Roof install?

[docdubz]

I'm almost done with my barn/coop. I finally got my hands on the metal roofing for it. I have the rafters spaced at 3 feet but no beams going across. My question is, are these support beams necessary or is that more for building a roof that you intend to walk on?

 

[DobieLover]

Metal roofing is supposed to be attached to purlins.
Purlins are typically spaced 2' apart from the top of the rafters down.
3' on center rafter spacing will allow the roof to sag and eventually leak.

 

[DobieLover]

Rafters, plywood, underlayment and metal roof, and it ain't going no where. For a project about the size of a chicken coop, just slapping four piece of plywood up there and cutting chalk line once screwed in was the quickest / easiest solution I could find.

Also... on the metal... I butted mine up real neat on on end, and the ran them wild off the other side of roof. Then chalk lined the metal. Screwed a 2x4 as a fence into the metal, and than cut the metal with a hand held circular saw. Did not turn blade backwards. Worked like a charm! Was heavy gauge home roofing material too. Lots of that laying around still since 10/10/2018 Cat 5 storm.

Plywood is sold in 4x8 sheets.
The op has rafters 3' on center. The spacing is too far apart even if you want to use plywood which IMO is a waste of money. Purlins work just fine.

 

[Folly's place]

Don't underbuild!!!
It's 'only a chicken coop' but you will be out there, may need to get on the roof, and having it collapse on the flock, or a person, ain't better.
Take weather into account; wind, rain, snow if you ever have snow and ice storms.
Mary

 

[aart]

Metal roofing is supposed to be attached to purlins.
Purlins are typically spaced 2' apart from the top of the rafters down.
3' on center rafter spacing will allow the roof to sag and eventually leak.

Plywood is sold in 4x8 sheets.
The op has rafters 3' on center. The spacing is too far apart even if you want to use plywood which IMO is a waste of money. Purlins work just fine.

Ditto Dos^^!!
Here's a pic:

Wonders about the 3' rafter spacing<scratcheshead>

 

[Panhandler80]

Plywood might be just as easy as beams, and not much more expensive. You can lay two edges up square, the just start screwing them in. Chalk-line the wild sides, and take a handheld skill saw them. Done. Now it's darn sure tied together, and you can screw metal roof in anywhere you want without having to worry about where seams occur, or trying to hit rafters just right with screws.

Just a thought.

 

[docdubz]

YEP!

$1,600 sounds awesome! I spent significantly more than that building my own 64 square foot coop and 450 square foot fully enclosed / critter-proof run. I'm jealous.

Yea it's coming out quite nicely, especially considering I started off with no real plan and pulled this design out of my rear. All that's left right now is to do the roof which I'm about to start in a moment and then finish putting up the hardware cloth. The entire back wall is just going to be hardware cloth and the center of the barn is going to serve as a breezeway. Once that's done I have to decide if I want to paint the interior and start working on the trim and run. I'll probably save the trim for last since it's purely aesthetic.

 

[aart]

@docdubz will you add some windows?
Especially a big ones on the monitor sides:

 

[imnukensc]

Looks like a nice build, but didn't see any posts bordering on insults.

 

[docdubz]

Thanks all. One of the few construction related projects ive never done is installing a roof so I had no idea what I was doing. And I tend to make things more complicated than they need to be. Instead of laying the purlins over the rafters like in aarts picture I was going to cut crossbeams so they fit flush between the rafters and the sheer amount of measuring and cutting had me wanting to throw in the towel. I figured out that I was being an idiot just prior to reading all these responses. Still, the amount of lumber I need for purlins has me slightly regretting going with such a large build. I picked up another 25 2x4s the other day and said to myself "surely this will be enough to finish" and by my math I'm gonna need another 25.

Lol... This was supposed to be a small little lean-to style coop that would take me maybe a week to complete with a budget of $400. It turned into a 240 square foot barn with a 60 square foot hay loft that I'm 3 weeks worth of 8 hour days into building and has about $1600 spent on it so far.