3/4 in. x 4 ft. x 8 ft. R-2.89 Foam Insulating Sheathing

Typically a water based adhesive works best when adhering R-Tech to a garage door. Below is a link the the Insulfoam Technical Bulletin listing the compatible adhesives. https://www.insulfoam.com/wp-content/uploads/2014/04/TB26-EPS-Compatible-Adhesives.pdf

Dear Jeffrey: You have the right idea, but you should use Foamular XPS foam board instead. XPS provides R-5 per inch of thickness and does not absorb moisture, so this would be ideal for your walk-in cooler. See: Foamular 250 Model # 52DD, Home Depot Internet #202085962 Store SKU #307101 Also make sure your seal the joints between the foam board panels, to block air leaks. DAP 230 is good for joints and small gaps. The 'Window and Door' version of Great Stuff foam is good for larger gaps. Both must be applied above 55 degrees -- so your walk-in cooler would need to be turned off. I hope this is helpful, Mark

Dear Melva: No. First, if the RV is mobile it would be very difficult to fasten foam board securely to the frame -- to avoid flying foam board on the highway. Second, foam board is very flammable and emits toxic gas when it burns. In homes and garages it MUST be covered by an approved thermal barrier. The standard is 1/2" drywall, which obviously will not work under an RV. Unfortunately, insulating an RV or trailer is difficult because the walls are so thin -- and insulation depends on thickness. If you have the ability to open the walls, floor and ceiling, the best option is Roxul rock wool. It provides R-4.1 per inch of thickness, which equals R-tech foam board -- but Roxul is not flammable. Plus you can easily stuff it into nooks and crannies; Roxul is much denser than fiberglass and molds kind of like clay. A board-like version is also available from Home Depot for larger flat areas: Roxul ComfortBoard sheathing. See: Roxul ComfortBatt Model # RXSS31525, Home Depot Internet #202531875 Store SKU #982937 Roxul ComfortBoard Model # RXCB11224, Home Depot Internet #206789748 Store SKU #1001748089 I hope this is helpful. Mark

At present this product does not come in 2 inches thick.

Dear ColdGarage: You have the right idea; here are some suggestions: (1) Insulate the water pipe: First, start by insulating the water pipe to your washing machine. Rubber foam sleeves are the best option. See: ArmaFlex Model # HST05812 Internet #100550644 Store SKU #420373. Even though the seam is "self adhesive", use foil HVAC tape to permanently seal the seam. See: Nashua Model # 1207792, Home Depot Internet #100030120 Store SKU #915245 (Avoid the cheaper poly foam sleeves.) If you live in an area with very cold winters, you can boost the insulation by adding a second layer for straight sections. See: ThermWell Model # F15XAD Internet #100162619 Store SKU #170795 (Note: if you decide to also insulate the entire wall as described in #3, below, fill the gaps around your pipe insulation with DAP 230 and Great Stuff foam.) (2) Garage walls: Are your garage walls "open"? In other words, can you see the studs or are they covered by drywall? If they are covered, and your key issue is the water pipe to your washing machine, then focus on insulating the water pipe -- because insulating the garage walls will be much more costly. See #3, below. (3) Insulate your garage walls: If your garage walls are 'open' (or you want to insulate the walls anyway), then foam board is a great solution. Fill the stud bays with pieces of foam board, and carefully seal all of the edges and joints to block air leaks. DAP 230 sealant is good for small gaps. The 'Window and Door' version of Great Stuff spray foam is good for larger gaps. We also recommend Tuff-R foam board, which provides significantly better insulation R-value per inch: R-5.5. See: Tuff-R Model # 268441 Internet #100322376 Store SKU #163832 If your winters are very cold, you can use two layers of foam board - 1 7/8" plus 1" -- to nearly completely fill a standard 2" x 4" stud bay. We recently completed a similar project in Massachusetts; a photo is attached. You must, however, cover the wall with new 1/2" drywall are you fill it with foam board -- because foam board is flammable. A final note: If your garage walls are covered by drywall, it must be removed to add insulation; you cannot simply install sheets of foam board on top. This would create a major fire safety risk and building code violation. You will need to remove the drywall, fill the stud bays with foam board, then install new drywall, as described above. I hope this is helpful. Mark

Dear Maria: Yes. Home Depot sells another foam board product that would be a better choice, however: Foamular 250. This XPS foam board is denser and tougher, and does not absorb moisture - perfect for a doghouse. I hope this is helpful. Mark

Yes, this can be used to insulate an attic knee wall.

Yes it can go over cinderblock. However, it will probably not solve the condensation problem and may lead to mold between the insulation and wall. To reduce or elimate the condensation, you may want to paint the walls with waterproof paint and/or run a dehumidifier or two down there.

Thank you for your recent inquiry with The Home Depot, Dee. This Foam Insulating Sheathing is only carried in select Home Depot stores and not online. If they are not carried in your store, a specialist in your store may be able to special order them for you. Special orders are not available online. We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.

Dear Nukem: Yes, but 1" XPS (Foamular 250) foam board would be a better choice. It provide R-5 per inch of thickness. See: Foamular Model # 86BG, Home Depot Internet #100320343 Store SKU #465124 Store SO SKU #192627 As you noted, screw or nail the foam board to the bottom of your floor joists. Carefully seal all of the edges and joints to block air leaks. DAP 230 works well for small gaps. The 'Window and Door' version of Great Stuff foam is good for larger gaps. Foam board is flammable and should never be installed near any source of heat, e.g. a furnace or vent. Use Roxul ComfortBoard or ComfortBatt near sources of heat. Have you also insulated the roof of your shed? This is much more important for temperature control than the floor. 2" thick XPS foam board would be a good choice here as well. It must be covered by 1/2" drywall, however, for fire safety. I hope this is helpful, Mark