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What is the R-value of Earth?

Reply: Earth or soil has an R-value of about R 0.25 to R-1.0 per inch at 20% moisture content and other assumptions discussed here. Sand or gravel aggregate has an R-valueof about 0.08 to 0.11 per inch at 20% moisture content or less.

What is the R value of stone?


Material R-Value (ft2 o Fh / BTU)
Stone per inch 0.08
Common Brick per inch 0.20
Asphalt Roof Shingles 0.44
1/2 inch Gypsum Board (Drywall or plasterboard) 0.45

What is the R value of sand?

What is the R value of sand? R-value is the reciprocal of conductivity therefore, the R-value of coarse dry sand = 0.58 1 inch of fiberglass insulation with a conductivity of 0.27 has an R-value of 3.70. Conversely, 6″ of dry coarse sand has an R-value of 3.46; 12″ would have an R-value of 6.92.

How long do rammed earth walls last?

The CMHC estimates the average stick-frame home has a life span of 49 years. A Rammed earth house can easily sustain its integrity for 1000+ years.

How much does a rammed earth house cost?

Even in the Southwest, rammed earth is among the costliest building materials, according to Andy Byrnes, president of the Construction Zone, a Phoenix design-build firm. Prices start at $75 a square foot and can rise well beyond that, depending on the height and complexity of the wall.

What is rammed earth used for?

As the name suggests, the primary material used in rammed earth construction is the earth itself. Rammed earth has a history in the UK and is seen as a traditional form of walling construction. However, it has been used more extensively in recent years by environmentally aware architects exploring natural alternatives.

What embodied energy?

Embodied energy is the total energy required for the extraction, processing, manufacture and delivery of building materials to the building site.

Is Rammed Earth eco friendly?

Healthy and Environmentally Friendly Rammed earth is non-toxic, non-polluting and ‘breathes’. This creates safer, more people-friendly buildings. It is very low in embodied energy, and extremely comfortable to live in.

How long does it take to build a rammed earth house?

How long did it take to build the walls? There were about 28 walls in the house – this included short walls, window walls and non structural walls. In terms of ramming days it took about 25 days as we were able to build two walls in one day on several occasions.

What is a rammed earth floor?

It may seem a bit strange, but a floor comprised of dirt, gravel, straw, sand, and clay, actually has many redeeming qualities. Once it’s been compressed, and sealed with natural linseed oil, a rammed earth floor is quite durable, easy-to-care-for, environmentally sound, and even beautiful!

What is a cob floor?

Cob, cobb or clom (in Wales) is a natural building material made from subsoil, water, fibrous organic material (typically straw), and sometimes lime. The contents of subsoil naturally vary, and if it does not contain the right mixture it can be modified with sand or clay.