Living Craft’s work at The Bindery Restaurant in Denver was recently featured in an article in Modern in Denver magazine. The focus is on the sustainable and cultural elements that the owner, Linda, brought to her new business venture. Our custom traditional lime plasters are one component of the sustainability practices that they prioritized during their design and build process. Read the full article to find out more, or stop by for an up close look at the walls.
The Ties That Bind
“Lime Plaster is a natural product. It’s a true craftsman’s product… it’s more alive than stucco. It allows light to interact, to dance.”
Living Craft Design has been working on a straw bale addition to our friends’ home in Boulder. This family is already well-versed in the benefits of natural building, so their addition incorporates passive solar heating with large, south-facing windows and a concrete slab floor to hold all that sun-generated heat. The addition has the high insulation value (R-value) that is a great feature of straw bales as a building material. Additionally, the family chose to renovate the original rooms of their home and filled the walls and ceilings with densely-packed blown cellulose as part of that process. This home will be comfortable year-round and have low energy bills as well as a reduced need for running heating and cooling systems.
A Straw-Cell Design
We jumped into the project starting with straw bale installation. This house has what’s called a straw-cell wall, with an entire wall system behind the bales, complete with wood studs, recycled denim insulation, and exterior wood siding. The bales then are stacked on the inside of this wall, meaning that labor is reduced because you don’t have to cut or trim as many bales to fit within and around the walls’ wood frames. You also only need to apply plaster to the interior side of the bales.
A great thing about the insulation materials used in this home is that they are all carbon-based, and will now be locked away in the walls of this home for a very long time. This is actually a form of carbon sequestration, one technique to keep atmospheric carbon down and help mitigate climate change. This is in direct contrast to insulation materials like foam, fiberglass, and mineral wool, which consume a lot of energy to create. This means that the manufacture of those materials produces a lot of greenhouse gas emissions, upping their carbon footprint.
Healthy, Natural Plasters
Our next step was to start the plasters. A base coat of local red clay was applied to cover the bales first. At a fun summertime work party hosted by the family, we added a leveling coat which will provide the base and shape for the finish plasters. We introduced some folks to the techniques and tools for mixing and applying natural clay plasters and played in the mud with good friends. We also started to build out the windowsills into their final shape using a lime and clay mixture with lots of straw for strength.
The final wall finish was customized to get the exact color and texture that our clients wanted, and this last, thin layer of clay-based plaster went on like a dream. Thanks to additions like wheat paste, it dries into a hard and durable finish that will last for years, and also be easily reparable in case of accidental damages.
During the wall finish process, we were preparing for and creating the tadelakt windowsills that will become perfect benches for sitting on and reading in the natural light. This Moroccan finish plaster is created from lime, which is why the base coat for the sills incorporated lime with the clay. This results in a tight bond between the materials. The smooth layers of lime were applied, soaped, and burnished using stones to create a shiny finish. The sills were then waxed as the final step to create a long-lasting surface that can withstand some use.
The End Result: A Beyond Green Building
We’re departing this project with lots of hope for the future which will unfold in this family’s happy, healthy, non-toxic, and environmentally friendly home. Not only will it be a beautiful space to raise a family, but also a good model for other front range homeowners looking to sustainably add some space and renew their original home.
Our clients for this project had finished building their own straw-bale home in the mountains west of Boulder about a decade ago. However, the harsh mountain climate and some details of the design and material selection had led to failures in areas of plaster, particularly around windows and in places where the roof drainage lacked adequate gutter systems.
We worked with them to come up with a solution that would allow them to participate in the repair work, while using our experience and tools to speed up the process and get the home ready for winter.
First steps were to remove the lime plaster where it had begun to delaminate from the clay plaster base coat below. This happens because of a reaction between the two materials that creates a silt layer which prevents them from bonding, weakening the walls. In some areas, water had eroded the clay base coats, and we needed to mix and apply a clay plaster to build out everything to the same level. Next, we mixed up an intermediate lime-stabilized earth plaster to apply on top of the clay base coat. This in-between layer helps bond the two materials by creating a transition. The homeowners applied both of these layers by hand after we mixed up several batches and staged them around the house. They also took the opportunity to enhance and add some sculptural elements, including the house number in relief on the side of the wall.
We also added metal flashing around windows and below siding to move any water running off the building out to the surface of the wall and keep it from infiltrating into the plaster again. A final sponge-finished lime plaster over the whole house covers up any differences between the old and new and seals boundaries to prevent water from eroding the surface.
We will be able to go back in the spring next year, once temperatures are consistently above freezing, to apply a final colored coat over their home. This entire process will ensure that the will last for many decades to come, even in the harsh mountain winters.
We tackled a big project earlier this year with the complete remodel of a bathroom in Denver. The bathroom had been updated back in the 1990s, and it definitely looked a little dated. More problematic, there were moisture issues which resulted in peeling wallpaper, water stains in the foyer below, and the potential for greater damage. The homeowner needed an update, not only in the style of the bathroom, but also with its functionality!
We worked with our client’s needs and desires, and came up with a modern new layout and design that incorporates lime plasters, including Moroccan tadelakt for use in the shower and custom built sink basin. Also new are the coordinating wooden cabinets, trim, and door, and large format tiles on the walls and floor, plus pebble tile in the shower basin.
For improved building performance, we installed a new motion-detector equipped ventilation fan to move moisture to the outside of the home, fully waterproofed the shower walls and floors, and added blown cellulose and improved air sealing in the attic. An energy audit, performed both before and after upgrades, confirmed that the home will now have lower heating and cooing costs. These performance upgrades also allowed the homeowner to claim a rebate with their energy company.
Check out some of our before and after shots to see the differences!