R-13 EcoTouch PINK Unfaced Fiberglass Insulation Batt 15 in. x 105 in. (10-Bags)

105" is for 9' ceilings but it is unfaced.

This insulation can be used for exterior or interior use. If you require moisture control in your space then you will need to add facing as this is unfaced insulation.

the sq ft per package will determine how much product is needed

88 feet lineraly

NO

105. 56 square feet per package. each batt is 15 inches by 93 inches with 11 sheets per package.

The question you ask is unclear. But each package will cover 105.56 square feet when layed out flat and no cuts. As the package states each sheet is 15 inches wide by 93 inches long and a package contains 11 sheets.

Measure the depth by the width of the area you want to insulate in attics and duplicate that for each layer you want to apply. For walls measure the height x width. The total will give the square feet of the area. Then subtract 105 for each package of insulation as that's the area a package will cover. Keep in mind this is R-13 and depth varies somewhat according to the R factor. This product is approximately 3.5 inches in depth which should be ideal for 2x4 studded walls. Some homes have 2x6 studs that would require a thicker insulation or you would need to double layer this product.

Hello Larry, we do not recommend placing fiberglass batts between 2 vapor barriers, nor do we recommend trapping a vapor barrier between two layers of insulation. This could trap moisture and provide an environment for mold and mildew to grow. Removing the vapor barrier on the current insulation and adding a faced batt on top with the facing towards the conditioned part of the home would be a more suitable option. Thank you for your inquiry!

I would not advise to. I saw in the store that there was a section designated FOR attic insulation, so I would choose one those products instead