The minimum size of a building drain typically depends on the local Plumbing codes and the specific application of the drain. Generally, for residential buildings, the minimum diameter is often 3 inches for a building drain serving a single-family home. However, for larger systems or commercial buildings, the minimum size may vary, often starting at 4 inches. Always consult local codes and regulations to ensure compliance.
2" minimum.
Minimum 1 1/2"
1/2" water lines. Drain line determined by flow rate of showerheads and bodysprays being used. 5.7 gpm or less flow rate would need 1 1/2" drain, which is minimum size allowed.
The minimum size of a crawlspace opening typically needs to be at least 18 inches by 24 inches to allow for adequate access and ventilation. This size ensures that a person can safely enter the crawlspace for maintenance and inspections. Additionally, local building codes may have specific requirements, so it’s essential to check those regulations as well.
2"
drain piping 4 inch or larger requires a minimum clean-out size of 3 1/2".
2" minimum.
There is no physical minimum door size - custom doors can be made to any size. There might be building codes for your area specifying what the minimum door size is for a commercial or residential structure, though...
Minimum 1 1/2"
1-1/2 inch drain for above grade and 2 inch drain for below grade. Most UPC-based codes (IAPMO) require 2 inch above and below grade.
10 by 10
The minimum landing size required for stairs according to building codes is typically 36 inches in the direction of travel and at least as wide as the stairs themselves.
The minimum size wire that engineers spec for industrial and commercial installations is #12 and it usually is stranded not solid wire.
1/2" water lines. Drain line determined by flow rate of showerheads and bodysprays being used. 5.7 gpm or less flow rate would need 1 1/2" drain, which is minimum size allowed.
Length x Width and then Pitch with a minimum of 2" diameter and it is called a STORM drain as no one really wants to just let potable water run down a drain constantly as it can be quite expensive
The outlet pipe needs to be a minimum of two inches and then expanding to the four inch main line
Depends on how far they span from bearing points.