Most homeowners assume that because their home passed inspection, it is safe. After 20 years in the renovation industry, I can tell you with absolute certainty: inspection does not mean safe. The materials used to build the average American home were never tested for long-term indoor exposure. They were tested for structural performance, fire code compliance, and moisture resistance — not for what they release into the air your family breathes every single day.
This is the complete toxic building materials list. Every item on this list is currently found in millions of American homes. If you own a home built in the last 60 years, most of these are almost certainly inside your walls right now.
Spray Foam Insulation
Spray polyurethane foam (SPF) is one of the most aggressively marketed insulation products in the construction industry. It seals air gaps effectively and has high R-values. It is also one of the most chemically complex materials installed in homes today.
During and after installation, spray foam releases isocyanates — a class of chemicals that are among the leading causes of occupational asthma. It also contains amine catalysts, flame retardants, and blowing agents. The EPA has documented that improperly mixed or applied spray foam can off-gas for years. Yet it is installed in millions of homes by contractors with minimal chemical safety training.
Fiberglass Batt Insulation
The pink stuff in almost every American home is made from glass fibers fine enough to become permanently airborne when disturbed. Once airborne, they lodge in lung tissue. Standard installation requires respirators, goggles, and full-body protective clothing — equipment that most homeowners never think about when they are simply living in the house where this material was installed.
Gypsum Drywall (Standard)
Standard drywall contains synthetic gypsum — a byproduct of coal plant emissions captured from power plant smokestacks. This flue-gas desulfurization gypsum concentrates heavy metals including mercury. When drywall is cut, sanded, or damaged, it releases these compounds as fine dust. Drywall also absorbs moisture readily, making it one of the primary substrates for toxic mold growth inside walls.
Vinyl and LVP Flooring
Luxury vinyl plank flooring has dominated the remodeling market for the last decade. It is durable, waterproof, and affordable. It is also made primarily from polyvinyl chloride — PVC — which contains phthalates, a family of plasticizers linked to hormone disruption, developmental damage in children, and reproductive toxicity. New vinyl flooring off-gasses these compounds into indoor air for months or years after installation.
Pressed Wood Products (OSB, Plywood, MDF, Particleboard)
The structural skeleton of most American homes is made from engineered wood products bonded with urea-formaldehyde resins. Formaldehyde is a known human carcinogen classified by the International Agency for Research on Cancer. It off-gasses continuously from these materials for years, with higher temperatures accelerating release. MDF and particleboard used in cabinetry, furniture, and subflooring are among the highest-emitting sources of indoor formaldehyde in the home.
Conventional Paints and Finishes
Standard latex and oil-based paints, stains, and varnishes contain volatile organic compounds — VOCs — that evaporate at room temperature into indoor air. These include toluene, benzene, xylene, and ethylbenzene, compounds associated with neurological damage, liver toxicity, and cancer with chronic exposure. The "new paint smell" that many homeowners associate with a fresh renovation is the smell of VOCs off-gassing.
Carpet and Carpet Padding
New carpet contains over 40 documented chemicals, including 4-phenylcyclohexene (4-PCH), which produces the characteristic "new carpet smell," along with styrene, acetaldehyde, and various flame retardants. Carpet padding made from recycled synthetic foam off-gasses its own set of compounds. Carpet also traps and concentrates dust mites, mold spores, pesticide residues, and heavy metals tracked in from outside — releasing them back into air with every footstep.
Flame Retardant Chemicals (PBDEs and Alternatives)
Polybrominated diphenyl ethers were used as flame retardants in furniture foam, carpet backing, and electronics for decades before being phased out due to documented links to thyroid disruption, neurodevelopmental damage, and cancer. Their replacements — organophosphate flame retardants — are now under similar scrutiny. Both migrate out of the materials they are added to and accumulate in house dust, where they are ingested by children and pets.
Pipe Materials (PVC and Older Copper)
PVC pipes used in plumbing systems can leach phthalates and other stabilizers into water. Older homes with copper pipes soldered with lead-based solder present a different risk — lead leaching directly into drinking water, as seen in Flint, Michigan and in hundreds of similar situations across the country that never made headlines.
What to Do About It
Knowing what is in your home is the first step. The second is replacing it systematically with bio-based, non-toxic alternatives. GaiaCrete® and hemp fiber batts replace spray foam and fiberglass. Natural lime plaster replaces drywall on interior walls. VOC-free mineral paints replace conventional paint. Solid wood or cork flooring replaces vinyl. Non-toxic adhesives replace formaldehyde-laden binders.
This is exactly what the Mr Hemp House Healthy Home Assessment was built to do — identify every toxic material category present in your home and give you a prioritized, room-by-room plan for replacing them.
Your home should be the safest place your family spends time. Right now, for most American families, it is not. That is what we are here to fix.