Chicken coops plans

My 9-5 is working as an engineer in the truss industry.

I routinly check designs with clear spans of 80+ feet.

Ag type trusses commonly come in 30-60′ 4-8′ OC single ply.

There are virtually no clear span limits, but note most truss tables (the tables trusses are built on) are only sold up to about 80′

a few exist in the 100′ range.

a 120′ clear span feild splice is possible, but at that point your starting to push the limit of what is economicaly justifiable fin wood vs steel for that kind of clear span.

Ive personally worked on a 6 piece 300′ truss that was nearly 40′ tall when it was all assembled (in the 3 layers of piggy backs)

most AG trusses will require large material for TC and BC material. TO make maxium use of the lumber, larger OC spaceing is used to offset the total cost of the building.

I recently came across a really cool 40×40 (although size is varriable) 1 sided “run in” machine shead, dual pitch roof with the entire front 40′ clear span. (although they are often 3 sided)

shoot me a PM ill be happy to run some basic designs and shoot you some ballpark prices of what you could expect to pay.

IT should also be noted (perhaps it already was i only skimmed part of the repsonses) Is that a 4/12 20′ span 2′ OC with 2′ overhang is a “standard” truss most real lumber yards will have on hand. Menards is one that i KNOW stocks that. (they are a customer of ours) a 24′ truss with 2′ cantalever both ends with no top chord overhang will NOT be a stock truss as the heal type is significatly diffrent. (note you can not set a 24′ clear span truss 0″ OH on 20′ wide walls and call it ok)

some other fun things, i recently did a design for a friend that wanted “as large an overhang on the front as i can get” i said, 6′…8′… 10′ what do you WANT. he thougth “large” ment 3′. he was shocked to find out how easy it was to speck out a truss with a 8′ front cantalever (overhang)