Yes, too much insulation can cause condensation. This is because over-insulating leads to poor ventilation inside a house and as a result prevents the humid air from escaping outside and becomes more prone to condense on cool surfaces and walls.
Does Loft Insulation Directly Cause Damp? The simple answer to this is no. Loft insulation in itself is not responsible for damp appearing in your property – however, it can be a contributing factor when it comes to the spread of damp via condensation.
As long as you ventilate your property properly, you can have as much insulation as you like within reason. The trick with loft insulation is to balance the amount of insulation you have with the amount of ventilation necessary to prevent damp. As long as you get that balance right, you should be fine.
Moisture and insulation
Improperly installed insulation is one of the leading causes of condensation in the attic, especially when too much insulation traps warm air up near the roof and forces condensation.
It is possible to over-insulate your house so much that it can't breathe. The whole point of home insulation is to tightly seal your home's interior. But if it becomes too tightly sealed with too many layers of insulation, moisture can get trapped inside those layers. That's when mold starts to grow.
The most obvious difference offered by an insulated loft is the saving in energy bills, and it's very simple here. It's estimated that a quarter of all the escaping heat from a building goes through the roof. If that could be stopped, your bills should be reduced by a quarter.
The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.
However, when moisture fills the air pockets between the fibers, the insulation loses its ability to slow the transfer of heat. After all, water is a conductor, so wet fiberglass insulation is about as effective as no insulation at all. To help fiberglass insulation dry out, place a dehumidifier or fan in the area.
Too much insulation and a lack of ventilation and your home may experience issues such as stuffy, stale and unpleasant air along with related problems such as condensation, mould and damp.
Open the windows at the first sign of moisture, and use fans to help speed drying. Throw away any insulation or other materials that are wet or show signs of mildew, but be sure to replace them immediately. A dehumidifier can also help remove moisture from the attic fairly quickly.
So why does it happen? Condensation will form in your attic if warm moisture laden air comes into contact with a cold surface. In the real world this means moist air from your house coming into contact with the underside of your cold roof tiles or the side of your water tank etc.
Insulation needs to be breathable. It also needs to discourage condensation. Modern insulation is the work of the devil in this regard.
However if you've added anything that could have made the loft area cooler (such as increasing loft insulation) or reduced the effectiveness of the existing ventilation (such as fitting insulation that partially or completely blocks existing vents) then you'll probably need additional ventilation.
The simple answer is 'yes'. Insulation is not designed to last forever, eventually it will begin to degrade and whilst you may not always be able to see the deterioration, you'll certainly notice it.
The majority of insulation products can last between around 80 to 100 years, which is definitely impressive.
Refrigerant dehumidifiers work well in areas of high humidity and when temperatures are above freezing, around 5-30℃. A refrigerant dehumidifier would be ideal for a loft or attic that does not tend to be too cold at any time during the year.
Attic condensation generally happens during winter & spring months when warm, moist air from the main living area rises into the attic space. When that warm, moist air meets the chilly underside of your roof's deck, condensation occurs.
Installing Insulation
Improperly installed insulation can have a negative effect on a home with regards to mold growth. For example, gaps left in the insulation can create cold spots that can lead to condensation and surface mold growth.
In other cases, there might be a leak in your pipes. Regardless, now your cellulose insulation is wet! If you're wondering how long it takes for it to dry, we've researched this to find out. In an ideal circumstance, cellulose insulation should take around 24-48 hours to dry.
Even if you must remove most or all of the insulation, it's sometimes possible to dry out and replace the same fibers—that is, after you thoroughly clean and dry the mold-damaged space.
Your insulation needs to be removed along with the droppings, as it'll carry some of its toxicity if left in your attic. Removing old insulation and replacing it with new ones will not only rid your home from any rodent infestation and mold, but also improve its energy efficiency and overall air quality.
One of the places in your home where a little bit of attention can make a big difference in your comfort — and heating bill — is the attic. According to the Department of Energy, properly insulating the attic can save 10 to 50 percent on a typical heating bill.
The Department of Energy estimates that a properly insulated attic can shave 10 to 50 percent off your heating bill. And it works the opposite way for warm climates; in summer, it helps stabilize your house's indoor temps to keep cooling needs in check.
As a general rule, insulation should be replaced or retrofitted every 15 to 20 years. However, it may need replacing or retrofitting sooner depending on the type of insulation installed, the R rating of the original insulation, compression and movement over time, and whether any damage has occurred.