Most types of insulation come as faced. Faced just means that kraft paper is attached to the insulation itself. The paper helps improve the sturdiness of the insulation so it doesn't fall down as much. Unfaced insulation is just as good as faced, but it doesn't have that paper attached to it.
The facing paper on the insulation blocks moisture from condensing (changing from a vapor to a liquid) on the insulation. If installed incorrectly, moisture can become trapped between the facing and cause mold, rotting, and reduced R-value.
Luckily, the Kraft paper facing is easy to remove. Simply pull on the facing with one hand and use the other hand to push the batt or roll away from the facing. Then, you'll be able to proceed with the repair.
Foil faced insulation not only slows the transfer of the heat but also acts like a mirror reflecting heat back to where it came from. In fact, it reflects about 95% of the infrared heat that hits its surface.
Unlike faced insulation, unfaced insulation is non-combustible since it does not contain any combustible materials such as paper or plastic. Also, as mentioned above, unfaced insulation is much cheaper than its faced counterpart. Additionally, unfaced insulation is a great way to soundproof your interior walls.
Kraft-faced insulation includes a vapor retarder which helps with moisture migration from unconditioned outside air. Install kraft-faced batts with the paper facing toward the inside of the home.
The answer is yes, you can put new insulation over old. But there are some circumstances that would require insulation removal first, such as in the case of contaminated insulation from pests, water or smoke. Moisture is the biggest culprit, as it can lead to mold and mildew, as well as ceiling and roof rafter rot.
So, any time you use a single side foil insulation, the foil needs to be facing toward the living space. So in a loft the foil faces downward. If you install double faced insulation it doesn't really matter which side is out. Neither side does the same job.
One of the disadvantages of foil insulation is that it is not as effective against convection and conduction as it is against radiant heat.
When it comes to foil insulation, it's generally recommended to leave an air gap of at least 25mm (1 inch) between the foil layer and the surface it's installed on. This allows the foil to reflect radiant heat, rather than simply absorbing it.
According to CPSC staff, the paper vapor barriers, if installed incorrectly and accidentally ignited, could cause a fire. Paper barriers, which cover one side of some fiberglass and mineral wool insulation, prevent the product from soaking up moisture and retarding its effectiveness.
REMOVE THE BACKING
Once the top layer of wallpaper has been peeled off the wall, it may leave a paper backing behind. This can be taken off using steam or with warm water and a sponge.
Faced insulation
Kraft and standard foil facings can burn and must not be left exposed. If an exposed application is required, use FSK-25 flame-resistant faced insulation.
R13 insulation is generally more affordable, which makes it an attractive option for budget-conscious projects. However, R19 insulation offers better long-term advantages because of its higher R-value.
You should install two layers of insulation in your attic; wood joists must be covered to allow the air to move. The first layer will sit between the joists, and the second layer will run perpendicular over the joists. The first layer should have the facing against the drywall to act as a vapor barrier.
Should I Put Vapor Barrier Plastic Over Insulation Before Drywall? Yes, covering your insulation with a vapor barrier plastic before installing drywall is crucial. It prevents moisture buildup that can lead to mold, rot, and even structural damage.
Foil is a low emissivity material
This means that adding a foil facing to insulation can significantly improve the U-value of the construction. This enables a thinner insulation to be used to achieve the same U-value.
Simple! Bubble wrap is a natural insulator. The layer of trapped air in the bubbles forms a barrier that keeps warm air in and prevents the unwanted cold from entering. Many Aussie homes are built with single glazed windows which are an excellent conductor of heat.
With easy installation, energy savings, and positive customer reviews, Thermawrap stands out among other insulation options.
One of the key benefits of insulated plasterboard is the option for foil-backed varieties, which serve as a built-in vapour barrier. However, it's important to keep in mind that ensuring the continuity of the vapour barrier at joints can be a challenge.
AP™ Foil-Faced insulation must be covered with an approved thermal barrier and cannot be left exposed. Safety glasses with side shields are recommended to keep dust out of the eyes. Leather or cotton gloves should be worn to prevent skin contact and irritation.
What is the difference between unfaced and Kraft-faced insulation and how is it installed? Unfaced means the insulation lacks a vapor retarder (paper or plastic facing). Kraft-faced insulation includes a paper vapor retarder, which helps prevent mold and mildew.
While both types provide insulation, R30 is the better option for maximizing energy savings in areas where heat loss or gain is a major concern. For example, R19 may suffice for interior walls, but R30 is more appropriate for exterior-facing attics or floors.
Adding two R-13, 3.5” batts to a 2”x6” (5.5”) wood stud cavity will not provide an R-26. The total of 7” of insulation is reduced in thickness to 5.5” thereby losing the R-value associated with its full thickness.
Removing old insulation is generally recommended if it's damaged, contaminated with mold, or infested with pests. However, if the insulation is in decent shape and just needs a boost, adding a new layer on top can be a cost-effective option.