03-24-2014, 12:06 AM
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#2
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Yurt Forum Addict
Join Date: Nov 2013
Posts: 2,187
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Re: Puzzled about tension band
I'll get to your question but let me give you some construction details first.
I scratch built a 16' yurt. I use 3/16ths vinyl coated rope (wire) for my tension band. Got it at Home Depot. It sets in the lattice crosses at the top of the wall.
I calculated the length of the tension band using 3.14 (pi) x dia. My tension band wire runs around the entire top of the yurt wall, including over the door frame. That way there is zero chance the door frame could seperate from a snow load, etc.
I formed loops in either end of the wire, using standard wire rope loop hardware with the three clamps. I have the ends carabinered together. That way I have the EXACT length of band to tension the rafters to the roof ring. There's no give to that cable at all. Four big guys could stand on the roof ring and hop up and down and it wouldn't give a bit.
The big advantage of having the tension band premade is, there's no fiddling around adjusting the proper tension when erecting the yurt. Get the khanal opened. Attach the khana to the door frame. Get the two, three, or four wall sections joined to eachother.
Work the tension band into place. You might have to open or compress the wall lattice very slightly to get it to drop into place. After a couple times, you'll know you have it on the money because the lattice crosses form perfect squares, at least on my yurt design. Get the roof ring up on its stand and start shoving the rafters into place and onto the lattice crosses. As you install the last couple yer gonna smile because its a PERFECT fit.
No rafters falling out. No rafters bopping anybody on the head. No fiddly fating around. No head scratching. Fast and easy. You can really erect the yurt very fast with this system.
Now onto your specific question. I have a two piece cover, wall and roof. I hang my wall cover off the lattice crosses AFTER the tension band is in place and the rafters are up. I stitched loops in the top of the wall cover and merely drape the loop over one of the laths. That keeps the cover up very high, and tight to the lattice. No hanger cord. No misc hardware. No fiddling around. Just roll out the cover around the frame and hang it. Done.
My roof cover is sized to drape down over the wall cover by about 12- 18". I also added loops on the cover up at the roof ring hole, and around the perimeter of the cover edge down at the wall. I secure the cover at the ring to screw eyes in the ring. And, run cordage through the wall loops and tie off at the door frame Then tie that cordage down to ground anchors. That pulls the cover down tight, and helps anchor the yurt to the ground. Let the wind blow baby, it's bombproof.
To tie off the cover tight to the wall just below the lattice crosses, I do the traditional rope all around the yurt from the door, to the door, and tie it off. That snugs the cover very tight to the wall. No bugs no drafts etc. I also rope around the yurt at the middle, and at the bottom. That way in the summer I can roll up the wall cover and tuck it into the lower rope. That lets in the breeze and starts a good convective flow of cool air.
Hope that answers your question.
Good luck.
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