PastorCharlie wrote:
So thus far the structure and any added weight by occupants will sit on 24 horizonal screws spanning 24 feet?
Well, when you put it that way, it sounds horrible! Lol.
This is just the beginning. I am not done supporting it yet. I wanted to get things in place all around the rv, and then finish my support structure.
Actually, I am glad you brought that up. That gives me an idea for a little test, on the strength of Kreg screws. May be a couple of days til done though.
Putting things into perspective ..... (drum roll please)!
Let's say we have 24 screws, and between the lumber and a person up there, lets say we have 600 lbs. 600 / 24 = 25 lbs per screw for a shear strength.
Since that weight won't be spread out over all 24 screws, if I am in the middle of the 8 footer or the 16 footer, we would have 16 screws. 600 / 16 = 37.5 lbs per screw for shear strength.
If we put all 600 lbs directly on top of 2 of the 2 x's, now we have 8 screws. 600 / 8 = 75 lbs per screw.
For shear strength, that doesn't sound all that excessive.
According to Rockler's website, shear strength has been tested on pocket hole joints - " Independent testing found that a pocket screw joint failed at 707 pounds when subjected to a shear load". That's from their web site,
HERE.So, with that in mind, I will test this within a few days, (I hope), and post the results.
Thanks for bringing that up.
