Why Do Roofs Need Ventilation

These specialty vents do not affect the.

Why do roofs need ventilation.

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. Hot roofs need to be ventilated and cold roofs don t but why. Good quality roofing is a vital aspect to any house. Two gable vents may not be sufficient.

Take a look at the reasons behind roof ventilation the different types and if you need it. Roofs generally have a number of venting devices including ridge vents soffit vents fans and mechanical types of airflow assistance. Cold roofs have insulation beneath the roof deck which is beneath the roofing material. 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.

I have roof vents so i have roof 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. After all aren t those vents letting your warm conditioned air escape. Why is there a need for roof ventilation.

A balanced attic ventilation system that consists of intake at the eaves soffits or fascias of the roof and exhaust at or near your roof ridge serves two important functions. The majority of roofing experts agree that ridge vents are the most effective and cost effective roof vents available. Gable vents require soffit vents that encourage air circulation. Gable vents are not roof vents at all but serve the same function without the need of cutting into the metal roofing.

Why do some flat roofs need to be vented. Take for example ridge vents. The area of soffit and roof vents is typically measured in square inches. First it allows cool fresh air to enter into the attic.

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. 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. While hardly anybody agrees on the best roof ventilation system everybody agrees some roof vents do hardly any good at all. Do you really need roof ventilation.

Use the factor 1 square foot 144 square inches to convert. The need for roof ventilation wasn t documented until the early to mid 20th century. Second it allows hot moist air to escape.