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Rat Runs and Wind Braces wooden trusses - YouTube
https://www.youtube.com/watch?v=phDHpttvO6s
Bracing the trusses internally part Use 2x4 marked 4' OC for the rat runs. These boards will run parallel with your headers and help to tie the bottom of th... Rat Runs and Wind Braces wooden...
rat run, i.e., bottom cord bracing - JLC-Online Forums
https://forums.jlconline.com/forums/forum/jlc-online-expert-forums/rough-framing/29245-rat-run-i-e-bottom-cord-bracing
I'm guessing you could still run a 2x rat run brace perpendicular across all your ceiling joists to tie them together, and then run your 3 diagonal braces at the angle required with them nailed to the tops of the joists butting into the rat run brace to keep them from kicking out, then add plywood gussets on both sides tying them to the joists.
Rat Runs in Attic - DIY Home Improvement Forum
https://www.diychatroom.com/threads/rat-runs-in-attic.166174/
A rat run is a single 2X nailed flat on top of the bottom cored of the trusses and have no other purpose other than keeping the bottom of the trusses on layout. You nail the rat run on layout prier to nailing the bottom cord of the trusses to the top of interior walls. If what you have is a rat run (cat walk) then it could be removed imo.
rat run, i.e., bottom cord bracing - JLC-Online Forums
https://forums.jlconline.com/forums/forum/jlc-online-expert-forums/rough-framing/29245-rat-run-i-e-bottom-cord-bracing/page2
Re: rat run, i.e., bottom cord bracing For a low pitched roof, 2:12, your collar ties are not effective because there is too much tension on them. The collar tie connection to the rafters won't work, unless maybe you used split rings. So you don't have a trussed system that requires lateral bracing the same as a prefab truss roof would.
load-bearing capacity of a “rat-run” for various lumber dimensions.
https://www.finehomebuilding.com/forum/load-bearing-capacity-of-a-rat-run-for-various-lumber-dimensions
1. Commonly available dimensions of 2x pine. 2. Distance between underlying load-bearing supports. This application is addressing the issue of sagging roof common rafters. I expect there are rules of thumb in practice among contractors which generally follow the structural engineering guidelines, but I need some chapter and verse to take to the ...
8.0 General Instructions and Requirements for Installing L
https://apps.floridadisaster.org/hrg/downloads/HRGGEB8.pdf
• Rat runs located where you need horizontal braces can be used provided they are structurally sound and can be secured to attic floor framing with three fasteners on at least three framing members into the attic. However, a rat run for U-bent applications is not apt to be made to but t the retrofit stud snuggly as is required.
About Us
https://www.jcpolebarns.com/about
We use 2x4 rat run braces on the top of the bottom chord of the trusses we attach a kick brace at the top of the gable end running at a angle to the next truss attaching to the rat run brace. We use 2x4 wind diagonal bracing in every corner the brace attaches to the top of the corner post under the top plate and attaches to the bottom of the next post above the bottom plate and is nailed …
Bracing of Pre-Engineered Trusses - Structural …
https://www.eng-tips.com/viewthread.cfm?qid=286699
Built houses for years. All we ever got was a generic bottom chord bracing and usually just rat-run locations 90º to the direction of the truss. The rest of the bracing in the vertical planes and diagonals in the bottom chord was done by us, the builders. I don't think that is the way it should be, but usually it is.
Polebarn Specifications - Bradford Buildings
https://bradfordbuildings.com/polebarn-specifications
"Rat Run": Secondary frame structure along bottom cord of truss connecting gable posts from end to end. Standard Exterior Metal: 40yr warranty R-Loc plus 9" rib premium metal, metal panel to wood connection via American made screws. Trim: Fascia: Standard: Eve Side: Rat Guard: Standard: Overhead Door Trim: Standard: J-Trim: Standard
Roof Truss Bracing Done Right - DoItYourself.com
https://www.doityourself.com/stry/roof-truss-bracing-done-right
Nail braces vertically every 4 feet along the top and bottom of a gable truss. Turn the truss upside down and place on corner on the roof surface. Slide the rest of the truss up, using a 2x4 as a ramp if necessary. Lifting trusses higher than one story may require a crane.
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