Hi all - I recently saw a contractor installing baffles in an attic that didn't have soffit vents - they had gable vents. Do others see this? And are there real benefits to this, maybe by keeping the…Continue
"Sounds like a case of "old habits die hard". The sub contractor was probably just installing the things they've always been told to put in. Having no soffit venting is fine (my own 1930's home only has gable vents) but the attic…"
"This is true, it does happen, but it tends to not last very long as temperatures even out between inside and out, generally making it a non-event.
The leaky houses are the problem (in winter, up north), where an endless stream of warm moist…"
"Even in a cold attic above a tightly sealed house, you can have condensation in colder climates. Think of a relatively warm, sunny day in winter heating up the attic air as it exchanges with outside air. Warmer air can hold more moisture. At night…"
"Wet insulation = less R Value & if in direct contact with sheathing it can get soaked (it still can with a gap if it drops on it - but that means you have an even bigger issue) As you said it all depends on just how much water vapor /…"
"The question I have is - Where did the moisture/ vapor come from?
If you have a moisture problem in the attic the solution is not just to add a baffle so the insulation doesn't touch the sheathing.
A better question is why do you have warm…"
"The whole rationale for venting a roof is to provide a path for moisture to escape. The standards date back to the 1930s when fiberglass was beginning to be popular as insulation. Air moves through the fiberglass and if the roof deck is below the…"
"Ever seen insulation frozen to a roof deck? The problem at least further up north & shoot even other areas down south is moist air flowing through the insulation & then hitting the condensing surface. If said insulation is touching the…"
"Sean - I'm curious as to why you say the insulation should never touch the sheathing? That's one I haven't heard before. Insulation in walls touch the sheathing. I've never liked soffit venting, and…"
"Yes insulation should never touch the sheathing unless it is meant to & designed as a hot roof system. The other item is future proofing - they may close off gables &/or install soffit venting later or even add inline / intake/ eave…"
Hi all - I recently saw a contractor installing baffles in an attic that didn't have soffit vents - they had gable vents. Do others see this? And are there real benefits to this, maybe by keeping the insulation from touching the underside of the roof to protect it from extreme temps or condensation? Do others think the time/costs are worth it? See More
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