Reference tables
The lookups contractors and owners ask us for most, with the code or standard each one comes from.
Civil Engineering Unit ConversionsPlans, reports and product data mix units: flows in cfs, gpm and MGD, loads in kips and pounds per square foot, bearing …Lumber Nominal vs Actual SizesA 2x4 is not 2 inches by 4 inches. Nominal sizes describe the board before it is dried and planed, and the …Minimum Concrete Cover for Rebar (ACI 318)Concrete cover is the distance from the surface of the concrete to the nearest reinforcing bar. It protects the steel from corrosion …OSHA Trench Soil Types and Maximum Allowable SlopesOSHA requires protection for workers in excavations 5 feet deep or more unless the excavation is entirely in stable rock. One option …PVC SDR 35 Sewer Pipe Sizes (ASTM D3034)SDR 35 PVC is the green gravity sewer pipe used for most sanitary sewer laterals and mains, and it is common for …Presumptive Soil Bearing Values (IBC Table 1806.2)When a building department does not require a soils report, the International Building Code lets designers use these presumptive values for footings. …Runoff Coefficients (C) for the Rational MethodThe rational method, Q = CiA, estimates peak stormwater flow from a small site, and C is the fraction of rainfall that …Slope Ratio to Percent and DegreesSlopes on civil plans are written three ways: as a ratio of horizontal to vertical (3:1), as a percent grade (33.3%), or …US Rebar Sizes, Areas and WeightsStandard US reinforcing bars are named by number, and the number is the nominal diameter in eighths of an inch (a #4 …Unit Weights of Common Construction MaterialsUnit weight (density) is what turns a volume into a load or a truck count. These are the design densities engineers use …
Have a project? Get a free quote.
Tell us what you need. An engineer licensed in your state replies with scope, fee and schedule.