Replies

1. 
   DanH | Jul 18, 2012 08:16pm | #1

   Carefully draw your framing on a large sheet of draft paper, and use a compass to draw the arc.  Take the dimensions off the drawing.

2. 
   Frankie | Jul 18, 2012 11:04pm | #2

   Easy and accurate - Nope.  

   Think:  1/2" Preasure treated plywood, laminated to 2" thickness, while wrapped onto formwork having the reqired radii.

   Note: Lamination glue needs to be PT friendly.

   Frankie

3. 
   BossHog | Jul 19, 2012 06:40am | #3

   The PVC decking manufacturers all sell trim boards for the edges of the decking. I don't know if it will bend to that radius easily. If it doesn't you could probably kerf it and it should work.

   I don't get the question about the framing. You lay out the curve, run the framing out there, and cut it off where it needs to end. You use extraa blocking and extra framing to make the curve. (Curved PVC trim will need a lot of support)

1. 
   DanH | Jul 19, 2012 07:38am | #4

   Yep, either do all the bending with PVC (at least 2 layers) or cut pieces of 2x to fit flat between joist ends and be scribed to the curve.  Use blocking rather than a rim joist to space the joists out near the edge.  You may want the joists closer together on the end where the curve goes parallel to the joists.

4. 
   dediver1995 | Jul 19, 2012 09:48am | #5

   curved deck bandboard

   Thanks to all who responded to my question.  I think after reading all of the replies, I will  run the joists wild, then mark the radius on them. Next I will cut them off and use 2X blocking, rather than trying to laminate strips of plywood together for a bandboard. I'm planning on using Azek  decking to  cover the curved edge/blocking. Hopefully I can get it to bend to a 6'6" radius without heating it.