OK–what’s used in your area for footing drains and tight lines carrying roof water?
Around here there seem to be two commonly used types, a corrugated black flexible pipe (perf or not) and a white, rigid, no-glue, bell/hub type, also perf or not.
I am more used to seeing 4″ PVC, glued, from my days in CA. Where I am now it’s only going to be buried 18-24″, so some crush resistance seems advisable. PVC is much more costly than it used to be, but I still think I favor it.
Keeping HVAC systems within the conditioned enclosure can be tough without a basement; one option is to use plenum trusses for the roof, which offer a space for equipment and ductwork.
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I don't like the idea of the corregated for roof water. You will get all kinds of seeds, leaves, and vegatation washed down and end up in the groves.
Then it becomes a nice place for things to grow.
There are 3 kinds of underground piping systems.
PVC sch 40.
And SDDR 35. And Sewer and Drain pipe (ASTM D-2729 IIRC).
At least in the 4" size the OD of the sch 40 is slighly different than the SDR #% and S&D and you need an adapter to go between them. S&D and SDR 35 can use the same fittings.
Of the 3 the S&D is the thinest wall and the sch 40 the thickes.
But the S&D is the only one that gives a crush resistance rating. But, without looking buying the spec books I could not fidn out what it ment or how it was tested.
As far as pref go it depends on if the soil can easly handle the water or not and you don't want to use it unless you get some distance from the builting.
But S&D and SDR 35 come in either solvent weld connections for with a large bell end with an O-ring for push connects.
There is also another standard. I am not sure if I have this right or not, but it can up a few months ago and I think that it was sch 20 PVC. But it's use to to be limited regionally (NE IIRC).
A couple of years ago I ran a couple of hunred feet of S&D for gutters and catch basins. But the last stick on each side I up graded (don't remember if was sch 40 or SDR 35), be cause it get some very occasional traffic.
And on ons side I extended some footing drains with corregated.
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A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.