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Which holds up better over time: felt or synthetic underlayment?

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mountaineer21
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I had no idea low slope would be such a pain until I bought this place. My inspector just kind of shrugged and said “keep an eye on it.” Fast forward to last spring—surprise, water in the attic. I swapped to synthetic too, but now I’m paranoid about ventilation. Anyone ever actually fix attic airflow themselves, or is that a pro job?


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stormphillips442
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I get the paranoia—low slope is just a whole different beast. About attic airflow, I wouldn’t say it’s always a pro job. Depends how handy you are and what you’re working with. I’ve seen folks add baffles and extra vents themselves, but cutting into the roof or soffit can get sketchy if you’re not comfortable. Just be careful not to overdo it and mess up the balance. Sometimes too much venting can cause its own problems, especially with synthetic underlayment since it’s less breathable than felt. It’s a tradeoff, honestly.


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benp32
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Yeah, I hear you on the venting—too much of a good thing can backfire, especially with synthetic underlayment. I swapped out old felt for synthetic a few years back thinking it’d be a “set it and forget it” deal, but my attic got stuffier than expected. Had to tweak the vents after the fact. Felt breathes better, but man, it tears so easily if you’re not careful. Synthetic’s tougher, but you’ve gotta watch that airflow or you’ll cook your insulation. Always some tradeoff, huh?


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