FAQ Friday: What are Silicate Paints?

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Silicate Dispersion Paint is also known as Inorganic Mineral Paints and is unique in regard to its ability to breathe and supply a long service life to masonry materials. Chemical mineral paints are based on “Waterglass” AKA Potassium Silicate, which has been described as liquid stone. When silicate Paint petrifies a mineral substrate such as brick, stone or concrete, it chemically bonds to not only the surface but also beneath. Upon curing, called Silicification the paint becomes part of the substrate, forming a micro-crystalline coating. Because silicate paint becomes one with the substrate it will mimic the natural water vapor transfer and cannot blister or peel due to the laws of chemistry.

Learn more about silicate paints here

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Repointing A Historic New Jersey Home

Historic masonry restoration completed by the Technical Install Team of LimeWorks.us in Moorestown, New Jersey. This circa 1790 historic brick home was repointed using Ecologic™ Mortar. Ecologic™ Mortar is made with Natural Hydraulic Lime (NHL) and contains NO harmful Portland Cement. The use of Portland Cement to repoint historic buildings will cause premature degradation which may include spalling of historic bricks, moisture build up within the walls, damage from salts, and poor water vapor transmission. Water trapped within masonry walls may negatively encourage moisture issues to begin within the building including mold, mildew, and interior wall damage as well as increase heating and cooling costs.

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What is especially unique about this repointing job is that the entire front façade was found to have remnants of the original white highlighting done within a narrow keyway incised into the center of the joint work. Many photos in the video correspond to the side walls which were simply repointed using the Natural Hydraulic Lime and sand Ecologic™ Mortar struck flat and having no such embellishment. However, the front was accurately reproduced with the highlighting work which is referred to historically as “Penciling.” To learn more about the methods and materials used for appropriate historic masonry restoration visit LimeWorks.us.

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Restoration Well Underway at the University of Virginia

The prestigious Lawn at the University of Virginia is currently in the middle of an enormous restoration campaign. This past summer and fall, the sod was completely replaced to allow for a new drainage system. All of the 105 chimneys were repaired using LimeWorks.us custom Ecologic™ Mortar. Removal of the decades of damaging mortars that had been installed during the mid 20th Century, that may have inappropriately contained Portland cement were replaced with the Pure and Natural Hydraulic Lime (NHL) based mortars provided by LimeWorks.us. Ecologic™ Mortars contain no inappropriate Portland cement or Ground Granulated Blast Furnace Slag, (GGBS), used in HL and not found in the original historic mortars.

Each of the 10 pavilions and 54 student rooms received their repaired chimneys this past summer during a repair campaign that was prompted in part by the east coast earthquake in August, 2011.

The mortar used for this repair, and a number of other ongoing repairs across the lawn, is not only a compatible mortar possessing important properties like breathability and a proper compressive strength, but it is also by nature environmentally friendly. Natural Hydraulic Lime releases approximately 80% less carbon dioxide into the atmosphere compared to the manufacture of Ordinary Portland Cement and NHL does not off-gas like Hydraulic Limes (HL) containing GGBS. NHL continues to absorb CO2 from the atmosphere during its entire lifecycle moving it closer to being carbon neutral.

Watch the video above to see more about the restoration taking place at UVA and keep up to date with us to learn about the ongoing historic restoration campaign at Thomas Jefferson’s Academical Village.

Video courtesy of UVA Magazine

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FAQ Friday

Two weeks ago I attended The 12th International Congress on the Deterioration and Conservation of Stone in New York City. It was four days long, jam packed with presentations that covered geology, physics, material science, engineering, chemistry, biology, architecture, and conservation. During this time I took lots of notes thinking that I may never be able to access this consolidated wealth of information again. Fortunately I checked up on the website and noticed to my surprise that not only are all the abstracts available but also the research papers that were presented. The amazing thing is that all this information in FREE. So geek out and enjoy.

