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SURFACE PREPARATION AND DRAINAGE
Correct surface preparation is essential to ensure that the required walk- or drive-over rating
is achieved (see page 5), as well as sufficient drainage to prevent permanent flooding of
the chamber(s).
Each sleeve should be mounted into a level surface that is free draining, such as a permeable
stone/gravel mix. If the base is concrete then suitable drainage holes should be created.
The following minimum drainage rates should be met or exceeded:
Sleeve length
Sleeve volume
Minimum drainage rate
1ft
0.6 gallons
0.022 gallons per minute
(2.7 liters)
(0.1 liters per minute)
4ft
2.4 gallons
0.09 gallons per minute
(10.9 liters)
(0.4 liters per minute)
Where drainage rates are insufficient, further measures should be employed, such as a
French drain below the immediate mounting surface of each sleeve.
MOUNTING HEIGHT
IMPORTANT: For walk- and drive-over installations, the long sides of the sleeve
must be fully supported and the sleeve height must be arranged to ensure that its
top edge is exactly level with the finished surface:
Soft ground
Walk-over applications
Concrete
Full drive-over rating
Soil
Stone/
gravel
mix
Sleeve too high
Sleeve too low
Sleeve level with surface
Содержание Terra Linear
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