Block off gable vents from attic side of home

[Willie]

I just had a new roof installed.

I had them remove three roof vents because they installed a ridge vent.

A neighbor told me I should block off the gable vents.

What do you think?

[home improvement guy]

Most roofers will install a ridge vent with every new shingle application unless you tell them not to.

The manufacturer's instructions state you should only install a ridge vent in combination with soffit venting. Having roof vents, turbines, power vent fans or gable vents interferes with the function of the soffit-to-ridge venting system.

According to Cor-A-Vent's website (cor-a-vent.com): "The ridge vent should not be used with other roof mounted or gable end vents. They can disrupt the air flow through the attic. A properly setup ridge/soffit vent system does not need to have power roof vents to help move hot air out of the attic. Whole house fans work great with a ridge/soffit vent system. We do not consider them the same thing as the power roof vents."

What I tell my clients during a home inspection is to block off the gable vents from the attic side of the home.