Foam Question

[Phan000]

I am in the process of rebulilding my deck, and have grinded, chisled and scraped out all of the old balsa core.

I left the bottom layer of glass mostly intact so that the new wood has something to bond to. Most of the bottom glass is well supported by stringer and foam underneath, but in a couple of spots the foam is several inches below the glass causing it to flex.

[image]ttp://i3.photobucket.com/albums/y54/Phan000/P1010027.jpg[/image] Should I cut all of these spots out and pour in new foam, or just drill holes and pour foam in that way?