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<blockquote data-quote="JayKay" data-source="post: 318529" data-attributes="member: 324">Yes, lack of venting, along with not enough insulation, are the culprits.&nbsp; Nails sticking down through your roof deck will each have a big ball of frost on them.&nbsp; When it warms up, the frost melts and drips down onto the insulation, packing it down, making it worse.&nbsp; Loft, just like in a goose-down jacket, is key.&nbsp; Water will flatten the insulation, decreasing loft.&nbsp; The best insulator is dead air space, and the dead air space comes from loft.When the insulation dries, it does not &quot;fluff back up&quot;.&nbsp; You will see big gains in efficiency if you add insulation.&nbsp; 15&quot; would make a huge difference.&nbsp; To some extent, the more you put in, the better off you will be.If you don't have vents in your soffit, then adding attic chutes will make no difference.&nbsp; If you have vented soffit, then adding chutes will make a huge difference, but there needs to be enough of them, on opposite sides of the house (think: upwind and downwind) to allow air to flow through.Someone above mentioned that the air in your attic should be the same temp and humidity as outside air.&nbsp; That is exactly right.</blockquote>

[QUOTE="JayKay, post: 318529, member: 324"] Yes, lack of venting, along with not enough insulation, are the culprits. Nails sticking down through your roof deck will each have a big ball of frost on them. When it warms up, the frost melts and drips down onto the insulation, packing it down, making it worse. Loft, just like in a goose-down jacket, is key. Water will flatten the insulation, decreasing loft. The best insulator is dead air space, and the dead air space comes from loft. When the insulation dries, it does not "fluff back up". You will see big gains in efficiency if you add insulation. 15" would make a huge difference. To some extent, the more you put in, the better off you will be. If you don't have vents in your soffit, then adding attic chutes will make no difference. If you have vented soffit, then adding chutes will make a huge difference, but there needs to be enough of them, on opposite sides of the house (think: upwind and downwind) to allow air to flow through. Someone above mentioned that the air in your attic should be the same temp and humidity as outside air. That is exactly right. [/QUOTE]

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