Foam Insulation Baffles Ceiling
Bob Vila explains that attics have intake vents under the roof's eaves that let in cool air as well as hot air exhaust vents at the peak of the roof that let out hot air. The intake vents are usually installed in the soffit as one continuous perforated piece or as individual vents spaced out every few feet. With gable roofs, the vents might be on the side of the house, close to the peak of the gable.
The intake vents can block, which will reduce the flow of fresh air to your attic. This can lead to heat buildup, and even moisture build-up during winter. Although it might seem counterintuitive to say, heat should not build up in your attic in winter. Hot attics can cause ice dams, which can be very dangerous.
Some baffles can be used for insulation only and may not take into consideration that the baffles often fall out. Loose-fill insulation should be used for insulation. It fills all spaces to maximize its potential, reduce moisture and improve air circulation (air circulation). If you install insulation without baffles, your rafters space could be too large or too small. Installing baffles will ensure your crawlspace and attic are fully filled.