Introducing a net-zero energy use home, built with our future in mind.

With simple gabled roof forms, cedar shingles, and metal roofing, the new net-zero all-electric ocean-front residence will integrate with the Cape style houses of the surrounding Harwich Port neighborhood.
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Behind the cedar shingles, the house uses a combination of new and traditional building methods and materials to cut embodied carbon, reduce energy use, and improve environmental and occupant health.

Chief among them is a biocomposite called hemplime (also known as hempcrete) that replaces plywood sheathing, synthetic house wrap, and spray foam insulation. In addition to providing thermal resistance (R-Value), hemplime wall and roof assemblies improve indoor air quality, buffer heat and moisture, are fire, mold, and pest resistant, inherently air-tight, and sequester carbon.
Building with hemplime using conventional methods typically takes weeks, but takes just a fraction of the time using an innovative high-production European spray-applied system. When completed, this project will be the first in North America to employ this system.
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The landmark residence is designed to be net-zero energy use, and incorporates the following materials and systems:

Near zero use of petroleum-based foam insulations. Substitutes include foamed glass aggregate subgrade insulation (100% recycled material), hemplime, mineral wool, vacuum panels, and recycled denim acoustic insulations.
Vapor-open hemplime wall and roof assemblies with sidewall cedar shingles and zinc standing seam roof cladding.
Pile and grade beam + pier foundation design allows the house to be lifted in the future for flood resilience.
High-efficiency HVAC with a fully distributed fresh air system.
15kW PV array system, whole-house backup battery ready.
Domestic and local materials including eastern white cedar shingles, Appalachian black locust decking, triple-paned wood windows.
Healthy building materials including high fly ash / slag concrete mix with reduced use of Portland Cement; avoidance of pressure treated lumber where chemical leaching into coastal aquatic environment could occur; minimal use of polyvinyl chlorides through the use of ABS and other substitutes for piping; and low or no VOC finishes and sealants.
Native plantings landscaping.

Project Team

STRUCTURAL ENGINEER
Structures Workshop
MECHANICAL AND ENERGY ENGINEER
ZeroEnergy Design
HEMPLIME CONSULTING
Kiko Thébaud Architecture, Laurent Goudet AKTA - BVP
HEMPLIME CONTRACTOR
HempStone
CIVIL ENGINEERING
Ryder & Wilcox 
HEMP PLASTER CONSULTING
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DuChanvre 
LIGHTING DESIGN
Lana Nathe, Light Insight Design Studio
AV & LOW VOLTAGE
AVDG, Josh Kiernen Technology Planning
GENERAL CONTRACTOR
C.H. Newton Builders