FoamSealR 3-1/2 in. x 50 ft. Multi-Use Ridged Sill Plate Gasket (12-Roll per Bag)

The instructions read, "ridged side toward roughest surface." Typically, this product is used laid horizontally (across) between the top of a concrete (or similar) foundation and a wood frame (the foundation and frame, collectively, are referred to as the "sill"). Since most store-bought, pre-cut, lumber (e.g., 2-by-4's) are smoother than poured concrete, you would lay the ridged side down atop the foundation, while the smooth side would rest against the smoother wood. The ridges act as "dams" to block water, soil, insects, etc, so, naturally, you want them where the terrain is roughest/bumpiest/etc, whereas putting the smooth side against the rough side would leave gaps that may allow water, soil, insects, etc. If both surfaces feel smooth or if in doubt, put the ridge side down. Some sills have two layers of lumber on top of the foundation; it's "okay" to put this gasket between the lumber, but, it, typically, isn't done. So, it isn't a matter of which surface to lay the gasket against; it's a matter of which surface is roughest. Easy to remember: ridge-to-rough.

Hello Brian, please contact gettech@owenscorning.com regarding your application. Thank you for your inquiry!

No, this is not insulation (even though HD seems to have it in that category). It prevents air leakage which may save on heating/cooling, and prevents moisture from migrating into your framing from the foundation.

Yes you could use it but EPS form board would be a better product to use has a better R- rating

To my knowledge, This is not an acceptable fire barrier to seal your top plate penetrations. I would suggest using the the "Great Stuff Fire Block" to steal those penetrations. This foam seal would not provide any use for you. The "great stuff" is expanding so an attempt at placing this on would not turn out like you hoped. This foam seal is used on the BOTTOM of your walls between the concrete and bottom plate to help seal it from pest and moisture intrusion. Using this on top would not provide any benefit that I can imagine.

That is exactly how I used it for my shed. I placed it under the pt lumber against the concrete slab to prevent moisture from coming in under the plate.

Yes, it is closed cell foam. Used between sill and footings or door sills.

I would imagine little to not at all. It's <1/4" thick and is designed to be compressed between the sill plate and foundation to fill gaps formed by uneven boards and rough concrete.

It depends on what materials are used and their purpose. Most residential, 2-4 story, construction zoning laws and codes, require something to be placed between concrete foundations and wood frames, or similar materials, while a foundation for a separate shed wouldn't. That "something" can be an adhesive, caulk, or something like this product or a vapor-type barrier. Commercial requirements are quite different, since their foundations, typically, have heavier loads, and simple adhesives or other barriers would be pointless. For the best answer, consult your local town hall, co-op/condo association, etc.

The only PT item should be the 2 x 6 sill plate itself.