"JD" wrote in message
...
I'm in the process of getting a new roof and the first roofer wants to
install ridge vents, which I wasn't familiar with. I've done some research
and ridge vents seem to be a good idea? I have some questions:

I have a hip roof so do the ridge vents go on every ridge or just the top
or highest ridge?

I found a web page that talks about the relationship between the amount of
ridge vent and number of soffit vents.

http://www.rd.com/familyhandyman/content/18231/0

If you scroll about half way down the page they talk about Minimum Venting
Requirements. Is the information they provide correct? It says a 1,500 sq
ft attic will need 10 sq ft of venting, half on the roof and half on the
soffits. They say the factor is 1 sq ft of venting for each 150 sq ft of
attic. Is that correct?

--
JD..

You will have to see if the roofer is willing to install the soffit vents
and factor that into the equation. I would do my own math, however. I had
about half of the required vents installed nearly 15 yrs ago and the time
has passed quickly meaning, I didn't add the difference. Now it's time for
new soffit and fascia so we'll be using perforated soffit this time. I
don't believe I can over-ventilate.