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A W10 x whatever steel beam forms the front edge of my porch roof. It’s topped with a PT ledger and TJI’s rest on that. The steel is boxed in with plybead on the porch side (to match the porch ceiling) and stucco on the more exposed side. My question is about what to do to cover the bottom side of the beam. I doubt I should just box it in be/c then there is no air flow. One idea is to use the perforated vinyl soffit material. How much of the perforated alternated with how much of the non-perforated is recommended to get sufficient air? Another idea is to use plybead and then cut in vents here and there. How many vents in a 63′ length of beam?
Asked another way, how much venting is sufficient to avoid trapping moist air in a boxed-in steel beam?
Thanks,
Jim
Replies
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A W10 x whatever steel beam forms the front edge of my porch roof. It's topped with a PT ledger and TJI's rest on that. The steel is boxed in with plybead on the porch side (to match the porch ceiling) and stucco on the more exposed side. My question is about what to do to cover the bottom side of the beam. I doubt I should just box it in be/c then there is no air flow. One idea is to use the perforated vinyl soffit material. How much of the perforated alternated with how much of the non-perforated is recommended to get sufficient air? Another idea is to use plybead and then cut in vents here and there. How many vents in a 63' length of beam?
Asked another way, how much venting is sufficient to avoid trapping moist air in a boxed-in steel beam?
Thanks,
Jim