Category Archives: Foundation Systems

Framing and Drainage

Today the framing of the second floor began, and measures were taken to provide proper drainage from the building.

Click here to view the entire Nauhaus Prototype Construction Chronology.

Tim uses a custom-made tool to measure for the Hemcrete.
Tim uses a custom tool to measure for Hemcrete.

David Madera stopped by to discuss Hemcrete.
David Madera stopped by to discuss Hemcrete.
A strip drain is placed at the bottom of each wall.
A strip drain is placed at the bottom of each wall.
Gravel is shoveled into the Eastern trench.
Gravel is shoveled into the Eastern trench.
East Wall
Wast Wall Framing

Concrete Scoring and Hemcrete Testing

Today, the concrete slab was scored on a three foot grid, to prevent cracking.  David Madera and Greg Flavell of Hemp Technologies also helped us to perform a full-size Hemcrete test.

Click here to view the entire Nauhaus Prototype Construction Chronology.

Scored Concrete Slab
Scored Concrete Slab
Scored Concrete Slab
Scored Concrete Slab
Hemcrete Mix
Hemcrete Mix
12" Hemcrete Form
12" Hemcrete Form

Completed 12" Hemcrete Wall
Completed Hemcrete Wall

Concrete Slab and Storm Drain

Today, JBS Construction came back to pour the concrete slab over the vapor barrier.

Click here to view the entire Nauhaus Prototype Construction Chronology.

JBS places a matrix of rebar over the hardened foam.
JBS places a matrix of rebar over the hardened foam.
Concrete Pour in Mechanical Room
Concrete Pour in Mechanical Room
Jeff and Jackson Buscher
Jeff and Jackson Buscher
JBS Smoothing the Slab
JBS Smoothing the Slab

Slab at Corner
Slab at Corner
New Storm Drain
New Storm Drain
New Box for Replaced Storm Drain
New Box for Replaced Storm Drain

Foam Insulation Sprayed

Today, Home Energy Partners came out to spray the closed-cell insulation for the slab and exterior walls.

Click here to view the entire Nauhaus Prototype Construction Chronology.

Advantek sheathing and brick mold are installed first to stop the foam and eventually to support the Hemcrete.
Advantek sheathing and brick mold are installed first to stop the foam and eventually to support the Hemcrete.
Brick Mold Installation
Brick Mold Installation
Home Energy Partners Spraying North Wall
Home Energy Partners Spraying North Wall
Home Energy Partners Spraying North Wall
Home Energy Partners Spraying North Wall
Home Energy Partners Spraying Underslab Foam Insulation
Home Energy Partners Spraying Underslab Foam Insulation
Home Energy Partners Spraying Underslab Foam Insulation
Home Energy Partners Spraying Underslab Foam Insulation
Spray Foam Insulation around Ground Loop Stub-out
Spray Foam Insulation around Ground Loop Stub-out
Spray Foam Insulation on CMU
Spray Foam Insulation on CMU

Gravel and Vapor Barrier

Today, another 20 mil. vapor barrier was spread over gravel, in preparation for the insulation and concrete slab.

Click here to view the entire Nauhaus Prototype Construction Chronology.

Drain and Insulation with Gravel
Drain and Insulation with Gravel
Finished Gravel
Finished Gravel

Vapor Barrier at CMU
Vapor Barrier at CMU
All penetrations through the vapor barrier are carefully sealed.
All penetrations through the vapor barrier are carefully sealed.

Finished Vapor Barrier
Finished Vapor Barrier



Vapor Barrier Under Footers

Today a 20 mil. vapor barrier was laid in the trenches.  The concrete footers will be poured on top.   Radon pipes were installed for future venting if necessary, and greywater pipes were stubbed-out in hopes that one day a legal greywater system will be possible.

Click here to view the entire Nauhaus Prototype Construction Chronology.

View of Completed Vapor Barrier from Southwest
View of Completed Vapor Barrier from Southwest

tim vapor barrier
Tim Callahan
Stubbed-out Radon and Greywater Pipes
Stubbed-out Radon and Greywater Pipes

Foundation Capillary Breaks

Building Science Corporation:

The theoretical limit of capillary rise in concrete is about 10 kilometers—and folks that is not a typo—it really is about 10 kilometers or about 6 miles. Concrete sucks big time. In wood it is about 400 feet—the height limit trees can grow to is set by the size of the capillary pores in wood. Ever wonder how leaves get water? When you go into a forest and listen very carefully you don’t hear any pumps pumping water upwards a couple of hundred feet do you? Capillary suction is powerful stuff. When you add salt to the water the power becomes explosive—literally as we shall see…

The article goes into detail about using lime mortar as a sacrificial layer to protect brick, and detailing foundations to direct capillary water to the outside.

:: BSC | Capillarity—Small Sacrifices