Problem complying with APN 12

R

roythegrass

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29 Nov 2010
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Location
Surrey
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United Kingdom
We are laying a patio partially within the RPA of a TPO tree (upon application the LA didn’t want to know!)
In compliance with Arboricultural Practice Note 12 (APN12) and BS5837 the layers are as follows,
starting from the ground up:
Ground
Geo textile membrane
Geocell (or similar) cellular root protection system in filled with aggregate.
Geo textile membrane
Sharpe sand.
Pavers.
The infill for the Geocell is specified as angular sub base aggregate. However angular aggregate has sharp edges which could puncture the overlaying Geo textile membrane with the weight of the sand, pavers and foot traffic thereby allowing the sand to wash through. How can this be resolved? Two layers of Geo textile?
Any advice would be much appreciated.
 
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Angular subbase will not puncture a proper geotextile. You should be using non woven needle punched fabric like terram 1000.

A light pass with a vibrating plate will knock down any large protruding stones before laying the top sheet.
 
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