Lightbox 23 net zero House, Portland Building, Sustainable Home, Oregon Real Estate, US Property Images

Lightbox 23 net zero House in Portland

Real Estate Development in Oregon design by Steelhead Architecture, USA

post updated November 4, 2022 ; Aug 14, 2018

Design: Steelhead Architecture

Location: Portland, Oregon, USA

Lightbox 23 net zero House

Lightbox 23 Net Zero House in Portland

Photos by Josh Partee

Lightbox 23 net zero House

Lightbox 23 is a 2-unit net zero infill project in inner NE Portland. The project features super insulated wall, roof and sub-slab assemblies plus high performance mechanical and ventilation systems. Topping it off (literally) is a 10kW solar array on each unit. The project has been certified net zero by Earth Advantage.

Lightbox 23 Net Zero House in Portland

The design is a split level floor plan with the floating stairs acting as the central spine. Each floor opens to the half level above and below through the open slot the stairs create. The exterior tube forms step up the facade to the corner view deck where Mt. St. Helens and Mt. Adams are visible to the north. Being a corner lot each unit faces a different street and the plans / facades are mirror images of each other.

Lightbox 23 Net Zero House in Portland

Lightbox 23 is a speculative project by Lightbox Portland, who is dedicated to high performance, high density modern development. 3 more Lightbox Portland / Steelhead Architecture projects are currently in process.

Lightbox 23 Net Zero House in Portland Lightbox 23 Net Zero House in Portland

Net zero construction simply means generating as much, or more, energy as is used by the building. On the supply side this means a 10kW solar array for each unit. That’s the easy part. Reducing the energy load is the more interesting part of the equation. Super insulation is a huge part, and relatively inexpensive.

Steelhead Architecture used 2×8 walls filled with blown in cellulose then added 2″ of EPS (rigid insulation) to the outside of the plywood / WRB for a thermal break. There are 3″ of EPS below the concrete slabs (no crawl spaces ever used). The roof assembly is similar to the walls with the combination of blown in and rigid insulation for a ventless assembly.

Lightbox 23 Net Zero House in Portland

Our air barrier is another huge piece. Steelhead Architectureused Henry Blueskin as the WRB and air barrier over plywood (no OSB). With repetitive joint sealing and searching out leaks Steelhead Architecture achieved a blower door test of 2.36 ACH50 (air changes per hour at 50 pascals of pressure) which is 4-5 times better than an average house. All of these tight and super insulated envelope measures equals very little heat / cooling loss and therefore much less energy use.

For the mechanical system the architects used ducted heat pumps – all electric which have far greater efficiency the gas systems. There is in fact no gas used on site at all, again to increase efficiency and reduce penetrations. The system also includes an independently ducted HRV (heat recovery ventilator) to provide controlled air exchanges without losing energy.

Lightbox 23 Net Zero House in Portland Lightbox 23 Net Zero House in Portland

Lightbox 23 net zero House, Portland, OR – Building Information

Project size: 5800 ft2
Site size: 5000 ft2
Completion date: 2018
Building levels: 3

Design: Steelhead Architecture

Lightbox 23 Net Zero House in Portland

Photography: Josh Partee

Lightbox 23 net zero House in Portland images / information received 140818 from Steelhead Architecture, USA

Location: Portland, Oregon, United States of America

Oregon Buildings

New Architecture in Oregon

Oregon Architecture

Skyline Residence, Skyline Boulevard, Portland
Design: Nathan Good Architects
Skyline Residence in Portland
photo : Jeremy Bitterman Photography
New Residence in Portland

Trout Lily Screen Porch Trout Lily Vineyard, Newberg, Yamhill County
Design: beebe skidmore architects
Trout Lily Ranch Oregon
photo from architects
Trout Lily Screen Porch

Siskiyou House, Alameda-Beaumont, Portland
Design: Beebe Skidmore Architects
Siskiyou House
photo : Bruce Wolf Studio
Siskiyou House Oregon

American Houses – Selection

Home 901, Sabino Springs, Tucson, Arizona
Design: Kevin B. Howard Architects
Home 901 in Sabino Springs Tucson
photograph : Matt Winquist and Robin Stancliff
Sabino Springs House

New Houston House, Louisiana
Design: Viviano Viviano
Family HQ House in Houston
photo : Peter Molick and Jack Thompson
New Houston House

Contemporary Houses

Website: Portland’s West Hills

American Architecture

American Architects

Original Restaurant Oregon

Net Zero Carbon Buildings News

Contemporary Green Architecture Design – selection of posts:

Net Zero Energy House, Cupertino, California, USA
Design: Klopf Architecture
Net Zero Energy House California
photo : Mariko Reed
Net Zero Energy House: California Residence

Net Zero Carbon Buildings
Net Zero Carbon Buildings, Sustainable Architecture
photo courtesy Anders Vestergaard Jensen, unsplash

Net Zero Office Building

Atkins heat decarbonisation study: Net Zero Carbon

Zero-carbon Interiors

Zero Carbon Buildings 2050 Report

House of Lords Zero Carbon Homes Ruling

2020: The Year of Net Zero
Sustainable Buildings Research Centre, University of Wollongong
photo © Richard Glover / Matt Estherby
Sustainable Building News: Zero-Energy

Comments / photos for the Lightbox 23 net zero House in Portland, Oregon, design by Steelhead Architecture USA page welcome