Commercial Roof Ventilation in Metairie, LA

Usually not, because there is nothing to ventilate. A conventional low slope commercial roof is a compact assembly of deck, vapour retarder, insulation and membrane with no cavity in it by design. The attic ventilation rules everyone quotes describe a ventilated cavity between a ceiling and a sloping roof, and a flat roof does not have one. If yours is wet, that is a diagnosis question rather than a ventilation one.

Rarely, and in this climate it can make things worse. Metairie sits in a hot humid zone, so outside air is the humid air for most of the year. Opening a sealed assembly to it tends to admit moisture rather than release it, and the small breather and edge vents sold for this move very little air anyway. Find out whether the water is entering, condensing or original to the build first.

Estimated ranges. A rooftop gravity or turbine ventilator installed on a pitched or metal building runs $300 to $900 per unit including curb and flashing. A powered roof exhaust fan on a warehouse or production building runs $1,500 to $5,000 per unit installed, with the electrical connection priced separately as a different trade.

Only if the building actually has an attic or a ventilated roof cavity, which plenty of pitched and older commercial buildings in Metairie do. It does not apply to a low slope membrane roof, because that assembly has no cavity for the ratio to describe. For attic work on a house the rule and the sizing argument belong with our residential Metairie roof ventilation page.

Sometimes, and sometimes it is a mechanical one. If the building runs negative pressure because its exhaust removes more air than its make up air replaces, it pulls humid outside air in through every opening including the roof assembly, and no roof work fixes that. We check for it and tell you when the answer is a mechanical contractor rather than us.

Do not assume you do not. The parish publishes a roofing exemption for one and two family dwellings only and there is no commercial equivalent. Its minor ordinary repairs clause is discretionary and requires the Building Permits Department's approval case by case, and cutting new curbed penetrations into a commercial roof is not the kind of work to assume into it. We confirm the scope before starting.

They can, because each unit is a new penetration through a working roof. On a membrane still inside its warranty the curb and flashing detail has to follow the manufacturer's published detail, in their material, and often has to be done by an approved contractor. We quote the compliant method and say plainly where a warranty has already expired.

A gravity ventilator has no moving parts and relies on buoyancy and wind. A turbine adds a spinning cowl that draws more air but has a bearing that eventually fails. A powered fan moves a specified volume regardless of conditions and is the right answer for a warehouse or a production building, provided make up air is planned alongside it rather than left to chance.

Most rooftop units are installed inside a day each once materials are on site, and a typical scope of one to three units runs one to three days. A moisture investigation on a low slope roof takes longer because infrared needs a sunny day followed by a clear dry evening, so it is scheduled around the weather.

Yes. Big Easy Roofing works on commercial buildings across Metairie, including the Veterans Boulevard and Airline Drive corridors and the warehouse and light industrial stock toward the parish line, with coverage extending to Kenner, Harahan, River Ridge, Gretna and the rest of Jefferson Parish.