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[vicstric]

I am replacing some foam on some boat seats. How much allowance should I use on the seams over new foam and how much over finished size should i cut the foam to allow for good compression and fit?

[Adam12]

Box cushions or do they have plywood on the bottom to staple to?

[vicstric]

plywood bottoms

[Revv Up]

On a ply base I usually cut the foam to overhang 1/4” to 3/8” on all sides, then cut and sew the material to the size of the ply base. This allows a bit of stretch and the foam rolls over the edge protecting the material from wearing through on hard corners.

[vicstric]

Thanks @Revv Up !

[John]

I second @Revv Up