Just finishing up a large planter box and wanted to line it with something to protect the wood (though it is pressure-treated) and keep the water draining down, not out the side cracks. Any suggestions? My brother uses thick garbage bags staple-gunned in– my friend suggested some sort of rubber membrane or rubber sheeting, but that sounded like it might be overkill. Any suggestions?


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  1. you guys are making a mountain out of a mole hill! Simple use landscape cloth it will retain the soil and the moisture. foam will disintegrate asphalt is going to leach petrolium into your soil . Landscape cloth.

  2. scrap pieces of foam board will give good insulation for your plants. to hold in place, hot glue the board to the interior and top-staple black plastic to the wood over it .

    if you’re patient, sometimes you do indeed get lucky on trash day.