Fiberglass Duct Installation

Underground Burial Procedures

UnderDuct FRP should be laid in a graded trench with good drainage on a 4” bed of pea gravel. Minimum distance from under the slab to top of duct is 4" of compacted fill. The recommended maximum is 4' of compacted fill. Duct can be disgned for deeper burial. 

Encasement in concrete is not necessary. With fiberglass boots in place and sealed, cover with sand or pea gravel and pour floor slab with no delay or tie down. 

Duct is manufactured with a resin rich veil on the OD to prevent water infiltration.  Where ground water infiltration is possible the field joints should be made using the wet lay-up method as described in the installation instructions.

NOTE: Leak test the system before backfilling.