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Old 11-23-2008, 08:38 PM   #16
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Dishonest roofing companies, or corporate propoganda?


Get at least five bids and plot them on a line. Hopefully they cluster around the true price for your job in Nov. '08 in your zip code. In this example the true cost is 3000 gold pieces.

....x.....x.x..x......x
|.....|.....|.....|.....|
0 2000 3000 4000 5000

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Old 11-25-2008, 03:48 AM   #17
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Dishonest roofing companies, or corporate propoganda?


Yes you have the perfect roof for a ridge vent. Make sure he only installs the one ed said above. Meaning not all ridge vents are good. But the one ed said is the best. That roof is in tough shape in spots so plan on sheathing being replaced in some spots. Go with the certainteed landmark 30 ar you will be in good shape. You can save a few bucks going with osb or 1/2 cdx for sheathing. Get rid of those vents on that roof. There in tough shape. Kind of like the ones i was talking about but not. The new ones come up higher then those and have slits on the side and back. But your roof is perfect for ridgevent. Finally paint those plumbing vents to match roof. Roofer should provide that no problem They make spray paint to match shingle.

Last edited by 747; 11-25-2008 at 03:53 AM.
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Old 11-25-2008, 12:48 PM   #18
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Dishonest roofing companies, or corporate propoganda?


One more thing that I just noticed.

Not all of your existing slant back mushroom style static vents are attic vents.

the ones on the right side of the picture, placed closer to the center of the roof and near the plumbing vent pipes are more than likely being used as the exhaust portals for the bathroom and/or kitchen exhaust fans.

Those are the wrong type, as they still allow the internally built up humidity an egress point into the attic chamber, providing a build up of additional condensation inside, which could cause a mold issue on the underside of the deck sheathing.

Switch to a proper bathroom and/or a kitchen exhaust vent with a damper. Broan manufactures these for between $ 18.00 to $ 28.00 with the hose connecting kits.

I pick them up from Menards or my roofing supply house.

Ed
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Old 11-26-2008, 02:44 PM   #19
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Dishonest roofing companies, or corporate propoganda?


Quote:
Originally Posted by Ed the Roofer View Post
One more thing.

I absolutely dread it when a home owner states that they know they have enough Intake Ventilation.

Most Roofing Contractors, and I mean over 95 % of them, do not know what is the proper amount.

The only way to tell for sure, is to calculate the total NFVA for all vent products installed and see if they equal or slightly exceed the NFVA of the Exhaust Ventilation proposed to be installed.

Ed
Ed, I was speaking of soffit vents specifically when I mentioned ventilation in the attic. Our attic floor space is roughly 1800 square feet, and the house has roughly 200 square feet of soffit vent installed. From a strictly soffit vent stand point, that's a whole bunch of ventilation. When I say there's more than enough soffit vent, I say it based on a measurement of soffit vent versus attic space. According to what I've read, the soffit vents we have are up to the job.

I admit that some of the soffit vents were blocked by a rather insanely thick layer of blown in insulation when we first acquired the house, but I have since gone in to the attic and raked the stuff out of the soffits to improve ventilation. We haven't had warm weather since then, so I can't say how much it helped.

As for figuring how much ventilation the other existing vents are allowing, I really can't say. I don't know the figures for each of the exisiting vent fixtures. I can however, figure out what the ventilation would be with new ridgline installed since the specs are readily available for various products. As you've stated, this is the way to do it.

I think we're on the same page. Right? I'm pretty smart most of the time.
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Old 11-26-2008, 02:58 PM   #20
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Dishonest roofing companies, or corporate propoganda?


The 2000IRC addresses roof ventilation in paragraphs R806.1, .2 & .3. And, it is rocket science!
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Old 11-26-2008, 05:57 PM   #21
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Quote:
Originally Posted by KAdams4458 View Post
Ed, I was speaking of soffit vents specifically when I mentioned ventilation in the attic. Our attic floor space is roughly 1800 square feet, and the house has roughly 200 square feet of soffit vent installed. From a strictly soffit vent stand point, that's a whole bunch of ventilation. When I say there's more than enough soffit vent, I say it based on a measurement of soffit vent versus attic space. According to what I've read, the soffit vents we have are up to the job.

