Category Archives: Concrete

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

Embodied energy and CO2 emitted in the production of some common items and building materials

Here we have a kilogram to kilogram comparison of embodied energy and carbon dioxide emissions during the production of some common items and building materials.  (The values for gasoline are not embodied energy/CO2 emissions of production, but energy and emissions produced by burning 1 kg of gas.)

Here we move on more specifically to building materials and put them in more recognizable building units.  For comparison, the energy and CO2 emitted in the production of the average American’s weekly food consumption and the energy and CO2 emitted by burning 1 gal of gas are provided.

Next, we compare wall-building materials.  Here we see some growing trade-offs in embodied energy and CO2 emissions, although distinct advantages can be seen in some building materials over others.  (CO2 emissions for Adobe unavailable.)

Finally, some insulating materials (adjusted to different thicknesses to achieve an R value of 10).  Here there are clear winners among the alternative insulating materials.  (Also notice the CO2 emissions differences between HFC-foamed and CO2-foamed polystyrene.)

Data from:

Site Cast Concrete Tile Roof

At the Passive House class Katrin said that the house where she lived in Germany had a very old concrete tile roof. The tiles were cast at the site using a mold. She said that traditionally, the builder would cast a stack of extra tiles and put them in the attic along with a mold so that future owners could cast replacements.

We also watched a movie of a new passivhaus being built there. They used concrete tiles with lugs underneath. The lugs rested on 2×2 nailing strips attached to the roof sheathing. There weren’t any fasteners. She said the tiles interlocked some how, but other than that, gravity was all that kept them in place.

I found an aluminum mold supplier in California: Kinetic Die Casting