gdavis62
05-28-2007, 01:54 PM
Got an under-slab sewer line coming through a wall we formed today for an early a.m. pour tomorrow.
That line, in 4" PVC, running under the slab, has branches and a turn, requiring PVC fittings (wyes, combos, sweep 90s). Those fittings all have hubs for the 4" line, the PVC schedule 40 pipe having a 4.500 O.D.
Instead of placing a sleeve in the wall, the plumber asked that we glue a 16" section of the sewer pipe through the form (EPS ICF), pitched very slightly to outside, and he will couple to that, inside and out.
The section he gave us to insert in the wall, is pale blue, and measures more like 4-1/4" O.D. He claims this is the pipe he always runs in under-slab sewer and drainage arrangements.
I don't get it. He cannot use hubbed PVC fittings with this. What's going on?
I am looking at Charlotte's product data, and seeing that what I likely built into the wall is a piece of PVC SDR 35, with wall thickness of 0.120" and an O.D. of 4.215".
I think he is mistaken, and this stuff cannot be used inside under the slab. It will not mate correctly with fittings, which have a hub I.D. of 4.515".
It appears to me that we must use PVC SCH40 from this wall insert up through all the fittings, and couple this SCH40 sewer line to the SDR35 insert at the wall.
It's a holiday and I cannot call the supplier. Nowhere in Charlotte's catalogs of fittings do I see a coupling/adapter that can be used to join the SCH40 4" (4.500 O.D.) to SDR35 4" (4.215 O.D.) the plumber gave us.
Is there such an animal? Or do we simply make up this joint with a rubber no-hub?
That line, in 4" PVC, running under the slab, has branches and a turn, requiring PVC fittings (wyes, combos, sweep 90s). Those fittings all have hubs for the 4" line, the PVC schedule 40 pipe having a 4.500 O.D.
Instead of placing a sleeve in the wall, the plumber asked that we glue a 16" section of the sewer pipe through the form (EPS ICF), pitched very slightly to outside, and he will couple to that, inside and out.
The section he gave us to insert in the wall, is pale blue, and measures more like 4-1/4" O.D. He claims this is the pipe he always runs in under-slab sewer and drainage arrangements.
I don't get it. He cannot use hubbed PVC fittings with this. What's going on?
I am looking at Charlotte's product data, and seeing that what I likely built into the wall is a piece of PVC SDR 35, with wall thickness of 0.120" and an O.D. of 4.215".
I think he is mistaken, and this stuff cannot be used inside under the slab. It will not mate correctly with fittings, which have a hub I.D. of 4.515".
It appears to me that we must use PVC SCH40 from this wall insert up through all the fittings, and couple this SCH40 sewer line to the SDR35 insert at the wall.
It's a holiday and I cannot call the supplier. Nowhere in Charlotte's catalogs of fittings do I see a coupling/adapter that can be used to join the SCH40 4" (4.500 O.D.) to SDR35 4" (4.215 O.D.) the plumber gave us.
Is there such an animal? Or do we simply make up this joint with a rubber no-hub?