Why Do Roofs Need Ventilation

As modern construction techniques continue to place more emphasis on energy conservation minimising the heat loss from buildings insulation thicknesses have increased and air tightness is constantly improving.

Why do roofs need ventilation. That s when organizations like the american society of heating refrigerating air conditioning engineers formerly ashve and forest products laboratory recognized that building condensation problems could be caused by poor roof ventilation. Two gable vents may not be sufficient. Especially during the winter you might wonder why your roof needs vents. Good quality roofing is a vital aspect to any house.

Use the factor 1 square foot 144 square inches to convert. I have roof vents so i have roof ventilation. The area of soffit and roof vents is typically measured in square inches. Take for example ridge vents.

Rafter vents or insulation baffles install in any rafter space to create narrow gaps that direct fresh air from the soffit vents to the peak of the roof. Take a look at the reasons behind roof ventilation the different types and if you need it. If your attic floor has an area of 1 500 square feet for example you need 10 square feet of ventilation space unless your house has a vapor retarding liner in which case you need 5 square feet. Gable vents require soffit vents that encourage air circulation.

Do you really need roof ventilation. Not only does it protect the house itself but if it is well constructed and well put up then it will protect everything within the house too. Cold roofs have insulation beneath the roof deck which is beneath the roofing material. Roof problems caused by poor ventilation roofs that do not have sufficient ventilation can have a problem with condensation in which heat warms the moist surfaces under the roof causing them to leak and stain interior ceilings.

Hot roofs need to be ventilated and cold roofs don t but why. Second it allows hot moist air to escape. First it allows cool fresh air to enter into the attic. While hardly anybody agrees on the best roof ventilation system everybody agrees some roof vents do hardly any good at all.

Why do some flat roofs need to be vented. The need for roof ventilation wasn t documented until the early to mid 20th century. After all aren t those vents letting your warm conditioned air escape. The majority of roofing experts agree that ridge vents are the most effective and cost effective roof vents available.

Why is there a need for roof ventilation. Roofs generally have a number of venting devices including ridge vents soffit vents fans and mechanical types of airflow assistance. If the roof has numerous gables gable venting may suffice.