The UltraYome™

    

One of the big benefits of the UltraYome is the increased amount that
the roof overhangs the sidewalls. This keeps most precipitation from
dripping onto the walls. Although the classic Yome has more of an
overhang than yurts, it isn't enough to completely keep the drip line
away from the walls. Customers wondered why we didn't just increase
the overhang in the classic Yome and the reason was the upward
wind load. Increasing the amount of overhang has an exponential
affect on the amount of wind the structure has to resist. The
UltraYome had to be highly engineered to offer a full overhang while
resisting this load.

The UltraYome is a true tensile structure. This means that it is a
structure that maximizes the efficiency of tension in addition to
compression to create an extremely strong structure that uses a
minimum of materials. The classic Yome along with yurts have a roof
that is draped into the roof rafters. In the UltraYome the roof
membrane is lifted off the rafters with a double ring-turnbuckle system.
This creates what is known as an anticlastic surface. This harnesses
the strength inherent in the flexibility of a membrane that is curved in
all directions. Through its shape and flexibility the roof fabric can
dynamically respond, absorbing both upward and downward loads
and efficiently transfer those loads to a cable that runs around the
perimeter. In addition, the structure is radial which allows this
perimeter load to be self-supporting.

Another efficient engineering feature of the UltraYome is its cable-
stayed truss system used by all the rafters and top plate poles. Rather
than using heavy thick wooden poles, a truss is created where the
bottom cord is a steel cable. The result again is an extremely strong
support using a minimum of materials. The poles can be fairly
lightweight because the part that is under tension is the cable (which
is really efficient at handling tension).

Overall, most of the UltraYome structure is allowed to flex, absorb and
transfer loads. There is not a need for an additional snow load kit. This
is contrast to yurts where the additional snow load kit consists of
several wood masts under each roof rafter relying primarily on
compression to handle the potential additional load. Furthermore, the
UltraYome roof has a very steep pitch which allows snow in many
cases to slide off.

One of the differences between the UltraYome and the classic Yome is
the base corner brackets. In the classic Yome the base plate poles are
attached together with eyebolts which results in a gap. Although this
gap is sealed with the “fabric flashing” the UltraYome has an
adjustable bracketing system that offers a continuous plate at the
base corners. These brackets can slide to allow a much easier way of
adjusting the fit between the side wall fabric and base plate. In
addition, these brackets offer an advanced system to anchor the
structure to the platform.

A huge benefit of the UltraYome is its ventilation system. The structure
is designed to integrate with the roof insulation to offer a more
comfortable shelter. Just like a yurt, one of the challenges a Yome has
is to stay cool in hot environments. The roof insulation consists of a
draped flame-resistant canvas covering supporting radiant barrier
insulation. There is a lot of space between the roof and the insulation
which creates an efficient convection current that sends the warm air
out the vent in the roof's apex. Furthermore, this convection current
keeps condensation from forming. UV-resistant mesh panels seal the
interface between the roof and sidewalls which allows the convection
current and keeps insects from entering. In extremely cold situations
the mesh can be replaced with insulated panels. However, in all but
extreme cold closing the roof vent and the top of the insulation cover
should suffice.

Furthermore, another feature of the UltraYome is the erection system.
We call it the “Corkscrew System”because the structure twists up into
the air like a corkscrew using a series ratcheting pulleys. This means
it is actually possible for a single person to lift the entire structure in
the air (although we recommend using two people). Furthermore, the
roof and most all the hardware can be ergonomically installed while
the structure is half way up.

Sidewall Height 6’10” Total Height 14’4”