![]() You never want the air to hit a "dead-end". Just cut a small hole/slit t allow the air to continue to the top. Here is a picture how to vent the hips where the rafters terminate on the hip rafter. Typically the AIR below the foil inside the attic will be less than 10 degrees hotter than the outside (ambient) temperature. Kinda like parking a car in the shade, it does not really help to crack the windows. Finally, one thing to remember is that once you install a radiant barrier, whatever ventilation you have is usually enough. The air will seek a way out even if it's a little below. Hot air will rise to the top of the attic and "pool". You want to leave the gap at the top even if you DON"T have ridge vents. Basically, if their is a hole in the roof, you want a corresponding hole in the foil. you will cut a hole in the foil directly below the hole. AND, if there are any other vents: wind turbines, static vents, electric fans etc. You will leave gaps at the tops and bottoms of each rafter bay. You want air to flow freely through the attic - really as though the foil is not even there. One has ridge vent and one has static (or can vents as you call them). You are actually seeing two different attics. Here is recent video we did explaining the Winter benefit: How Radiant Barrier Helps In Cold Or Mixed Climates From what we have seen the benefit from reducing heat loss is equal or greater than the heat gain from the sun in the winter. The fresh air flows up between rafters to the ridge, where a ridge. Or, air movement from cold, dense air falling through the insulation which reduces it's R-Value. A well-ventilated attic has under eave or soffit vents, which allow fresh air into the attic. ![]() Installing a radiant barrier on top of your insulation will reduce heat loss in the Winter AND reduce what is called "convective looping" in the insulation. This cold air "sucks" the heat out and although the shingles may get pretty warm, not much heat actually transfers via radiation into the insulation in the winter. Third, a ventilated roof is designed to move cold air below the roof deck to keep it cold to minimize ice damming. Second, the sun is low in the Southern sky so the actual amount of radiant heat gain is much less than in the Summer. First, the days are short, so you don't get as much sun time. ![]() Baffles prevent vents from getting clogged by insulation and ensure a clear channel for outside air to move into the attic through soffit vents. Multiply those two numbers and then divide by 150 to get. Measure the length and width of the house in feet. Baffles ensure proper airflow into your attic space. Take Your Measurements Calculate how many rafter vents you need. Baffles are installed in the attic (or should be), wherever there is an intake vent (soffit vent). Sun exposure will help some to reduce the heat loss. Baffles and rafter vents are the same things. So in the winter, heat is leaving the home. ![]()
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