I went to Lowe's to price materials for the bench work and found this, It seams this may work instead of using the foam insulation.
http://www.lowes.com/pd_15387-157-00634_4294858109_4294937087?productId=3014222&pl=1¤tURL=/pl_Acoustic%2BInsulation_4294858109_4294937087_?cm_cr=Insulation-_-Web Activity-_-Insulation Accessories _A1_Activity-_-SC_Insulation Accessories_Area1-_-22108_3
Thanks
Les
http://www.lowes.com/pd_15387-157-00634_4294858109_4294937087?productId=3014222&pl=1¤tURL=/pl_Acoustic%2BInsulation_4294858109_4294937087_?cm_cr=Insulation-_-Web Activity-_-Insulation Accessories _A1_Activity-_-SC_Insulation Accessories_Area1-_-22108_3
Thanks
Les