Page 40 - Green Builder Sept-Oct 2016

Surprising space. The net-zero Arc House’s arches make smaller areas feel much larger.

ABY JULIET GRABLE
T 432 SQUARE FEET, The Arc House
naturally has lower energy demand
than a larger one, especially when it
comes to space heating and cooling.
An energy-efficient envelope, efficient appliances
and smart home technology reduce The Arc
House’s energy demand even further.

ENVELOPE STRATEGIES Net-Zero Energy Features

The unique construction of The Arc House posed some challenges ¦¦ Super-Insulated Shell
for insulating and finishing the structure. A hybrid system consisting ¦¦ Advanced Windows
of polyisocyanurate and closed-cell spray foam insulation was the ¦¦ Efficient HVAC and Appliances
perfect solution for the home’s irregular shape. ¦¦ Integrated Solar with Battery Storage
¦¦ Passive Solar Design
An experienced crew from USI performed the installation of ¦¦ Energy Use Feedback
both the insulation and the roof coating. Two layers of polyiso were
installed against the arched beams and a panelized network of two-
by-fours. Additional two-by-four framing installed to the outside of
the polyiso created cavities, which were filled with approximately
five inches of Bayseal CC X spray foam insulation from Covestro.
Shear panels and another layer of polyiso were installed against the
exterior framing. The curved portion of the structure was covered
with Bayblock HT, a waterproofing acrylic roof coating, which forms
the outermost layer. DuPont Tyvek HomeWrap was installed on the
ends and the straight side of The Arc House to create a weather-

38 GREEN BUILDER September/October 2016 www.greenbuildermedia.com