{"hq_id":"hq-p-hom-000182","name":"Drywall and Gypsum Board (Chinese Drywall Sulfur Off-Gassing)","category":{"primary":"household","secondary":"construction","tags":["drywall","gypsum","Chinese drywall","sulfur","hydrogen sulfide","copper corrosion","mold"]},"product_tier":"HOM","overall_risk_level":"low","description":"Standard gypsum drywall is chemically inert and safe. However, defective Chinese-manufactured drywall imported during the 2004-2008 US housing boom contained excess sulfur compounds that off-gassed hydrogen sulfide (H2S) and other sulfurous gases. 100,000+ homes affected in FL, LA, VA, and other states. Symptoms: headaches, respiratory irritation, copper pipe/wire corrosion (black coating), and characteristic 'rotten egg' smell. Remediation requires complete drywall replacement.","synthesis":{"derived_risk_level":"extreme","synthesis_confidence":0.757,"synthesis_method":"compound_composition","context_used":"human_child","context_source":"product_users","exposure_modifier":1.4,"vulnerability_escalated":false,"escalation_reason":null,"compounds_resolved":1,"compounds_total":1,"synthesis_date":"2026-05-09","synthesis_version":"1.2.0","methodology_note":"exposure_modifier and adjusted_magnitude are computed from ALETHEIA-calibrated heuristics (route × duration × frequency multipliers, clamped to [0.5, 1.4]). Multipliers are directionally informed by EPA Exposure Factors Handbook (2011) and CalEPA OEHHA but are not regulatory consensus. See /api/methodology for full disclosure."},"hazard_summary":{"sensitive_populations":"residents of homes with Chinese drywall (2006-2009 construction)","overall_risk":"low","primary_concerns":["Defective Chinese drywall (2006-2009): H2S off-gassing, copper corrosion","100,000+ US homes affected — FL, LA, VA highest concentration","Standard US drywall: no chemical off-gassing concern","Mold on drywall paper facing: separate moisture-related issue"],"exposure_routes":"Inhalation of H2S from defective drywall (historic issue)"},"exposure":{"routes":["inhalation"],"contact_types":["inhalation"],"users":["adult","child"],"duration":"continuous","frequency":"daily","scenarios":["Continuous H2S off-gassing in homes with defective Chinese drywall (2006-2009)","Copper corrosion of plumbing and electrical wiring (fire hazard)","Standard US-manufactured drywall: no off-gassing concern","Mold growth on drywall paper facing in humid environments"],"notes":"CPSC 2010: identified Chinese drywall as cause of home corrosion and health complaints. Remediation: complete removal of all Chinese drywall + replacement of corroded copper. Standard US drywall (National Gypsum, USG, Georgia-Pacific) does not have this issue. Mold on standard drywall paper facing is a separate common concern — requires moisture control, not chemical remediation."},"consumer_guidance":{"usage_warning":"Standard US-manufactured drywall is safe and chemically inert. Chinese drywall issue is limited to 2006-2009 construction — check CPSC database if home was built during this period. Signs of defective drywall: corroded copper pipes/wires (black), rotten egg smell, persistent respiratory symptoms.","safer_alternatives":["US-manufactured drywall from established brands (USG, National Gypsum)","Mold-resistant drywall (fiberglass-faced instead of paper — for humid areas)","Paperless drywall for bathrooms and basements"],"red_flags":[{"indicator":"Visible mold, persistent chemical odor, or symptoms when home","meaning":"Indoor air quality issue requiring investigation.","action":"Test air quality. Address moisture sources. Improve ventilation."}],"green_flags":[{"indicator":"GREENGUARD Gold, CRI Green Label Plus, or equivalent IAQ certification","meaning":"Product tested for low chemical emissions.","verification":"Check for IAQ certification marks on packaging or manufacturer website."}],"what_to_ask":[{"question":"What is the VOC emission profile of this product?","why_it_matters":"Indoor air quality is #1 modifiable environmental health factor — 90% of time spent indoors.","good_answer":"GREENGUARD Gold certified or emission testing data available.","bad_answer":"No emission testing or IAQ certification."}],"alternatives":[{"name":"US-manufactured drywall from established brands","notes":"USG, National Gypsum"},{"name":"Mold-resistant drywall","notes":"fiberglass-faced instead of paper — for humid areas"},{"name":"Paperless drywall for bathrooms and basements","notes":"Alternative"}]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"CPSC Chinese Drywall Investigation (2009-2015)","citation":"CPSC Docket 10-0189","requirements":"CPSC identified defective Chinese drywall. Remediation guidance published. Import monitoring enhanced.","compliance_status":null,"effective_date":null,"enforcing_agency":"CPSC","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":true,"disposal_guidance":"Construction waste. Clean drywall is recyclable at some facilities.","hazardous_waste":false,"expected_lifespan":"50+_years"},"formulation":{"form":"varies","key_ingredients":[{"hq_id":"hq-c-org-000011","name":"Formaldehyde","role":"trace_emission","concentration_pct":"trace"}],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000011","compound_name":null,"role":"trace_emission","typical_concentration":"trace"}],"identifiers":{"common_names":["drywall and gypsum board (chinese drywall sulfur off-gassing)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[{"brand":"SC Johnson","manufacturer":"SC Johnson","market_position":"mass_market","notable":"Household product conglomerate"},{"brand":"Clorox","manufacturer":"Clorox","market_position":"mass_market","notable":"Household cleaning market leader"},{"brand":"3M","manufacturer":"3M","market_position":"mass_market","notable":"Home safety and maintenance products"}],"brand_examples_disclaimer":"Representative branded products of this category. Concerning ingredients listed in materials.concerning[] apply to the category, not necessarily to every named brand. Specific formulations vary by SKU and may have changed since this record was written; consult the brand's current ingredient label before drawing brand-level conclusions.","sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-25"},{"type":"regulation","title":"CPSC Chinese Drywall Investigation (2009-2015) (CPSC Docket 10-0189)","jurisdiction":"USA","citation":"CPSC Docket 10-0189","id":"src_8b030ebf"},{"id":"iarc_100f_form","type":"regulatory","title":"IARC Monographs Volume 100F: Formaldehyde","year":2012,"inherited_from_compound":"hq-c-org-000011"},{"id":"epa_form_iris","type":"regulatory","title":"US EPA IRIS Assessment: Formaldehyde (draft)","year":2010,"inherited_from_compound":"hq-c-org-000011"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-25","timestamp":"2026-05-14T01:28:36.747Z"}}