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Garden Walls

What you need:

  • Flat surface board or surface to work on
  • Crack foam filler (expandable)
  • Hand saw/knife
  • Silicone rubber mould product (available at art shops)
  • Small paintbrush
  • Small hammer
  • Tile adhesive
  • Steel trowel
  • Fine river sand
  • Building stone (12mm)
  • Cement powder
  • Cement oxide
  • Any Container
  • Damp river sand

What to do:

  1. Shake the Foam filler can vigorously to mix contents (as indicated by the manufacturer instructions).
  2. Remove cap carefully, holding can away from face. Carefully screw the nozzle fully onto valve. (Refer to the manufacturer’s safety instructions).
  3. Holding the can upside down, spray a small amount of foam onto the flat surface – try to do this in a circular movement to create a rounded shape for the rock but it does not have to be a perfect circle
  4. Leave the foam to dry for 24hrs
  5. After 24hrs, you will notice that the foam have grown bigger and formed a rugged looking circular shape. Take a hand saw or a knife, cut off the back of the foam mould (the cladding needs to be flat  at the back because it will be attached to the wall)
  6. Mix the Silicone rubber mould product according to the manufacturer’s instructions.
  7. Place the foam back onto the flat surface. Use a paintbrush to spread the silicone rubber mix onto the top as well as on the sides- making sure you are creating a lip.
  8. Leave the newly painted foam to dry for at least 24hrs.
  9. When dry, peel off the dry latex rubber from the foam. This rubber will form the Lava rock mould.
  10. Mix 2 scoops of fine river sand, 1scoop of 12mm building stone, 2 scoops of cement and 250g oxide with enough water to form a runny concrete mixture. This mixture will be enough to do 3 moulds, so for a larger volume just simply stick to the ratios 2; 1; 2 and for the oxide – follow the manufacturer instructions ratio.
  11. Fill up a container with damp river sand; make a hole in the middle then place the rubber mould inside. The river sand acts as a support for the mould.
  12. NB: Instead of doing the step mentioned above- you can also dig a hole in the ground and place the mould in it
  13. Pour in the concrete mixture into the rubber mould until it is completely full. Use a steel trowel to agitate it and leave it to dry for at least 24hrs
  14. When the mould has completely dried, peel off the silicone rubber mould to reveal a concrete lava rock to use for cladding.
  15.  To attach you cladding to the wall, mix a bit of tile adhesive and apply onto the flat part of the rock cladding.

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