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These numbers come from the "Mathematics for Plumbers and Pipefitters" book.

1.414 is the square root of 2. To find the travel of a 22 1/2 degree offset, multiply by 2.61

.414 is NOT for the diagonal (like the constant 1.414 is for a 45*) but rather for the OFFSET of 22.5* (.414 is the tangent of 22.5) Source: Mathematics for Plumbers and Pipefitters, Appendix 283 Constants for 22 1/2 degree fittings and Data 25 Constants for Parallel Offsets

I did my five year apprenticeship at Plumbers Union local One in NYC. We never did tangents, we always did travel, advance or offset. Many years ago when bell and spigot was popular plumbers had to know all kind of formulas but now we use nohub pipe.Down to 1/4 bends, 1/8 bends and 1/16 bends or 1/5 and 1/6 bends for rolling offsets once in a blue moon. The only time we use a 22 1/2 degree offset is fitting to fitting. By the way the video was very interesting.@@ContractorLicenseCenterVideos

@@anthonymonah7116 He says .414 to find the OFFSET, you're calculating the travel which is the offset multiplied by 2.61. For a 45 degree the offset and the advance are the same, but for 22.5 degrees the offset and travel are different. It's trigonometry you should learn.

Same here

Me too bro

Right? Aha I’m just approaching the last of my twenties and all that partying and making friends really led me to fuck all career wise. No foundation and I just wanna have some comfort knowing I have something to fall back on.

@@cattlecooker953 I’m 21 and idk have a lot of issues. Let’s start with my gf comparing what we have to other people such as an exxxxx. Yeahhhhh need to get my ducks in a row. Not because my girl is basically comparing what I have to her ex. But because at anytime ong I might have to dip and have ambitions too. Goals. Idk I’ve been a bum doing fuckin housekeeping the past 4 years because I was a late bloomer for my license so I got a job with my mother and carpooled out of convenience. Now I feel like I’m completely fucked

@@theindustryfarm7405 if she’s comparing you to your ex just leave her alone, trust me that’ll continue to be a problem even if you mention you have a problem and ask her to stop odds are she’ll grow resentment and label you as “controlling” and continue to look for other meat while stringing you along as a “back up”

fuck

Glad it helped!

Each section of the roof only needs a 3 inch leader, after multiple sections of the roof are connected (under the roofing) you would have to increase the pipe size to handle the combined surface area.

This video appears to answer a specific licensing question, but to answer yours, you need to determine each area of the roof to the drain (by checking the cricket design). If you have a 40,000 SF roof, the water diversion may not be equal (thanks to annoying architects) so you have to evaluate each zone independently.

Same table

It’s a mathematical constant. It’s derived from 144 = square inches per foot(square inches per foot) and 1 gallon = 231 cubic inches therefore; 144/ 231 = .623; .623 / 60 (minutes per hour) = .0104 Also found on various manufactures charts, such as this one from JOSAM Quality Engineered Plumbing Drainage Products. www.josam.com/images/josammkt/zzother/C07_pgrd7.pdf The formula being GPM = .0104 x I x A, where GPM = Gallon per minute I= Rainfall inches A= roof area- Square Feet

Our example is for the vertical drain pipe. Since our rainfall totals 2496 gallons per minute and a 12” vertical drain pipe has a capacity of 3272 GPM per IPC Table 1106.2, we only need 1-12” vertical drain pipe. If your question is asking how many horizontal drain pipes are needed, It would depend on the pipe size selected and the slope. A 4” horizontal drain pipe with a slope of ¼ inch per foot has a capacity of 163 GPM, so 3272 GPM / 163 GPM = 20.07, so we would need 20-4” horizontal drain pipes. A 10” horizontal drain pipe with a slope of 1/8 inch per foot has a capacity of 1311 GPM, so 3272 GPM / 1344 GPM = 2.49, so we would need 3-10” horizontal drain pipes. Vertical leaders are sized based on the flow rate from horizontal gutters or the maximum flow rate through roof drains, not exceeding that specified in IPC Table 1106.3.

Segis, this depends on what license your applying for. The State of Arizona has a license that you can get with 0 years of experience its the R-62 Minor Home Improvements and your limited with the project size to $5,000 (material & labor). Other licenses do require 1-4 years of experience. Thanks for pointing that out!!

It’s actually 4 yrs exp

The intended method of sizing per 2018 IPC was to use the manufacturers’ flow rate through the drain. This is correct. However, per IPC 1106.2 “Size of storm drain piping. Vertical and horizontal storm drain piping shall be sized based on the flow rate through the roof drain. The flow rate in storm drain piping shall not exceed that specified in Table 1106.2..” Therefore, we must calculate the flow rate to determine the correct size.

Where did .0104 come from? 1 inch of rainfall per hour = 144 (square inches per foot) / 231 (cubic inches per gallon) = .623 (gallons per hour), .623 (gallons per hour) / 60 (minutes per hour) = .0104 GPM Also found on various manufactures charts, such as this one from JOSAM Quality Engineered Plumbing Drainage Products. www.josam.com/images/josammkt/zzother/C07_pgrd7.pdf