Until now, yurt manufacturers have restricted their engineering data with footnotes indicating that only balanced snow loads have been considered. But ski resorts, snow cat operations, high mountain lodges need more. Their rugged alpine conditions yield a winter’s worth of deep powder and big winds mixed with constant freeze/thaw cycles–and these almost always result in unbalanced snow loads. That’s why we engineered the strongest yurt ever.
In real-life, unbalanced snow load conditions create torsion and tension which significantly impacts the structural capability of a yurt. Wind and drifts typically pile all the snow on a north quadrant of your roof while the sun melts the south side clear. The Winter Stout Alpine Yurt is engineered with three-dimensional analysis which shows the Winter Stout Alpine Yurt can support bigger snow loads than most stick-built homes. The engineering confirms that a single quadrant of your yurt roof–the north side or the leeward side–can handle four times the ground snow load stated in the chart below.
What does this mean for you? You can depend on the Winter Stout Alpine Yurt in serious snow load conditions at high elevations for residential and public use. It also means that you can document the structural engineering for building officials as you would for any building–without footnotes or exceptions. Engineering analysis is available. Give us a call at 800.288.3190 or email us at [email protected]. The Winter Stout, it’s damn strong!
Snow Loads for a 30′ Winter Stout Alpine Yurt
|Exposure||Terrain Category||Thermal Roof Factor||Ground Snow Load (psf)|
|Fully Exposed||B and C||1.0||158.7|
|Fully Exposed||B and C||1.2||114.6|
References and Chart Definitions
*Engineering data is for reference only. Based on the assumption that the snow is loaded evenly across the roof. Combined and eccentric loads are not considered in this chart, but are taken into account on our Winter Stout Alpine Yurt data. Structural analysis is in accordance with the 1997 Edition of the Uniform Building Code and the 2003 International Building Code. Please call 800.288.3190 for more information.
Technical Input and References are from: 2006 IBC Building Code, AISC Manual of Steel Construction (13th edition), ASCE Standard Minimum Design Loads for Building and Other Structures, ANSI/ASCE 7-05, 2005 NDS National Design Specification, ACI 318-08, Building Code, 2005 Aluminum Design Manual.
Fully Exposed – roofs exposed on all sides with no shelter afforded by terrain, higher structures or evergreen trees
Sheltered – roofs located among evergreen trees or other obstructions within a distance of ten times the height of the obstruction above the roof level from the structure
Terrain Category B – urban and suburban areas, wooded areas, or other terrain with numerous closely spaced obstructions having the size of a single family dwelling or larger
Terrain Category C – flat open country, grasslands above timberline and all water surfaces in hurricane prone regions and any other open terrain with scattered obstructions having a height generally less than 30 feet
Thermal Roof Factor 1.0 – structures that are kept well above freezing with roofs having an R value of less than25
Thermal Roof Factor 1.2 – unheated structures
PSF – Pounds per square foot
Ground Snow Load – The load from snow that has accumulated on the ground. This is the standard used by IBC for permitting. Roof or live load, which is how most yurt manufacturers state their maximum snow load, is generally only 70% of ground snow load.
Call us: 800-288-3190