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Natural Hydraulic Lime – Creates Old-World finish That is a Perfect Finish Selection for Wood-Fired Ovens, Foundations, and Other Masonry Projects

June 21, 2011 1 comment

Many buildings over 100, even thousands years old built with Natural Lime, sand and pigment exemplify sustainability

The ARCH, known in part for it’s natural finish options, has recently gained more experience with a Natural Hydraulic Lime finish product that we offer.  Jim Erskine’s masonry experience spans thirty plus years, and as with most masons, his experience over the years has been primarily with Portland Cement products.  Since  2004 Jim began working with American Clay’s natural interior earth plasters and has since become a strong advocate for all natural finish products.  We’ve learned  Natural Hydraulic Lime is retaking its place on  historic masonry structures, and it is of increasing interest for  a wide range of masonry applications.  Recently we’ve enjoyed two applications on Forno Bravo wood-fired ovens as well as a residential wall foundation.  We’re thrilled with the more natural look, as it takes on the nuances of color from the sunlight of the day and we know it will improve with age and develop a character unlike a traditional cement stucco.

Limeworks products

Not pretending to be an expert on the properties of all the St Astier’s product options I can point you to a Chicago Tribune/ Washington Post interview with Andy deGruchy, president of Limeworks.US  since 2001 and masonry conservation specialist for over 25 years.

DGM Color Kit for Ecologic Lime Mortar prepared with NHL and sand

You’ll learn the difference between hydrated lime and natural hydraulic lime among other interesting historical aspects and views within the construction industry as they relate to lime products. Jim and I first met Andy here in Asheville, as he was demonstrating the application of Natural Hydraulic Lime (NHL) products over the Hemp Technologies Hempcrete wall sections, of which we have a wall portion displayed in our showroom. NHL breathes with wall systems as they should, not trapping the moisture into cracks and crevices that are a result of concrete construction over time, weakening the structure. Natural Hydraulic Lime is found on some of the oldest historic structures on this earth.  Featured here are a few photos from three recent projects . The first being a wood-fired oven of Rich and Kelly Lytle of North Asheville.

Lytle Residence of Asheville with Natural Hydraulic Lime plaster

This is a Forno Bravo Casa2G90 oven kit, it has high heat refractory cement applied to the joints, high heat retention insulation, lathe, mortar mix, two coats of Ecologic Lime (which is a pre-blended Natural Hydraulic lime including the sand and pigment).  The oven foundation work, oven assembly, oven finishes are all completed by Jim and Tom Silver. The attractive natural stonework is by local stone craftsman David Reed.  The second oven, is our  “slow but sure  progress” on our own oven (still awaiting tile for the arch, counter surfaces and lower stonework).

Oven in progress. Natural Hydraulic Lime- still drying

We chose to add American Clay pigment – two  color packs of Palomino Valley pigments to one bag of NHL 3.5 as a final coat to the process.

Burlap is used to retain the moisture while the St Astier pure and Natural Hydraulic Lime dries.

Lastly, the foundation photos are for a home in the area. Covering a block wall,

Block wall before application

a coat of NHL 3.5 was applied, then the Ecologic pre-blended Natural hydraulic lime.

The appearance is much more natural and appealing than cement stucco. As with the other projects it will continue to harden over the months to come.

Natural Hydraulic Lime finish

For more information on these products as well as natural lime paints, give us a call at The ARCH at 828 253 5455.

You can also look over www.limeworks.us for more information. A discount is provided to buyers if you use The ARCH code.   Give us a call and we’ll gladly provide you with information as well as our code for a product discount.

Application over block foundation wall with NHL 3.5 and Ecologic DGM100