1. 

   matty Supporter

   be careful using rock wall it will get wet and hold water / condensation on to the panels
   best leave a gap so that condensation can breath

    

   matty, Sep 23, 2013

   #21
2. 

   S1mon

   Think of cavity walls in construction
   Unfortunately can't leave the air gap

    

   S1mon, Sep 28, 2013

   #22
3. 

   matty Supporter

   but the insulation in wal cavity's dont suck up water or have a thin metal wall

    

   matty, Sep 28, 2013

   #23

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