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-   -   Pex: home-run vs Brach? Why not both? (http://www.diychatroom.com/f7/pex-home-run-vs-brach-why-not-both-132247/)

teeman11 02-01-2012 07:06 PM

Pex: home-run vs Brach? Why not both?
 
I have been reading about the different way to install pex and I'm interested in doing the home run version for the faster hot water but if that is the main advantage why do home run for the cold as well? Wouldn't it make more sense to just home run the hot and branch the cold?

Thanks,
Tremain

Plumber101 02-01-2012 07:12 PM

Typicall for a residential application you would run a 3/4 main and branch off the main with 1/2.

You also need to size for the FU's. Fixture unit's

TheEplumber 02-01-2012 09:03 PM

Manifold system uses less fittings which saves time. But not too many homes in my area plumbed with manifolds. In fact not too many homes are
being built:whistling2: Most guys here use mains with branches though

ben's plumbing 02-01-2012 09:06 PM

out here in pa can say mix of both ..manifolds and branches....my company is starting a 70 unit condo project in march the builder and I just finished our layout for the plumbing and hvac...going manifolds...:yes:

teeman11 02-02-2012 09:12 AM

Quote:

Originally Posted by Plumber101 (Post 841578)
Typicall for a residential application you would run a 3/4 main and branch off the main with 1/2.

You also need to size for the FU's. Fixture unit's

For home run I was thinking 1/2 to everything. I was originally thinking 1/2 to showers and laundry and 3/8 to sinks but I could find 3/8 shutoffs.

For branch I would go with 3/4 main and tee 1/2 off for laundry, contiune 3/4 main and tee 3/4 to 1st floor bath which would then tee 1/2 to toilet with 3/4 to tee 1/2 to sink and 1/2 to shower. Continuing with 3/4 main, tee 1/2 off to kitchen sink and finally continuing the 3/4 main to second floor bath and tee 1/2 to toilet with 3/4 to tee 1/2 to sink and 1/2 shower/tub.

For the combo I was thinking homerun 1/2 hot to laundry, 1st floor sink, 1st floor shower, kitchen sink, 2nd floor sink, and 2nd floor tub/shower. Them branch just like above for cold. Actually, I forgot the hose bib, so that would have to branch off there somewhere as well. Is a 3/4 main big enough for all of that?

Other than quick hot water time what are the other advantages to homerun? Less fittings? but doesn't that even out with more tubing? not to mention the cost of the mainfold.

TheEplumber 02-02-2012 09:51 AM

Quote:

Originally Posted by teeman11 (Post 842037)
Other than quick hot water time what are the other advantages to homerun? Less fittings? but doesn't that even out with more tubing? not to mention the cost of the mainfold.

Make a material list of the methods your considering. Price them out at a box store or online.
Now, i now you're doing the labor, but put a value on your time and calculate how many hours you think it takes drill holes, measure every pipe length ,crimp fittings, anchor pipes, nail plate, pressure test, etc. I'd seriously like to hear your answer.

teeman11 02-02-2012 01:53 PM

1 Attachment(s)
Quote:

Originally Posted by TheEplumber (Post 842059)
Make a material list of the methods your considering. Price them out at a box store or online.
Now, i now you're doing the labor, but put a value on your time and calculate how many hours you think it takes drill holes, measure every pipe length ,crimp fittings, anchor pipes, nail plate, pressure test, etc. I'd seriously like to hear your answer.

Ok sure here's what i came up with:

Home run both hot and cold 3/4" to manifolds 1/2" to everything from there. Originally, I was going with a manabloc but to keep the cost consistent I priced it with a copper 6 port for hot and 10 port for cold. I would need 1 100ft roll of 3/4" (white because i don't feel like buying 100 of blue and 100 of red seeing as I only need about 60ft total), 1 100ft roll of 1/2" red and 2 100ft rolls of 1/2" blue. Total 3/4" run is 60ft and 1/2" run is 227ft. Total fittings (including shutoffs) is 21 and total clamps is 46. Total holes drilled thought joists is 37 (I didn't included stubbing up or out because that will be the same for every configuration) and total clips is 43.
Total material cost was $401


Branch both hot and cold 3/4" main 1/2" to everything from there. I would need 1 100ft roll of 3/4" (white because i don't feel like buy 100 of blue and 10o of red seeing as I only need about 94ft total), 1 100ft roll of 1/2" red and 1 100ft rolls of 1/2" blue. Total 3/4" run is 94ft and 1/2" run is 102ft. Total fittings (including shutoffs) is 34 and total clamps is 68. Total holes drilled thought joists is 34 and total clips is 26. Total material cost was $365


Home run hot and branch cold 3/4" main and to manifold 1/2" to everything from there. Copper 6 port for hot. I would need 1 100ft roll of 3/4" (white because i don't feel like buy 100 of blue and 10 of red seeing as I only need about 77ft total), 1 100ft roll of 1/2" red and 1 100ft rolls of 1/2" blue. Total 3/4" run is 77ft and 1/2" run is 154ft. Total fittings (including shutoffs) is 29 and total clamps is 60. Total holes drilled thought joists is 34 and total clips is 38. Total material cost was $365 (cost of the extra fittings and clamps was equal to the 10 port manifold)


Totals
Home Run 60ft 3/4", 227ft 1/2", 21 fittings, 46 clamps, 37 holes, 43 clips, $401
Branch 94ft 3/4", 102ft 1/2", 34 fittings, 68 clamps, 34 holes, 26 clips, $365
Both 77ft 3/4", 154ft 1/2", 29 fittings, 60 clamps, 34 holes, 38 clips, $365

Surprising everything was pretty close with the main labor be clips to clamps as well as total footage. The way my house is set up puts the manifolds right by the first floor bath (with the kitchen just past it) and right underneath the chase to the second floor bath. I have no joist to drill to get to the kitchen sink (all soffit), 1 joist to get to 1st floor toilet and sink, 3 joist to 1st floor shower, up the chase and no joists to 2nd floor toilet, 3 joists to 2nd floor sink, 1 joist to 2nd floor tub/shower (the 2nd floor joists run perpendicular to the first floor joists.) The hose bib is right under the manifold and the laundry directly adjacent to it. For those most part, where I would branch off the main would leave me with the same amount of holes drilled.

Attachment 45116

I hope that all makes sense.

Thanks,
T

teeman11 03-15-2012 10:43 AM

Any thoughts?


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