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Old 03-23-2018, 08:27 AM   #16
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Re: whole house re-pipe DIY...please help!


When I first started using PEX I bought copper crimp ring tools and have used them for the last 10 years. I recently bought a SS cinch clamp tool and used it on a water heater replacement job. The SS cinch clamp tool is much easier to use in cramped locations and this one tool covers sizes from 3/8 up to 1 inch.
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Old 03-23-2018, 09:18 AM   #17
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Re: whole house re-pipe DIY...please help!


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I don't mind investing in tools for this purpose and for future maintenance purposes. What tools do I need and how much do they cost?
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The other option is to use the crimping type of PEX.

Crimping vs expansion: PEX tubing is manufactured so that it wants to return to it's manufactured size/shape.

When crimping, you are forcing the pex to a smaller diameter - the crimp will always be working against the pex. The risk of failure with crimps is greater. The crimping tool is much cheaper and the crimps and fittings are probably much more readily available.

When using the expansion method, the pex will attempt to return to a smaller diameter. Meaning it will become tighter on the fittings over time.
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Old 03-23-2018, 10:44 AM   #18
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Re: whole house re-pipe DIY...please help!


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With a manifold, each fixture gets a home run, so all of the shutoff valves are in the basement at that manifold. That works great when all of the walls are open.

In my rental properties, I now remove all of the old plumbing (supply and drain) and replace with pex and pvc. I run a red and a blue 3/4" pipes the length of the basement. I tee in wherever risers are. If going to the second floor where there are two bathrooms, I run 3/4" risers and then tee off of them to supply the tubs, sinks, and toilets. To do that, I typically remove part of the first floor ceiling.

The only tools you need are the crimping tools, and the pex cutting tool. There are two types of crimping tools. I have the one that crimps both 1/2" and 3/4" rings, but that type is a little difficult to use in tight spaces.
Given that the plumbing is in the craw space and not easily accessible, should I still use a manifold?
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Old 03-23-2018, 11:23 AM   #19
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It's up to you, but typically, the manifold would be close to where thr supply enters the house from the street, but in an easily accessible location, such as near the laundry tub. You may have to use a little more pex, but it might be worth it.
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Old 03-23-2018, 04:29 PM   #20
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Re: whole house re-pipe DIY...please help!


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Given that the plumbing is in the craw space and not easily accessible, should I still use a manifold?
Definitely go with a valved manifold if you can. Split your current supply to temporarily feed the manifold and then you can connect one fixture at a time to the manifold and still maintain water to all fixtures as you move along with the repipe.

I went with all homeruns. Overkill but I like the ability to control all fixtures independently.
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Old 03-23-2018, 07:02 PM   #21
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Re: whole house re-pipe DIY...please help!


If you decide to use expansion type fittings (Uponor) make sure the fittings and Type A PEX are available locally. PIA ordering everything on line.

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