Some of my answer would depend on the material the frame is.  If wood that you 
can sink screws into, or plastic or metal that screws or bolts can be put 
through would secure the board, plywood.  If you can secure the board around 
the edge a thinner material can be used.  Even one fourth would work if you 
have at least one inch of material past the hole where the screws would go.  If 
you don't intend to fasten it down half inch will work unless someone is very 
overweight.
Ron
  ----- Original Message ----- 
  From: john schwery 
  To: [email protected] 
  Sent: Sunday, August 30, 2009 6:05 PM
  Subject: [BlindHandyMan] outdoor love seat?


    We have an outdoor love seat which is not comfortable because the 
  straps either stretch and move or break. they seem to be made of a 
  solid plastic stuff about a 32nd of an inch thick. I'm thinking of 
  putting a piece of plywood under the cushion. What thickness of wood 
  should I use?

  John



  

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