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About The Petal

The intent of the Materials Petal is to help create a materials economy that is non-toxic, ecologically restorative, and transparent. Throughout their life cycle, building materials are responsible for many adverse environmental issues, including personal illness, habitat and species loss, pollution, and resource depletion. The Imperatives in this section aim to remove the worst known offending materials and practices and to drive business toward a truly responsible materials economy. When impacts can be reduced but not eliminated, there is an obligation not only to offset the damaging consequences associated with the construction process, but also to strive for corrections in the industry itself. Over the past decade, the Red List has transformed the building industry from one where ingredients were held in secret to one where transparency is becoming the new normal.

Net Positive Waste

Our house was built in 1986 and needs major renovation. Windows, doors, siding, roof and deck need to be replaced. We will remodel bathrooms and kitchen and we will replace the existing vinyl floor with a hardwood floor.

We have already begun to disassemble the redwood deck and have used the wood to build a mailbox post and a child's sandbox. We are planning to use more of the reclaimed decking to build raised garden beds, working toward net positive waste as we also increase our home food production in keeping with the Place Petal.

Toxin-free Materials

The two materials making up the bulk of the renovation project will be triple-pane windows by Cascadia and metal siding and roofing from Metal Sales. Both products are toxin-free and can be found on the Living Building Challenge's Declare database, a product directory for healthy building materials.

One example of a common toxic ingredient found in stainless steel and steel coatings is Hexavalent Chromium. In addition to ensuring that our siding and roofing are free of this cancer-causing element, we also chose a toxin-free low flush toilet and designed the construction of our woodstove's steel heat shield to be toxin-free.

Sourcing Locally

The Standard requires that we source a minimum percentage of our building materials (by cost) from within a certain distance of our project location. We are required to source a minimum of 20% from within 500 km, 50% within 1,000 km, and at least 75% within 5,000 km.


All Metal Sales' final assembly location is only 140 km away from the project site. This is why we are able to source approximately 50% of our material budget from within 500 km. However, Cascadia windows will make up 40% of our budget but the final assembly location is more than 1,000 km from us so we would not meet the second sourcing requirement.


We will get an exception to use Cascadia windows due to the overall savings on the home's carbon footprint.  The Cascadia Passive House-certified windows and doors will allow us to reach Passive House standard. A Passive House uses substantially less energy for heating and cooling. Since solar photovoltaic panels come with a carbon footprint too, we can lower our net carbon footprint by reducing the number of solar panels we need, since we will use less energy for heating and cooling.

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Sourcing Sustainably

At least 80% of the wood used in construction must be Forest Stewardship Council (FSC) certified or salvaged. 

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