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# How are piping man hours calculated?

Calculating man hours is the basis for being able to measure the cost per project of each type of expert and his contribution to the result. The total man hours per task is obtained by multiplying the number of people assigned to a task by the total time it takes to complete it.

## How do you calculate piping jobs?

Here’s an easy way to price a plumbing job:

Determine your base hourly rate by writing down how much you want to make per week and dividing it by the number of billable hours you can work. Calculate your overhead and profit margin, then add that to your base hourly rate. This is your net billable hourly rate.

### What is takeoff in pipe fitting?

First, a definition of “take off”: The length of pipe to be removed (taken off) such that a pipe and a fitting make a specific length. The term is a concept shorthand used by pipefitters and plumbers.

#### How do you measure pipe fittings?

For male pipe threads, be sure to measure the outside diameter at the widest point of the threads. For female pipe threads, measure the inside diameter at the widest point of the threads. You can then use these measurements to find the right size in a nominal pipe size conversion chart .

#### How much length do pipe fittings add?

The distance between the fittings and the extra reach must be included in the length. If you are using 1/2 inch pipe, add 7/16 inch per end and 1/2 inch per end.

#### Does pipe length include thread?

The stated size is the total length of the pipe nipple including the threaded sections. This does appear to be consistent among manufacturers (at least in the US / North American market). Also an important detail is that the length of the threaded sections is standard for each pipe diameter

## How much does it cost to plumb a house with PEX?

A whole-house plumbing replacement using PEX in an average two-bathroom home costs between \$4000-\$7000. The exact cost for a plumbing replacement or “repipe” would hinge on the total number of fixtures in your home, the size of your home, the accessibility of your pipes, and whether it is a single or two story home.

### How long does PEX pipe last?

Generally, PEX pipes last for 25 to 40 years before they need to be replaced. By comparison, copper pipes last for around 50 to 70 years. PVC pipes also last 50 to 80 years. CPVC pipes last 50 to 75 years.

### Do mice chew PEX tubing?

Mice and rats will chew through anything they can, including plastic, so PEX tubing is at just as much risk as the plastic-coated wiring in a car or an HVAC unit. While all rodent damage can be expensive, if rodents chew through a home’s PEX water pipes, the result can be disastrous.