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Old 07-03-2012, 08:03 PM   #1
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Another Venting Question


Hi Guys, I have been lurking on this website for a while and its been very helpful. I am getting ready to re-roof my house. I am going from shake roof to asphalt shingles (Certainteed Presidential). I have been reading up on codes and trying to get all the research done ahead of time so I don't have to many suprises once I start the job in september.

My first question is regarding Title 24 compliance. I want to make sure I am meeting the requirements (California Resident). Here is what I have calculated. Can someone confirm this is correct? If not point me in the right direction?
45ftx50ft=2250ft2
2250 ft2 of Attic /150= 15 ft2
15ft2 * 144/2= 1080 sq in

Soffit vents are 40 NFA

1080sq in/40sq in= 27 Soffit Vents Needed

Ridge Vent

1080sq in /17 in per lin ft=63.5ft of Ridge Vent needed

So if I am correct it is saying I need 27 soffit vents and 64 ft of ridge vent to meet compliance?

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Old 07-04-2012, 06:24 PM   #2
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Another Venting Question


Bump? Anyone?

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Old 07-04-2012, 07:30 PM   #3
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Another Venting Question


You seem to understand and have correct the formula e for the T-24 requirements. It seems like your ridge vent calc is low though.

Now, usually for a re-roof you don not need to bring the venting up to code although this particular code has been around for a long time.

I usually only have to spec the venting if there is going to be new roof area.

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Old 07-12-2012, 03:17 PM   #4
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Another Venting Question


Andy thanks for your input, I do have a question. You said:

"Now, usually for a re-roof you don not need to bring the venting up to code although this particular code has been around for a long time."

So does that mean I do not need to bring it up to code? From my reading I thought this law went into affect in 2010 including re-roofs. Can you give me more details?


As it is right now I have 9 soffit vents. If I was to put 27 in then I would have essentially no bird blocks in between the trusses. When I watch all the roofing companies around here reroof I dont see them putting in all these soffit vents. I just want to make sure its done right and I pass inspection.

Thank you

Last edited by rpratt84; 07-12-2012 at 03:19 PM.
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