4
Z886 PERMA-TRENCH
INSTALLATION INSTRUCTIONS
Z886 Encasement
A 4" [102] new concrete encasement is minimum. Guidelines
for reinforcing an encasement would be to use the same
thick-ness and reinforcing used in the surrounding concrete
slab. Concrete must be vibrated to remove air voids in
encasement, especially under the frame rails.
Specifying engineer is responsible for concrete encasement
and reinforcing based upon application and local codes.
Excavation
Trench excavation must include the minimum of 4" [102] on
both sides and underneath or the slab thickness surrounding
the trench. Soft and/or shifting soil substrates may cause
cracking of the concrete and consequent movement of
the trench. It is critical that the concrete be poured on an
adequate foundation. Verify depth of trench excavation to
allow for the same thickness of concrete under and beside
the trench as the surrounding slab thickness.
4 [102]
MIN.
4 [102]
MIN.
6-1/4 [159]
1-1/4 [32]
4 [102]
INVERT
