over it and be nailed to the next truss.
That is what the truss company asked for but often the inspectors would ask for a 2x4 be nailed to the side of that 2x4 on the flat as they were worried about sag in that 24"

So that is what my answer was based on if that helps.
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Old 09-28-2017, 11:15 AM   #18
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Re: How long can I make these overhangs?


Build a small mock-up of the roof on the ground and have 220 lb. man stand on it.

Just my opinion.

I wouldn't build a roof system like that one.

If you look at the bottom picture in post #1, how would you explain the ventilation of the roofing system.
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Old 09-29-2017, 10:24 AM   #19
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Quote:
Originally Posted by ron45 View Post
Build a small mock-up of the roof on the ground and have 220 lb. man stand on it.

Just my opinion.

I wouldn't build a roof system like that one.

If you look at the bottom picture in post #1, how would you explain the ventilation of the roofing system.
I'm not sure which part of the picture you talking about, but I'm assuming you mean the corner of the roof. There are flat 2x4s extending from both sides of the corner to create the overhangs, but just a bit higher up the roof you can see a 1x4 running horizontally. That 1x4 runs adjacent, to the gable 2x4s, but not on top of them, which creates a 3/4" air space above them.

If there is a 2x4 running perpendicular to the roof slope, the furring strips provide a 3/4" gap above it. If that makes any sense.
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Old 10-01-2017, 11:40 AM   #20
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Quote:
Originally Posted by ron45 View Post
Build a small mock-up of the roof on the ground and have 220 lb. man stand on it.
I don't know a 220lb man to stand on a mock-up overhang, but I did test it.

What I did is cantilever a single 2x4 on it's flat out 24" (I should have done 22.5" because of the fascia) about 2ft off of the ground. Then I (135lb) loaded myself up with 45lbs (180lb total) of weight and walked out to the edge. There was a little flex but not terrible, then I started bouncing, just cause. While bouncing the flexing was definitely noticeable, but that's like putting 400lbs on the overhang over a single 2x4.

After my little test, I feel pretty confident about the strength of the overhang design. Especially once the battens and metal roofing are applied. When I think about it, the only time any significant weight will be applied to these overhangs is when someone is actually standing on them and unless they are loaded down with weight and jumping around, nothing bad is going to happen.
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