what is the "membrane"? We are just getting ready to install the armstrong luxery alterna vinyl tile and have not read about this step. We will be putting down (with nails) an underlayment wood (luana type) board and than using the provided adhesive.

Please help! I am very anxious to do it right.

Thanks - Pam

You mean grout like the Congoleum Dura-Ceramic uses?

About a year ago, we did Armstrong Alterna in our bathroom. No water issues at all, no mention from the flooring store about any kind of plastic membrane, it's glued direct on the plywood underlay.
Floor looks great, grout has been easy to clean, but I'm a bad judge of that - I have very low standards for "clean"! I'm very pleased with it, we just picked a different color of Alterna for our kitchen remodel.

we have a gray armstrong vinyl tile with a white color grout. They told us the grout was partially silicone-based and wouldn't discolor and stain like normal grout. They lied. Granted, it isn't the same, but it IS cream colored now from sand, dirt, etc. I did read that you can seal the grout after they put it in, and that is probably what we should have done. I plan on really cleaning it well and then sealing it. The nice thing is that a magic eraser cleans it up and brightened it well, and although, tedious a bit, it was cheap and easy enough to do. we also have 3 dogs and cats and kids.

We have Armstrong tile that was grouted and it never looks clean. I would not recommend