Reference charts
Reference charts for the trades
Code tables and rules of thumb you look up on the job, laid out as plain tables with the edition and section they come from. Our calculators read the same numbers, so a chart and its calculator never disagree.
Roofing
Roofing CalculatorsFraming
Framing CalculatorsDrywall
Drywall CalculatorsPainting
Painting CalculatorsElectrical
Electrical CalculatorsPlumbing
Plumbing CalculatorsHVAC
HVAC CalculatorsLandscaping
Landscaping CalculatorsHow these charts are kept accurate
Each chart is generated from a single data file. Where a value comes from a model code (the National Electrical Code, the International Residential, Plumbing or Energy Conservation Code), the table names the edition and section, and the page says so. Codes are adopted locally, often with amendments and sometimes years late, so confirm the edition your inspector enforces.
Values that are not code (material weights, paint spread rates, shingle coverage) are typical manufacturer or supplier figures and are labelled that way. The label on the product you buy always takes precedence.