How can I make sure my pex line is sloped so I can drain it?


I'm running a cold-water pex line in a basement crawlspace that gets extremely cold (i.e. freezing) in the winter.

I'm going to use a drainable ball-valve inside the house so I can drain it in the winter but how can I run the pex line to make sure it's sloped? The run is about 25 feet long.

I think I have two options:

1) Run it through floor joists (requires a hole in every joist since my line is running perpendicular to them)

2) Run it under the joists and use clamps and wood shims under each joist to achieve a slope.

I'm leaning towards #1 but to make sure I have a good slope I think I'll need to measure my holes to make sure the line is actually sloping. For example, I thought I would measure a certain distance from the joist to the floor above to make sure my holes are actually sloping down.

Any other suggestions?

(NOTE: This question is sort-of a follow-up to this: Do I need to angle/pitch pex tubing for draining in the...

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If you are concerned about freezing, then the simplest answer is to install a ball valve inside the house, where it is insulated, so that you can shut off and drain the water before it exist the house.

As for connecting to the sillcock, 1" pex is a slightly unusual size; Most sillcocks are 3/4 inch but 1/2 inch sillcocks are also fairly common, so (probably) what you want is a 1 inch barb to 3/4 inch (reducing) female threaded connector. I found an adapter from sears that could do the trick. U S BRASS CORP/ZURN-QEST QQSFC45GX 1 x 0.75 in. Barb Ringed Shank Pex Adapter. Below is picture of it, but for $17 it's not what I would choose. Also, you would need a 1" ball valve which will cost about $10-$12.

I think that the better solution would be to use a 1" to 3/4" reducer for $2, a 3/4" ball valve for $7 (it's a few $$ cheaper than a 1" ball valve), then a 3/4 inch barb PEX female threaded fitting for about $3. Obvioulsy, you would need some 3/4" pex and some...

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How To Slope Drain Lines TIPS

Jennifer Brown, who lives in Panama City, FL, purchased a new home that's got some serious plumbing issues. Read this:

"We purchased a new home about a year ago and have had non-stop plumbing issues. After months of the plumber coming out and telling us there was no problem, it was discovered that one of our pipes was completely level, and since we have a gravity-fed sewer system, the waste was not flowing out to the main line.

After digging up our slab and fixing the slope on one of the pipes, we stopped having sewage back ups but still smelled sewer gas in our laundry room when we used the washing machine. After having the plumber come out once again, he determined that sewage and water were sitting in our pipes.

We are afraid that this is an indication of another pipe that does not have the proper slope. Our builder keeps telling us that it is normal for sewage and water to sit in these pipes since this a gravity-fed...

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. So even if there are no existing plans for the radiant floor heating or a snow melting system, installing PEX tubing in it may turn out to be a good decision.

Types of concrete slabs with radiant floor heating

Thick slabs

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Prestart Checklist

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