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Limelight on Historic Brownstone Restoration – Alfred’s Victorian

Alfred’s Victorian Restoration Story –  with Andy deGruchy

Alfred's Victorian Staff
Alfred’s Victorian Staff

 

This beautiful late 19th century Hummelstown brownstone was recently restored by deGruchy Masonry Restoration, the Technical Install/Training Team of LimeWorks.us. Using historically appropriate, breathable Natural Hydraulic Lime based materials for repointing the brickwork and repairing the brownstone, this iconic building is now put into an excellent state of conservation. It remains a testament to excellent stewardship of our built heritage thanks to the owner, and lifelong resident of Middletown, PA, Robin Pellegrini.

Taking an architectural conservator’s approach, the team of masons repaired the broken and missing pieces of historic sandstone and lime mortar with environmentally friendly Ecologic® Mortar and Lithomex Brick and Stone repair material. The team retained as much of the historic fabric as possible by repairing what could be salvaged with these specialty materials. These materials allow the building envelope to process water out naturally through the lime and sandstone because of their effective liquid/vapor transfer properties over any patch material based on Portland cement.

Please take a look at our other videos for the full extent of this remarkable restoration:

True Sustainable Development in Historic Restoration  – Alfred’s Victorian –  Randy Ruth

Restoring Historic Alfred’s Victorian Brownstone  –  Randy Ruth

Natural Hydraulic Lime Mortars for Historic Preservation and Their Impact on the Environment –  Randy Ruth

 

Presented by LimeWorks.us
Phone: 215-536-6706

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Replica Lithomex Brick for Charleston Old City Jail

The 2012 APT/ IPTW Joint Preservation Conference is almost here. We’ve been busy preparing for the workshop we’ll be participating in at the Old City Jail (American College for the Building Arts). Check out this video of Randy preparing some replica brick made of Lithomex for the workshop.

Also, keep any eye out for blog posts this weekend and next week from Charleston. We’ll be working not only at the Old City Jail but also at the Second Presbyterian Church to preserve a section of the historic wall along Charlotte Street.

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Mineral Paints and Stains Make a Breathable and Durable Mural on a Historic Building

  • 1 man
  • 560 hours
  • 28 days
  • 1 Beautiful/ Durable/ Breathable Mural

Jim Gloria of the Totts Gap Art Institute completed the first of the murals for the Bangor Heritage Mural Project in Bangor PA. Using breathable silicate paints and stains, Jim created a beautiful piece of art that will succeed and stand strong against sun rain and snow for decades to come. These silicate paints and stains also will allow the historic building it is painted on to allow the building to continue to breathe as it was meant to. The white base coat allowed for a clean surface to start with followed by the artistic application of multiple colors over 6 1/2 weeks to complete this masterpiece. Follow through the photos below to see the evolution.

If you’re interested in learning more about silicate paints and stains please visit us here: limeworks.us/ecologic-paint

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Conserving A Pennsylvania Treasure, New Hope’s Historic Parry Mansion

The Parry Mansion located in downtown New Hope Pennsylvania is one the finest relics of the river town’s historic past. Benjamin Parry, founder of New Hope, spent three years constructing his 11 room home from Bucks County fieldstone. Recently, the Technical Install Team of LimeWorks.us , (deGruchy Masonry Restoration), used a conservator’s approach to preserve the building’s historic masonry fabric.

They removed and disposed of all Portland cement repairs carried out over the last 200 years. They then removed only the original lime mortar that was broken and ready to fall out. They saved it and reconstituted all retained aggregates back into a new replacement lime mortar. The team put the salvaged aggregates back into the replacement mortar which consisted of Natural Hydraulic Lime (NHL) and more of a similar gradation of commercially available sands.

They did this to maintain the authenticity of the building which had over 60 % of its original 1794 lime mortar still intact. The 60% of historic lime mortar that remained was not in need of being disturbed since this old lime mortar was still in great shape and ready to deliver another 100 years of service without any intervention other than to leave it alone. By folding back into the building the reclaimed, and hard to acquire, aggregates they accomplished a conservation effort second to none. This made the stewards of this museum house very happy.

On a green note, it also happens that the reduced amount of building material waste and the need for larger amounts of new material and energy was not required. The custom Ecologic™ Mortar mix that LimeWorks.us finally created after a dozen samples with various hue changes was initially made to match the remaining original lime mortar was completed in May 2012.

