Attic Insulation Moisture Problems

In order to avoid attic condensation it is important to make sure that the attic receives proper ventilation and that it is properly protected from the outside elements.

Attic insulation moisture problems.

It has a relatively high vapor permeance 3 perms at a thickness of 6 allowing water vapor to migrate to the roof decking at night and back into the attic air in the daytime. In fact spray foam insulation can help avoid problems like these. Open cell spray foam insulation doesn t store the moisture. Signs of condensation in the attic may include the following.

Rust moisture frost and ice buildup on roofing nails dark stains moisture or frost on the roofs sheathing water or drip marks scattered on the attic floor buckled or damaged roof sheathing moist or wet insulation. Noticeable musky damp odor. Two of the most common causes of attic condensation are high levels of humidity within the living spaces beneath the attic and moisture seeping in through the roof. Traces where water has trickled down the walls.

It s the wood decking that stores the moisture though. Loose fill or batt the common term for blanket insulation. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. For diy attic insulation you ve got two choices.

It s just a pathway. If anything outside air passing through the attic tends to dry it out because that cold dry air sucks the excess moisture from the attic. This is why attics are ventilated with outside air. How can i tell if i have moisture problems.

Bad attic fan bad. Moisture forming on the glass window panes or other flat surfaces. Common signs of moisture in your attic musty smells frost ice on cold surfaces in the wintertime foggy windows condensation on windows or other smooth surfaces visible mold wood rot the deterioration of masonry the staining discoloration or warping of construction materials. Attic moisture can also contribute to ice dams.

Insulating with spray foam insulation at the roof line will cause moisture problems with the roof sheathing. Additionally moisture can lead to mildew and mold growth which can exacerbate health problems for occupants. Attic moisture during the winter can decrease the effectiveness of insulation and over time cause significant damage to structural elements in the attic including rafters and trusses. The first signs of a condensation problem in your attic might show up during a re shingle on your roof.

In fact the attic is almost always warmer than the outside so it warms the air allowing it to hold more moisture.