Probably yes
Hi there,
What you are talking about is a "feather" under the track. I don't know the properties of Starboard, but if it is truly non-absorbent, and won't fracture from lateral loads on fasteners, it might be ideal. You might also consider Schaefer's Battslide Track. 7/8" track has undergone a major dip in quality control since the time Martha had some installed. And even at the best of times it could stick. But Schaefer's track is smooth, with perfectly-aligned joints. Easy to install, too. It's also my preferred trys'l track.
Yours,
Brion Toss
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