I admit that some of the soffit vents were blocked by a rather insanely thick layer of blown in insulation when we first acquired the house, but I have since gone in to the attic and raked the stuff out of the soffits to improve ventilation. We haven't had warm weather since then, so I can't say how much it helped.

As for figuring how much ventilation the other existing vents are allowing, I really can't say. I don't know the figures for each of the exisiting vent fixtures. I can however, figure out what the ventilation would be with new ridgline installed since the specs are readily available for various products. As you've stated, this is the way to do it.

I think we're on the same page. Right? I'm pretty smart most of the time.

You are the unique home owner who took the time and effort to do the calculations. The exception, rather than the rule.

Most mushroom vents provide either 50-51 square inches of NFVA for the exhaust ventilation, although the larger versions provide 65-85 square inches of NFVA per unit. This is predicated on the hole that is cut out is done to the exact specifications for sizing as required.

On a RV-50, (Roof Vent, 50 Square Inches), the hole must be 10" x 10" square under the vent product to provide the expected result of 50 square inches of exhaust.

100 square inches for the hole and decreased in half by the screening material that is part of most/all vent product gives you that 50 sq in figure.

If the hole is cut with a 6 3/4" to 7 1/4" circular saw blade, the typical installation manuveur would to just plunge cut all four sides the width of the saw blade cut, which would then Not be the required 10" x 10" hole.

Ed
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Old 11-26-2008, 05:58 PM   #22
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Dishonest roofing companies, or corporate propoganda?


Quote:
Originally Posted by Yoyizit View Post
The 2000IRC addresses roof ventilation in paragraphs R806.1, .2 & .3. And, it is rocket science!
If you have a link for that, could you please copy/paste it here?

Also, the verbage used would be of assistance also.

Thank You.

Ed
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Old 11-26-2008, 08:10 PM   #23
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Dishonest roofing companies, or corporate propoganda?


Quote:
Originally Posted by Ed the Roofer View Post
If you have a link for that, could you please copy/paste it here?

Also, the verbage used would be of assistance also.

Thank You.

Ed
Here's one online link
http://greensburg.buildingscience.co...oned_Attic.pdf
that seems to talk directly about what my paper copy says.

This link
http://www.berkleymich.org/web/documents/Roof-Specs.pdf
is word for word what my book says.

Glad to help. Even roofers were surprised that such a spec exists.
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Old 11-26-2008, 09:33 PM   #24
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Dishonest roofing companies, or corporate propoganda?


Quote:
Originally Posted by Yoyizit View Post
Here's one online link
http://greensburg.buildingscience.co...oned_Attic.pdf
that seems to talk directly about what my paper copy says.

This link
http://www.berkleymich.org/web/documents/Roof-Specs.pdf
is word for word what my book says.

Glad to help. Even roofers were surprised that such a spec exists.


Thanks.

I was hoping that you had a direct link to the IRC Code Book Source. They charge a lot for that book and download directly through the ICC and many other sites I tried.

Yes!!! Most Roofing Contractors have NO CLUE, when it comes to knowing how to determine the correct amount of Intake and Exhaust Ventilation required.

What really does, or actually, does not surprise me, is that Air Vent puts on FREE Seminars every winter through the spring.

2 in the Chicago area.

Several thousands upon thousands of roofers that could potentially show up to these free seminars, but the attendance is always only around 35-50 every single year.

Out of those in attendance, many are roofing supply house representatives and several are builders and architects.

The lack of a proper showing from the Roofing Contractor or Roofing Salesman area is pathetic.

Even though I have attended at least 6-8 of these seminars, I will still always show up again and again, just to see what and if someone else has to say about someting they discovered in the Q & A portion of the session.

Ed

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