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|File:Reciprocal Roof Construction 11 Adjusting the Charlie Stick and Layout Ring.jpg |Final adjustments of the center ring. |11 |In this step some of the temporary ties were removed from the rafters to adjust the shape of the center ring slightly. In this case, the charlie stick was placed just a little too close to the center ring and was becoming stuck, and the gap for the last rafter was a little big, so a little shaking of the charlie stick and half the rafters got it to drop into shape. <br /><br />I would '''NOT''' attempt to do this much adjusting if i were using rafter poles over 6 inches in diameter, the weight at the top would be too great and the possibility of collapse much higher. <br /><br /> Also notice from Step 6, the charlie stick is '''outside''' the center ring and can be freely kicked out when the time comes | |File:Reciprocal Roof Construction 11 Adjusting the Charlie Stick and Layout Ring.jpg |Final adjustments of the center ring. |11 |In this step some of the temporary ties were removed from the rafters to adjust the shape of the center ring slightly. In this case, the charlie stick was placed just a little too close to the center ring and was becoming stuck, and the gap for the last rafter was a little big, so a little shaking of the charlie stick and half the rafters got it to drop into shape. <br /><br />I would '''NOT''' attempt to do this much adjusting if i were using rafter poles over 6 inches in diameter, the weight at the top would be too great and the possibility of collapse much higher. <br /><br /> Also notice from Step 6, the charlie stick is '''outside''' the center ring and can be freely kicked out when the time comes | ||
|File:Reciprocal Roof Construction 12 Cut off Ends of Rafters to Desired Length.jpg |Cut all eaves to length '''after''' placing them on the roof. |12 |The charlie stick is still in place. Before removing it we have determined the desired length of the eaves for the structure and cut the bottoms and tops of the rafter poles. <br />Remember in the the prologue of this How-To about the rise of the roof pitch. This rise also affects the length of your eaves if you want them to be all the same height off the ground. In this case we had to cut a little more off of the rafters in the middle of the spans between posts to get the desired height because the pitch is slightly steeper when the ''x'' horizontal distance from the top plate to the center ring gets shorter.<br /><br />Also notice how awesome the shadows cast by the rafters is on the ground, one of the beautiful perks from a reciprocal roof. | |File:Reciprocal Roof Construction 12 Cut off Ends of Rafters to Desired Length.jpg |Cut all eaves to length '''after''' placing them on the roof. |12 |The charlie stick is still in place. Before removing it we have determined the desired length of the eaves for the structure and cut the bottoms and tops of the rafter poles. <br />Remember in the the prologue of this How-To about the rise of the roof pitch. This rise also affects the length of your eaves if you want them to be all the same height off the ground. In this case we had to cut a little more off of the rafters in the middle of the spans between posts to get the desired height because the pitch is slightly steeper when the ''x'' horizontal distance from the top plate to the center ring gets shorter.<br /><br />Also notice how awesome the shadows cast by the rafters is on the ground, one of the beautiful perks from a reciprocal roof. | ||
|File:Reciprocal Roof Construction 13 Wire wrapping center ring.jpg |Wrapping thick gauge wire around the center ring to keep it from slipping out. |13 |Before removing the charlie stick we wrapped a double course of thick gauge galvanized wire around each rafter to the next in the center ring. Starting at the first rafter going in the direction you laid the rafters, wrap the wire as you remove the temporary ties. Once a full course has been wrapped pretty tightly, we are ready to pull out the charlie stick. | |File:Reciprocal Roof Construction 13 Wire wrapping center ring.jpg |Wrapping thick gauge wire around the center ring to keep it from slipping out. |13 |Before removing the charlie stick we wrapped a double course of thick gauge galvanized wire around each rafter to the next in the center ring. Starting at the first rafter going in the direction you laid the rafters, wrap the wire as you remove the temporary ties. Once a full course has been wrapped pretty tightly, we are ready to pull out the charlie stick. A short 1 min .SWF video can be viewed [http://www.appropedia.org/images/0/08/Reciprocal_Roof_Construction_Removing_Charlie_Stick_SWF.swf Here] showing the charlie stick removal and immediate strength of the roof once set. Please turn your sound off, there is nothing to hear and the quality is bad. There is also a video on the removal of a charlie stick on a bigger scale at [http://www.small-scale.net/yearofmud/2008/11/26/how-to-build-a-reciprocal-roof-frame The year of Mud Reciprocal Roof Blog]and here on [[http://www.youtube.com/results?search_query=removing+the+charlie+stick Youtube]]. | ||
|File:Reciprocal Roof Construction 15 Adding more wire and covering with bark strips.jpg | | |File:Reciprocal Roof Construction 15 Adding more wire and covering with bark strips.jpg |Adding extra wire for strength and bark to hide the wire. |14 |Some final touch ups after the charlie stick has been removed. The first course of wire has slipped a little as the rafters settled into place. Now that they have wiggled and found their locking position, an extra two courses of wire are added here to lock everything in even more.<br /><br /> [[https://www.google.com/search?q=hau+bark&client=firefox-a&hs=Ms0&rls=org.mozilla:en-US:official&channel=sb&tbm=isch&tbo=u&source=univ&sa=X&ei=Yb5zU5faOYGfqAaor4D4Ag&ved=0CDEQsAQ&biw=1024&bih=471&dpr=1#channel=sb&q=hawaiian+hau+bark&rls=org.mozilla:en-US:official&tbm=isch Hau bark]] was used to decoratively wrap over the wire for aesthetics. | ||
|File:Reciprocal Roof Construction 16 Finished Project.jpg |The Decorated Finished Product |15 | | |File:Reciprocal Roof Construction 16 Finished Project.jpg |The Decorated Finished Product |15 |Here is the finished structure sans roofing material and decking. At this point the final touches are sanding off all the sharp edges of the rafters and treating the poles with a preservative. this one was coated with [http://www.ecowoodtreatment.com/ Eco Wood Treatment]. | ||
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|footer= | |footer= Project on this page completed March 2014 in Hawaii as part of a community building workshop}} | ||
Revision as of 19:15, 14 May 2014
Coming Soon! In this page we will describe to you how to build a basic understanding of reciprocal roof construction with step by step instructions.
A reciprocal frame is a class of self-supporting structure made of three or more beams and which requires no center support to create roofs, bridges or similar structures. As quoted from Wikipedia.org
This page is intended to show the basic How-To's of installing a reciprocal roof on a structure.
The reciprocal roof lends itself to round walled structures. This structure is a hexagon, although, an octagon, decagon, or vertex-less/circular one would make installation easier. The reason being that the reciprocal roof pitch is determined by the x distance from the top plate to the tangent of the center ring where the rafters lay reciprocating over each other. If the x distance changes, ex: in a square with four corners the x distance from the center point of the square to the edges of the square box are not equal. It is a greater distance from the center to the corner than to the center of a face/side of the square. Therefore, the pitch of the roof will be shallower at the corners and steeper at the faces. In theory, the non sided circle is the best way to achieve an even pitch around the whole structure making a conical roof.
In this hexagonal structure built in a series of community workshops the roof pitch does vary slightly from vertex to face; but this can be mitigated slightly by placing the rafters a distance away from the vertices.
Enjoy this How-To for educational purposes, if this page does not help or if you are looking for more, here is another reciprocal roof how to with blog The year of Mud Reciprocal Roof Blog, enjoy.
File:Reciprocal Roof Construction 1 Finished walls with no roof.jpg
Round Pole Reciprocal Roof How To: