BACKFILLING OF THE TRENCH
Pexgol pipes in any class do not require sand embedding neither compacting. The excellent scratch resistance of the Pexgol pipes enables laying the pipes in trenches with no sand bedding; if sand bedding is required by the pipe designer, fill the trench with sand 10 cm above the pipe.
Backfilling the trench using the earth originally removed from the trench is allowed (in accordance with ISO 14531, Part 4); if corrosive soil is used to cover Pexgol pipes that are connected with metal fittings, cover the fittings with sand, not with the corrosive soil.
No compacting is required for any class of Pexgol pipes regardless of the depth of the trench.
Installation below a road or a pavement can be done without any protective sleeves. In this case, controlled compacting of the soil / ground, according to the designer’s instructions, should be applied when covering the pipe to prevent the ground sinking.
It is recommended to insulate hot water underground Pexgol pipes to reduce energy losses.