How do you fasten 2 foam insulation?

To attach the insulation, you can use screws with large washers, a special adhesive made for adhering foam board insulation or, for smaller pieces, you can seal them in with caulk or spray foam.

Which side faces out on foam insulation?





If you’re wondering whether to put the foil side of foam insulation board shiny side in or out, consider whether you want to make the space inside warmer or cooler. If you want to make the space warmer, the foil should face inside so it can reflect radiant heat back into the room.

How do you apply foam board insulation?

Quote from the video:
Quote from Youtube video: You can install eco touch pink fiberglass insulation between the wall studs if a higher level of insulation is desired then finish by installing chips and drywall.

What is the R-value of 2 inch foam board?

Foam Board Insulation R-Value per inch

Thickness (in Inches) R-value (in I-P/Imperial) RSI (R-value in Metric)
1.0 6.2 1.08
1.5 9.3 1.62
2.0 12.4 2.16
2.5 15.5 2.7

How do you fasten a 2 inch foam board?

Use 3/8-inch head galvanized roofing nails or 1-inch crown, 16-gauge staples or plastic cap nails to attach the panels to the wall. Space the fasteners at least 24 inches apart along the studs. Use a utility knife or handsaw to trim the boards to fit around windows and doors.

Can you screw into foam insulation?





Because the surface of foam insulation board is porous, the head of a nail or screw will go right through the foam board without a washer. Washers for foam board don’t have a hole in the middle; they are simple steel discs that measure about 2 or 3 inches in diameter.

Does it matter which way insulation faces?

Regardless of whether fiberglass insulation is installed in a wall, attic, or crawlspace; the paper facing should always face toward the inside of the home. That’s because the paper contains a layer of asphalt adhesive which prevents water vapor from passing through it.

Do you need a vapor barrier with foam board insulation?

Foam insulation usually does not require a vapor barrier. For some foam insulation types, such as closed-cell spray foam and foam board insulation, the insulation itself stops the movement of most water vapor.

What is the difference between pink and blue foam board?

Both are manufactured using the same process and contain similar chemical components. The two products also have the same insulating power. However, blue foam boards are manufactured by Dow Chemical Co. whereas the pink foam boards are manufactured by Owens Corning company.

How do you install rigid foam insulation?



Quote from the video:
Quote from Youtube video: Position the board's vertically. Using a level to ensure they are plumb against the wall. Notice how the notched edges fit together to create an insulated channel with no energy robbing air gaps.

Does rigid foam insulation need to be covered?

Tests have shown that these laminated boards can withstand UV ray damage for a reasonably long time. That said, it’s still advisable to cover any foam board insulation exposed to the Sun within 30-60 days at the most. On most projects, that’s more than enough time to finish the exterior walls.

How do you install rigid foam insulation between rafters?

Quote from the video:
Quote from Youtube video: You're going to need some aluminium tape to taper up the joints later on and possibly some expanding foam just to fill any small gaps we have prior to putting on the tape.

How do you attach rigid foam to a roof?



Tape seams in rigid foam. Install vertical purlins (furring strips).



Above Deck Rigid Foam Insulation for Existing Roofs

  1. Remove existing roofing and non-adhered underlayment to expose roof sheathing.
  2. Apply continuous air control membrane to existing roof sheathing or implement continuous air control at roof sheathing.

How do you attach foam board to ceiling?

Quote from the video:
Quote from Youtube video: And super gluing it to the foam. And I find Gorilla Glue works great but any kind of really strong glue. I would go ahead and use and then you can actually use one large strip and cut it in half.

Can you put insulation on the underside of a roof?

Open-cell spray polyurethane foam or closed-cell spray polyurethane foam (ccSPF) insulation can be sprayed along the underside of the roof sheathing to provide a conditioned and insulated attic space that can be durable and efficient in all climate zones (see Figure 1).

Is it better to insulate ceiling or roof?

If you are deciding between insulating the roof deck or the ceiling, Insulating your ceiling should be the priority. Not only is it easier but ceiling insulation is beneficial in a number of ways: Keeps the temperature in the building regulated. Saves on energy costs.

Is it better to insulate attic ceiling or floor?



roof insulation is no-contest. The floor wins every time. Insulating the floor is standard practice for an unfinished attic space. The exception to this rule takes place when families opt to convert an unfinished attic space into something usable or livable.

Should you insulate between roof rafters?

The general advice we give is that you should always insulate between and above the rafters (warm roof) or between and under the rafters (cold roof).

What thickness should roof insulation be?

Achieving a U value of 0.20W/m² (meaning your roof will be better insulated than your walls) will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. Hitting amazing levels of 0.13W/m² will need 300mm of mineral wool or 180mm of rigid foam.

Does a roof need to breathe?

But the house also needs to breathe, and most of that important breathing happens in the attic. Unless the attic is well ventilated, this leads to high cooling bills, ice dam formation and deterioration of rafters, roof decking, etc. from moisture.