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Watermain under road with insificient cover

Watermain under road with insificient cover

Watermain under road with insificient cover

(OP)
I have a watermain that has to pass over a very large storm pipe. The thermal cover will be 3'. 5' of cover is required in our area. Should pre-insulated pipe be used or should styrofoam sheets be used above the pipe? Both?

Thanks,
PG

RE: Watermain under road with insificient cover

You might also consider concrete encasement or "controlled density backfill" (a soil cement mixture) either of which would add structural strength.

good luck

RE: Watermain under road with insificient cover

If there will always be plenty of flow in the main you might not really need either.  But to achieve the lacking 2' of thermal (earth) cover, 2" thick insulation (board/sheet) would be enough.  But you need to extend it probably 4' or so each side of pipe.  And, there could be a concern the storm drain line would have freezing temperatures, with frozen soil forming around it (well probably not unless it was a short culvert, but some agencies tend to regard them as a "cold" source).  A possible side effect from shallow sheet insulation under a road is that it can cause icing on the road surface, as it can be a "cold" spot with less heat rising from below.  Given the above, I would recommend pre-insulated piping with 2"-3" annular insualtion.  No additional sheet insulation.

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