SEALANTS AND ADHESIVES
Caulks, sealants, and adhesives often contain solvents, VOCs, formaldehyde, phthalates, BPA, and other harmful substances. These ingredients can emit fumes that irritate the respiratory system, disrupt hormones, or even increase cancer risk. Some formulations also include biocides for mold and mildew resistance, which can be problematic for indoor air quality and sensitive groups.
Priority of choice
Best choice
Good alternatives
Less recommended / Better to avoid
- Water-based latex caulks
- Siliconized latex sealants,
- Solvent-free silicone caulks for wet areas,
- Acrylic sealants, solvent-free / with very low VOCs.
- Polyurethane sealants (single- and two-component),
- Butyl rubber and synthetic rubber caulks.
Tips for healthier choice
- Choose caulks and adhesives with low or no VOCs (ideally less than 25-50 g/L for interior applications).
- Prefer caulk-type sealants over spray foam; use foam tape if foam is necessary.
- Check the ingredients list and avoid health-harming products: petroleum solvents, ethylene glycol, isocyanates, formaldehyde, phthalates and bisphenol A, ethylene glycol, toluene, xylene, or acetone.
- Avoid mold-resistant sealants unless absolutely needed for high-humidity or wet environments.
- Favour mechanical fastening and design features (like weatherlaps) where possible to reduce sealant reliance.
- Always apply in well-ventilated spaces and follow safety instructions.
- Wear protective personal equipment (PPE) when handling sealants and adhesives.
Certifications to look for