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Historic Brownstone Restoration With Breathable Natural Hydraulic Lime

This beautiful late 19th century brownstone was recently restored by deGruchy Masonry Restoration, the Technical Install/Training Team of LimeWorks.us. Using historically appropriate, breathable Natural Hydraulic Lime based materials for repointing the brickwork and repairing the brownstone, this iconic building is now put into an excellent state of conservation. It remains a testament to excellent stewardship of our built heritage thanks to the owner, and lifelong resident of Middletown, PA, Robin Pellegrini. Taking an architectural conservator’s approach, the team of masons repaired the broken and missing pieces of historic sandstone and lime mortar with environmentally friendly Ecologic™ Mortar and Lithomex Brick and Stone repair material. The team retained as much of the historic fabric as possible by repairing what could be salvaged with these specialty materials. These materials allow the building envelope to process water out naturally through the lime and sandstone because of their effective liquid/vapor transfer properties over any patch material based on Portland cement.

The building is located at 38 N Union Street in Middletown, PA. It is the home of The Alfred’s Victorian Restaurant. The brownstone building was originally built in all its opulence for the purpose of demonstrating the Victorian era extravagance and wealth of the owner at the time. Construction was completed in 1888 using Hummlestown brownstone from the famous nearby quarry. Unfortunately, before the year 1900 it was repossessed from the owner by the Middletown National Bank and subsequently sold to its second owner for $6,600.00.

While the interior went through many renovations, the exterior remained mostly untouched. Over the years, the brownstone weathered and many of the beaded mortar joints cracked and wore down flush with the stone. For this repair campaign, Ecologic™ Mortar in color code DGM BLACK was used to repoint the missing or damaged joints. Where historic black-colored lime mortar was intact in all of its beaded profile, but only the original lamp black pigmentation faded out, QuartzGuard Silicate Paint, which was made to match Ecologic™ DGM BLACK Mortar, was applied over the joints to blend the colors of the old and new together for a beautiful and striking contrast to the chocolate colored Hummelstown Brownstone. The custom shade of Lithomex was formulated so that the Hummlestown Brownstone elements which eroded away could be rebuilt. This included the ornate egg and dart details which were re-carved by the deGruchy Masonry Restoration team over the windows and at pillars and other locations.

Here are a few photos of the restoration process. If you live nearby, stop by Alfred\’s Victorian and say hi. The food is great so plan to try one of their delicious locally grown, organic meals.

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Favorite Books on America’s Building Heritage and Masonry, FAQ Friday

While it may not be directly in front of you, information about our building heritage in the United States and countries around the world is available for free or next to nothing. Understanding the materials used in masonry construction over time can be a complex thread of knowledge. In short, as people change over time, so do the methods and materials. Fortunately, there is a lot of documentation from the past 200 years that can bring to light some of the questions masons, contractors, architects, and inquisitive people have about what’s up with masonry mortars of today and the recent past. Some books are well rounded with practical information. Other books give information as a raw resource to discover where and how mortars were made and others are so technical, they can put you to sleep. However, the following books are some of the best I’ve found to help expand your personal knowledge on lime, cement and what really makes up most all mortars.

Ian Cramb’s first and second books, “The Art of The Stonemason” and “The Stonemason’s Gospel” are excellent reads. The balance of a personal story, masterfully illustrated technical drawings of stone wall construction and practical tips all come together to provide for a real education to anyone with an appreciation or interest in stone.

Another Great book is “Building With Lime: A Practical Introduction”. This was the first book I ever read about lime and its enormous roll in masonry. The book title says it all. For someone just starting to expand their masonry knowledge of lime mortars, it is an invaluable resource.

All three books are available on Amazon.

Other more in-depth books about manufacture and sources of raw ingredients can be found for free by searching Google books. Here is a list of some good ones.

Hydrated lime by Ellis Warren Lazell
History of the Portland cement industry in the United States by Robert Whitman Lesley

Natural Stone, Weathering Phenomena, Conservation Strategies and Case Studies: edited by Siegfried Siegesmund, Thomas Norbert Weiss, Axel Vollbrecht

Masonry Construction: By American School of Correspondence, Chicago, Alfred Edward Phillipps, Austin Thomas Byrne

Cements, Limes, and Plasters by Edwin Clarence Eckel

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