What to use under Superstreets for Noise Suppression?

I use Easyliner - it is a thin, perforated rubber foam sheet maybe 1/8 to 1/16 inch thick  made for drawer lining, etc..  I get it at Lowes.  I cut it to fit underneath the pieces as I lay down the track.   I have to screw the pieces down which makes a hard mechanical contact from track piece to benchwork and that probably transmits noise somewhat, but this seems to help.

They also sell a thin under layment in the tile aisle. If you want something thicker, there is the pink foam sill under layment which is about 1/4 inch thick and about 8 inches wide.. 

Lee, could you glue to the rubber backing and avoid the screws?  It works pretty well with track, don't know about SuperStreets.

Hi Lee: 

Thanks for your response and also to the other responders.  I will try that.  I was down at Lowe’s last night and didn’t see that product.  I guess I didn’t look in the right department.

Before posting this question I reread your article in OGR Run 256 and unless I missed it there was no mention of any material under the “streets” other than wood.   

Regards,

Bill  

I've used Liquid Nail and it works well, yes.  Takes a long time to harden though, and often I screw it down timorarily to cinch it down tight until the glue dries (and yes, I have forgotten to remove the screws sometimes).  Glue does avoid needing to screw it down but is not a lot quieter.  Not that it could be: I don't have much of a noise problem with 'Streets track (maybe it is because I do use that rubber sheeting, I don't know since I have never not used it or something similar), so I'm not loath to screw it in place when I really want it to stay there.

You make excellent points Lee, one size truly doesn't fit all.   I have tried tubular track with adhesive on rubber laminate floor underlayment, it did make quite a difference in the sound levels.  I'd just put a bead of silicon caulk under each tie.

I think a bead of caulk would work well: it would both hold in place once hardened, and isolate for sound, too.  But I have not had noise problems with 'Streets like I did with Fastrack so I haven't tried it . . . I might though - an easy and quick method given that you have time to let the caulk harden for a  day or so, which I certainly do. 

I suspect not nearly as many wheels at one time are running on the SuperStreets, so the noise would be less of a problem.