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Old 07-21-2010, 11:21 PM   #1
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Building simple roof for kids play fort


I was planning on using the metal sheets that are used for pole barns.

I have 4x6 poles spaced in every direction 8 foot.
I was going to construct treated 2x4 roof truss bolted to each 4x6 pole.

So my truss spacing would be 8 feet between each one.
then I would run 2x4's perpendicular to the trusses at intervals.

Then attach the metal sheeting as a roof.
The roof will never be walked on.

Any other ideas?

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Old 07-22-2010, 08:11 PM   #2
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Building simple roof for kids play fort


hey there,
8' is a bit much for a 2X4, even for only carrying the weight of the metal roof.

why not frame it like a regular gable roof?

i would run a double 2X6 or 2X8 across the poles on edge like a regular header.
a 2X8 ridge, and 2X6 rafters 2' OC (or 2X6 ridge with 2X4 rafters if you insist), then run continuous 2X4s on the flat perpendicular to the rafters, 2' OC, then screw the metal roofing to that. you can let the 2X4s run long for an overhang, and hang a "barge rafter" off them.

building it as you suggest would probably work, but imagine it would be a bit wobbly.
i mean, there's something to be said for not overbuilding and keeping it simple, but i wouldn't intentionally make it a cheesy structure either.
then again maybe i'm wrong.

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Old 07-22-2010, 11:04 PM   #3
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Building simple roof for kids play fort


I need to find a picture or photo of what you are talking about.
I am not really sure, never done this stuff before.
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Old 07-23-2010, 07:49 AM   #4
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Building simple roof for kids play fort


a quick google search:

http://www.front-porch-ideas-and-mor...-rafters-1.jpg

built like a porch roof because you have only posts rather than a typical 2X wall under the roof.
i would like to see the posts connected by something continuous rather than just secondarily by trusses and sheathing.

so, i would install a double member across the tops of your poles, on edge, toenail them in or buy brackets sized for your poles and 2X6/8.
herringbone the corners, meaning start with the inner piece and stop it 1 1/2" short of each end. the other sides will lap that, stopping 1 1/2" short in the other direction, and then the outer piece will lap the first and the end grain of the other side. nail everything together in both directions.

then you can either do your trusses or stick frame something really simple.
i would think cutting rafters would be easier than building trusses.
calculate rafters with online calculator. i would choose a pitch, and your run is 4' minus half thickness of ridge, so 3' 11 1/4" - but double check this of course.

then you hold your framing square on the rafter in the right rise/run setting, mark the top for the plumb cut angle. measure down from the tip of the that the rafter length, mark the "building" line. then come up that whatever distance you want to get the bird's mouth and bearing that you want, and cut it out.
test the rafter.

i would cut the two end pairs of rafters, and toenail them down onto your beam. they should stay up and leave roughly a 1 1/2" gap between them.

then slide your ridge board in there, nailing through the ridge into end of one, and at an angle through the ridge into the other.

then just slam the rest in at 2' centers.

this is just the way i would do it. i'm sure there are other viable options, too.
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Old 07-23-2010, 06:34 PM   #5
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Building simple roof for kids play fort


I think the double 2x6/8 is overkill for the header?

I understand the rest
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Old 07-23-2010, 07:36 PM   #6
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Building simple roof for kids play fort


the header is the whole thing.
it's an 8' span. you could do 2X4s but what do you gain? maybe you save $10 in materials?
anyway, i don't care what you do. just trying to provide a little guidance.
good luck, and have fun.
in the end, it's a kid's play fort and pretty much anything you do will hang in there for a few years, at least, until the kids outgrow it and/or it collapses under its own weight. but for the same amount of money and time, why not build something solid?
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Old 07-23-2010, 10:52 PM   #7
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Building simple roof for kids play fort


Where are you located ?

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