On to plumbing

Now that the electrical is all wrapped up, at least until it’s time to install the outlets, it’s time to move on to the plumbing. The big improvement we are adding to the plumbing is installing a vent to serve the kitchen sink. In the previous kitchen the sink was not vented properly, so it drained slow and gurgled. Normally you would tie the vent coming off the sink into the other vents so there is only one pipe going through your roof. But that main vent is clear on the other side of the house and it would require a lot of piping and some cutting into the second floor ceiling to connect the kitchen sink. Since we just have an attic above our kitchen it is much easier to just go straight through the attic and then the roof with a separate vent.

I blogged previously about how I was going to run the drain/vent pipe inside the wall behind the sink. In order to get the drain/vent pipe in place I had to drill holes in the top and bottom plates of the wall I built. The pipe is 1.5″ diameter, which is common for draining a sink (kitchen or bathroom) or a bathtub. If you combine two drain lines together you may need a larger pipe like 2″. Don’t make the same mistake I did. If you need to bore a hole for 1 1/2″ pipe through a stud wall build your wall out of 2x4s and not 2×3. Though I can get by with the big holes I am putting through the top and bottom plates I could not go sideways with the piping!

When drilling a hole for a pipe you generally want to go 1/8″ bigger than the OD of the pipe. For 1 1/2″ pipe the OD is 1.90″. Rounding up you would use 2 1/8″. So I bought a 2 1/8″ diameter hole saw like this.
Hole saw
When you buy a hole saw make sure it is long enough to go through whatever you are drilling through. In my case it should have been 1.5″ deep or more. Since it wasn’t deep enough I had to stop 4 or 5 times and chisel out some of the wood so the bit could go down further. While 95% done with the last cut the bit jammed and broke at the shaft, taking my quick change adapter with it. 🙁
Broken bit
I chiseled through the rest got the piping in and this was the result.
Drain and vent

See that gray steel thing at the bottom of the pipe. It’s called a riser clamp. It’s designed to support a vertical run of pipe, called a riser. Some some reason Home Depot & Lowes don’t carry these anymore. I asked the guy at Lowes. You have to go to a real plumbing supply place, you know the kind of place that closes at noon on Saturday. That’s what day I was doing this all on. 🙁 So I had to buy something temporary at Lowes so I could get all the pieces cut and mocked in.

Down in the crawlspace there is a horizontal run of pipe. I located the hole where the riser goes through the floor so I could make supports out of leftover 2x3s with the small end against the floor joists. This is how it looks.
Pipe support standoffs
The white piece you can by at the home improvement store.

I had Irene help me line the pipe up so it has the proper slope. You want 1/4″ drop for every foot of pipe for this size pipe. Bigger pipes may have less slope. How did I line up the slope? I made a little “jig” by taping a 1″ long block of wood to a 4′ level.
Improvised pipe slope jig
Found that tip online somewhere. Irene held the pipe in place and I put the level on top, lined it up, and nailed the white hangars into the blocks I attached to the joists.

Drain pipe with proper slope
Long sweep elbow

When routing drain piping you will want to use long sweep elbows like the one above. These keep the water from slowing down as much and thus help prevent clogs. Once all the pipes are mocked in place it is time to start gluing them together.Pipes glued

The gluing was straight forward, except that the purple primer ran and dripped all over on me. I didn’t know it was that thin. I cut the pieces that will go in the attic, but have not glued them yet. I am waiting to coordinate with the roofer who will be doing the flashing around the vent pipe. Yup we have to hire someone for a small part of this renovation. 🙁 We have a leak in the flashing around our other (existing) plumbing vent and I wasn’t comfortable getting up on our roof. It has a steep slope (10/12). I did try though.

Next up is fixing up the hot and cold water (soldering) and putting up the drywall!!

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