- Can you put too much insulation in attic?
- Can you put plastic over insulation in attic?
- How thick should closed cell insulation be?
- Is faced or unfaced insulation better?
- Is it better to remove old insulation?
- Do you need a vapor barrier for ceiling insulation?
- Should you put plastic between insulation and drywall?
- What happens if insulation is installed backwards?
- Should I remove old insulation before blowing in new insulation?
- Should attic insulation be faced?
- Should insulation paper face in or out?
- Do vapor barriers cause mold?
- Which way do you face foil insulation?
- Where should faced insulation be used?
- Does it matter which way you install insulation?
- How can you tell if insulation is bad?
- What side does vapor barrier go on insulation?
- Can you remove facing from insulation?
- Do you need vapor barrier for blown insulation?
- Can I put new vapor barrier over old?
Can you put too much insulation in attic?
But there may be a theoretical point of “too much.” If a home is over-insulated and is too tightly sealed, moisture can get trapped inside.
Without proper ventilation, a home can build up too much moisture, especially in the attic (warm air rises), which can cause mold problems and, overall, lower indoor air quality..
Can you put plastic over insulation in attic?
Once you talked about stapling down sheets of plastic over rolls of insulation. … In any case, a vapor barrier always faces the heated side, so it would never be put on top of batt insulation in an attic.
How thick should closed cell insulation be?
Closed cell spray foam should be 4- to 5- inches on the ceiling and 2- to 3-inches in the walls. This might come as a surprise to you, but honestly, this is all the spray foam it takes to get the biggest bang for your buck with the air seal and thermal resistance needed for certain areas of the home.
Is faced or unfaced insulation better?
Faced, or the type with paper, is typically used in first-time applications, such as in walls, ceilings, floors, and in crawl spaces. Any time you use a faced insulation, the paper needs to be facing toward the living space. … Unfaced is also your best choice for adding soundproofing to interior walls.
Is it better to remove old insulation?
Yes, you probably need more insulation added (air seal the attic floor first) but even old insulation still has its R-value, or insulative properties. Unless it’s water damaged or rodent-infested, you do not need to remove your attic insulation.
Do you need a vapor barrier for ceiling insulation?
All attics — vented or unvented — should have an air barrier (a properly detailed airtight drywall ceiling, for example) regardless of climate. Omitting a ceiling vapor barrier by arguing that “you have to let the moisture escape” or “because the house has to breathe out the top” is actually correct, in a way.
Should you put plastic between insulation and drywall?
The standard installation of a plastic vapor barrier is between the studs and the drywall, but there are some exceptions to this. In exterior walls that are below-grade, like basement walls, plastic should not be used at all. Some applications require a different use of plastic vapor barriers.
What happens if insulation is installed backwards?
In an upside down installation, where the paper faces the unheated portion of the home, moisture from the humid inside air can condense and become trapped inside of the insulation during cold winter months. This will likely result in fungal growth (mold) and rot.
Should I remove old insulation before blowing in new insulation?
According to ENERGY STAR®, you can put new insulation over old insulation, “unless it is wet. … “Faced” insulation should not be placed on top of existing insulation in the attic. Any new roll or batt insulation installed over existing insulation in the attic needs to be without a vapor retarder (face).
Should attic insulation be faced?
When using insulation that has paper or plastic batting, that moisture barrier should face outward toward the attic space. Even if the attic space is unheated, it’s typically warmer than the outside air in winter.
Should insulation paper face in or out?
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 vapor barriers cause mold?
The Problem With Vapor Barriers This can lead to significant moisture problems and mold; problems occur when walls get wet during construction or more often throughout the home’s life. These wetting cycles can be from air flow, window leaks, pressure imbalances, and a host of lifestyle issues.
Which way do you face foil 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.
Where should faced insulation be used?
Kraft-faced insulation should be installed in exterior walls, exterior basement walls, and attic ceilings by pressing the product into the wall cavity with the paper side facing outward, towards the installer. The insulation should be snug in the cavity, but not compressed.
Does it matter which way you install insulation?
The first layer should have the facing against the drywall to act as a vapor barrier. (The general rule for insulation is that the facing always goes toward the conditioned space.) The second layer of insulation should be unfaced so that moisture doesn’t collect between the layers.
How can you tell if insulation is bad?
The walls, floors and ceilings of your home should feel warm and dry to the touch. When drywall and panelling inside a home feels damp or cold, that’s a clear sign there’s not enough insulation. Alternatively, when touching an exterior wall, it should feel cold because insulation is keeping warm air inside a home.
What side does vapor barrier go on insulation?
warm sideIn order to prevent condensation from forming, a vapor barrier should be placed on the warm side of your insulation to stop warm, moist air from condensing on a cold surface inside your wall. In cold climates like Canada, for most of the year the vapor barrier should be on the inside of the insulation.
Can you remove facing from insulation?
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.
Do you need vapor barrier for blown insulation?
A common misconception is that vapor barriers are required in all insulation installations. With Modern’s Cellulose insulation, a vapor barrier is not recommended except in very cold weather or high moisture areas such as spas or pool buildings. … Cellulose insulation has a high density compared to fiberglass.
Can I put new vapor barrier over old?
When you can’t remove the old plastic, you can go ahead and cover it. Just be sure it doesn’t lead to too much excess material for the replacement. When you install a vapor barrier that has wrinkles or raised portions it is more vulnerable to tears.