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zoinkability t1_is1bvp5 wrote

Ideally you'd put vents into the soffits and use baffles like this: https://www.doityourself.com/stry/installing-attic-insulation-baffles

If you can't or won't put in vents, it's still best to install baffles to ensure that the insulation does not touch the underside of the roof decking.

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GeoffdeRuiter t1_is1hxw9 wrote

u/jjax2003 You definitely want to put in the baffles like in the picture above. You will have mad condensation issues if you don't and water will condense on your roof sheathing and drip down and saturate your insulation and eventually moisturize your ceiling in the house = mold. You can never have too much ventilation in an attic, but you can have too little. :)

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madcaesar t1_is31559 wrote

Do baffles go between EVERY stud or do you just need a few in each side of the house?

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zoinkability t1_is34e1l wrote

Every stud, ideally. Any area between two rafters without a baffle is a spot where the insulation can trap warm air and moisture against the underside of the roof decking. If your insulation isn’t deep enough to touch the underside of the decking it’s not as much of a concern.

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