Primary sources first
For code or permit questions, use your municipal, provincial/state or national building authority. For product installation, use the manufacturer’s current technical documents. For regulated trade work, use the licensing or inspection authority that applies where the property is located.
Water and energy efficiency
Recognized public programs can help when comparing some products. Examples include U.S. EPA WaterSense, ENERGY STAR, and Natural Resources Canada energy-efficiency information. Availability and labels differ by country.
Advertising and privacy
For information about Google advertising technologies, see Google’s Advertising technologies, cookie information, and partner sites data-use explanation.