Archive for the ‘Loft Insulation’ Category

postheadericon Does Loft Insulation Need Venting?

Ventilating your loft is part of an overall home maintenance strategy that works to keep your home more comfortable, your energy bills more economical and your insulation working at its maximum efficiency. Moisture and heat build-up in your loft from lack of adequate ventilation can cause problems, such as rot, for the structures in your loft. When insulation gets wet, it does not insulate to its full RF factor. When the weather is warmer, ventilation in the loft will keep your home cooler.

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Hot Weather Ventilation

The most obvious benefit of loft ventilation comes during summer, when the heat build-up in the loft can cause increasing heat in the home. The better your insulation, the more the heat transfer and the more you need to crank up the air conditioning or other cooling system to remain cool. By ventilating the loft, the heat is removed and the house is more able to stabilize in the cooler evenings. Ventilating with a steady flow of air is best if there are hot spots in the loft. Trapped heat can cause problems over the long term. Using strategically placed fans can help enormously.

Cold Weather Ventilation

During cold weather, when insulation is doing its job keeping your house warm, it is also trapping moisture in the house. Large amount of moisture are typically released in a household. With the windows shut and internal ventilation systems in lesser use, it flows upward toward the loft. The increased moisture can damage the beams, cause rot or mildew and create staining on the interior ceilings of your home. In addition, if your insulation is damp, this decreases its effectiveness and will cause you to increase the heat in the home, adding to your fuel bills. Thus, whether you use blown-in insulation or batts, keeping the loft ventilated is important to its proper function. Many insulations come with vapour barriers, but these are insufficient to stop the flow of moisture and should not be depended on solely. You should not depend, either, on natural air flow through your home for adequate ventilation, as newer construction has decreased the porosity of homes. A planned system of ducts and vents that takes advantage of natural air and moisture pressure differences by combining intakes and vents.