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Hi, Rikki,
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<div class="">It sounds like your architect plans what we call a ‘gable roof’ in the US. I don’t know if anyone has tried the design shown in your architect’s drawing, but I would advise against it. It asks bales to do what they are least good at- resisting
point loads/forces. A ridge beam in this kind of roof framing will bear about half the weight of the roof. That isn’t too bad for a lightweight metal roof on a sunny day in summer. When the roof is covered by two feet of snow, or clay tiles, or a couple
of layers of asphalt shingles, a large amount of weight is concentrated on one spot in the top bale, and on the gap between two bales on the second row. </div>
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<div class="">The thin wooden panels shown will help a little bit, but they, too, will flex under load. When roofing loads are distributed evenly, I don’t think that ‘creep’, the slow deformation of bales under prolonged load, is a severe problem in most strawbale
houses. In this design, creep would probably be a factor, and the ridge beam could get a little lower each year. </div>
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<div class="">If the pyramid of bales shown in the drawing was faced with plywood on the inner and outer faces, it would increase the resistance to deflection by about 1000 times, I’m guessing. This would be a much more reliable method of transferring the
roof loads to the wall, and then to the foundation. It might be necessary to shave those bales down by the thickness of the plywood, to get the dimensions that you want from the bale and plywood composite. </div>
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<div class="">Other architects and engineers on this list may have better ideas. This is the best approach that I have thought of, which remains very similar to the architect’s drawing. </div>
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<div class="">Best wishes,</div>
<div class="">Derek<br class="">
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Derek Roff</div>
<div class=""><a href="mailto:derek@unm.edu" class="">derek@unm.edu</a></div>
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<div class="">On Jun 23, 2017, at 9:06 AM, Rikki Nitzkin <<a href="mailto:rikkinitzkin@gmail.com" class="">rikkinitzkin@gmail.com</a>> wrote:</div>
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<div class=""><span style="font-family: SourceSansProRegular, Helvetica, Arial, sans-serif; font-size: 14px; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">Hi all, </span></div>
<div class=""><span style="font-family: SourceSansProRegular, Helvetica, Arial, sans-serif; font-size: 14px; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class=""><br class="">
</span></div>
<div style="orphans: 2; widows: 2;" class=""><font face="SourceSansProRegular, Helvetica, Arial, sans-serif" class=""><span style="font-size: 14px; background-color: rgb(255, 255, 255);" class="">I forward a petition from a Spanish architect who wants to know
if his idea has been tried, and if it worked.</span></font></div>
<div style="orphans: 2; widows: 2;" class=""><font face="SourceSansProRegular, Helvetica, Arial, sans-serif" class=""><span style="font-size: 14px; background-color: rgb(255, 255, 255);" class=""><br class="">
</span></font></div>
<div style="orphans: 2; widows: 2;" class=""><font face="SourceSansProRegular, Helvetica, Arial, sans-serif" class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="font-size: 14px;" class="">He is planning to build a Load-bearing
SB home. The roof will have two “waters” (what is that called in english?)- creating a triangular gap on both sides of the roof. </span></span></font></div>
<div style="orphans: 2; widows: 2;" class=""><font face="SourceSansProRegular, Helvetica, Arial, sans-serif" class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="font-size: 14px;" class=""><br class="">
</span></span></font></div>
<div style="orphans: 2; widows: 2;" class=""><font face="SourceSansProRegular, Helvetica, Arial, sans-serif" class=""><span style="background-color: rgb(255, 255, 255);" class=""><span style="font-size: 14px;" class="">He wants to try to put the main beam (Spanish
architecture </span></span><span style="font-size: 14px;" class="">doesn’t use triangular rafters, but a main roof beam, with the other beams resting on it) directly on the bales. His idea is to put a wooden panel on top of each row that is above the roof-plate,
until reaching the main beam- using very well compressed bales.</span></font></div>
<div style="orphans: 2; widows: 2;" class=""><font face="SourceSansProRegular, Helvetica, Arial, sans-serif" class=""><span style="font-size: 14px;" class=""><br class="">
</span></font></div>
<div style="orphans: 2; widows: 2;" class=""><font face="SourceSansProRegular, Helvetica, Arial, sans-serif" class=""><span style="font-size: 14px;" class="">Has anyone tried this? </span></font></div>
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</span></font></div>
<div style="orphans: 2; widows: 2;" class=""><font face="SourceSansProRegular, Helvetica, Arial, sans-serif" class=""><span style="font-size: 14px;" class="">Here is a drawing of the idea:</span></font></div>
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</span></font></div>
<div style="orphans: 2; widows: 2;" class=""><span id="cid:1408E1ED-468D-4B71-A637-21AFE4C40524"><hastial Alejandro.jpeg></span></div>
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