DavidTu
Member
Seattle says to use either astm 1575 or astm 3034 pipe for side sewer lines. The heavy duty 1575 is for less than 18" from surface. (Confusing to me, I'd have thought heavy duty for more earth atop!) Anyway, our plumbing stack is being relocated and after passing under foundation wall, we're just over 2 ft from the sewer. Outside the foundation it's a good 5 ft underground. Is regular foam core ABS suitable for this application? They won't allow foam core for sewer so I would think not... but then again this is the building dept vs the public health so sense may not have anything to do with it. SO... foam core ABS buried 5ft within 2ft of foundation wall OR PVC 1575 OR... what? Is there solid core ABS (astm??)?
They also said for the gutter downspouts that we're routing horizontally underground around to the sewer (we already had to put in a foundation drain as the backyard slopes towards house) we'd have to use the 4" astm 1575 because it was under 18" deep (otherwise astm 3034 would be ok). When these gutter lines (3 downspouts) run into the sewer... or I should say BEFORE they do I was told by a gutter guy we'd need to put in a P-trap. So... 4" P-trap? Is that right? This can be buried too? OR what do we do? (We're afraid that the drain to downspout connection will not be great and don't want to risk introducing sewer gases at ground level, otherwise they'd of course vent to the gutters fine.)
Thanks.
They also said for the gutter downspouts that we're routing horizontally underground around to the sewer (we already had to put in a foundation drain as the backyard slopes towards house) we'd have to use the 4" astm 1575 because it was under 18" deep (otherwise astm 3034 would be ok). When these gutter lines (3 downspouts) run into the sewer... or I should say BEFORE they do I was told by a gutter guy we'd need to put in a P-trap. So... 4" P-trap? Is that right? This can be buried too? OR what do we do? (We're afraid that the drain to downspout connection will not be great and don't want to risk introducing sewer gases at ground level, otherwise they'd of course vent to the gutters fine.)
Thanks.