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Old 09-02-2016, 02:21 PM   #1
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Please help> brand new roof shingle and plywood moldy attic after 1 winter


Hello

I got brand new GAF roof with cobra roll off ridge vent back in April 2015 .
I went up in the attic March 2016 found white mold.later I found out the roofer did not cut any soffit/eaves vent .so they come out cut 50 holes 4" diameter 25 in each side.he also told me to spray with mold killer.here is some pic.

Now sept still moldy....

Please help.....TIA

Also found first rot and cracked in rafters now
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Please help> brand new roof shingle and plywood moldy attic after 1 winter-20160831_164348_1472844021469.jpg  

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Old 09-02-2016, 02:22 PM   #2
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1/3" gap for ridge vent 6 ft long
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Old 09-02-2016, 02:26 PM   #3
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More pic
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Please help> brand new roof shingle and plywood moldy attic after 1 winter-20160531_154651_1472844212248.jpg   Please help> brand new roof shingle and plywood moldy attic after 1 winter-20160525_211033_1472844261403.jpg   Please help> brand new roof shingle and plywood moldy attic after 1 winter-20160525_210908_1472844286248.jpg   Please help> brand new roof shingle and plywood moldy attic after 1 winter-20160525_210740_1472844312913.jpg   Please help> brand new roof shingle and plywood moldy attic after 1 winter-20160525_211412_1472844377077.jpg  

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Old 09-02-2016, 02:31 PM   #4
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


i know is ventilation issue for sure,he alredady cut soffit vents. any input what else can go wrong? THANK YOU
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Old 09-02-2016, 03:09 PM   #5
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


The gap for the ridge vent is insufficent. GAF wants a total of a 2" opening. If there is no center board as in trusses that is just as it reads. If there is a center board of some sort they want 1" on each side of that board to get the 2 inch total. If the opening isn't big enough the vent will not meet its specs for air flow.

edit: you could get by with 3/4" on each side of the centerboard for a total of 1.5 inches and that would be enough. But a 1/3 of an inch ain't even close.
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Old 09-02-2016, 03:17 PM   #6
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


thank you for response, yes there is center beam 1".how u think about GAF roll off mesh vent compared to baffled ridge vent? i see a lots bad reviews about mesh vent
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Old 09-02-2016, 03:35 PM   #7
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


Any roof I've seen with that roll venting has that same issue, most of my local roofing supply's stopped selling it because of the issues.
Only thing I install is the baffled vents and never once had an issue.
What do you have for soffit venting, not enough or there blocked with insulation and no roof venting is going to work.
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Old 09-02-2016, 03:41 PM   #8
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


the roofer is a joke,he only there 1 hour during installation process and let the subcontractor do their thing the rest of the day.so they did not do soffit vent and other stuff.no one check their work

when i told him about the mold he quickly blame others solar panel this and that. finally thanks to google i found out abt soffit vent t
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Old 09-02-2016, 03:46 PM   #9
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


Quote:
Originally Posted by adlaury View Post
the roofer is a joke,he only there 1 hour during installation process and let the subcontractor do their thing the rest of the day.so they did not do soffit vent and other stuff.no one check their work

when i told him about the mold he quickly blame others solar panel this and that. finally thanks to google i found out abt soffit vent they didnt do.
i will try to have him replace roll off ridge and should i have him pay for mold remediation and insulation also?
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Old 09-02-2016, 09:04 PM   #10
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


Do you have a problem with excess moisture in your attic to start with? In other words, are your exhaust fans for the bath rooms vented to the outside, not just venting into the attic space?
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Old 09-03-2016, 05:50 AM   #11
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No bath fans,with old roof we don't hv issue with moisture no soffit 4 vent box and baffled ridge 1250sq ft no air sealed.

Now we have hv this new roof problem a rise.i just installed 2x bath fan properly vent outside.i may hv to do air seal and add insulation in October
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Old 09-03-2016, 06:56 AM   #12
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


Cobra vent is a terrible product as @joecaption stated. Most good supply stores will caution you from buying it. That fact, combined with the lack of proper opening as @craig11152 pointed out is your issue.

Now, without knowing soffit venting, those are your venting issues.

As @firehawkmph mentioned, moisture is the real culprit. Air seal and insulate in conjunction with getting those moisture sources outside and that will solve your issues.

Sorry for the terrible result, but that ridge vent material is really bad stuff and poorly done here.
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Old 09-03-2016, 07:40 AM   #13
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Is it OK to have soffit cut if there is bath vent 15ft below (1st level bath )? Looks like mold is back after i clean it in may,I hv bi level house

Or should I cover that soffit?maybe I should wait until they replace the mesh ridge

Is 50-60 4" soffit vent is enough for 1250 sq ft attic?

Sorry asking many question, is our first house and 1st re roof


Thanks for you input

Last edited by adlaury; 09-03-2016 at 07:59 AM.
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Old 09-03-2016, 10:24 AM   #14
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Re: Please help> brand new roof shingle and plywood moldy attic after 1 winter


A 6' long ridge vent? Doesn't sound like enough for 1,250 ft²


Although "50" sounds like a lot of soffit vents, some pop-in round vents have only 19% net free area. Here is a link that shows a 4" vent providing only 2.43 in² of vent area. Times 50 and divide by 144 and you have about 0.84 ft² of low vent area.
http://wrs.us.com/product-info/Owens...%20Catalog.pdf

Combine that with the limited ridge opening and it looks like you are short on total ventilation.

Also, make sure they did not cover the ridge opening with underlayment and forget to cut it back.

Tell us more about the space you are venting and we can provide more guidance.

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Old 09-03-2016, 10:42 AM   #15
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Ridge vent is all along the roof maybe 50 ft, there is 6ft they only cut 1/3" gap for ridge vent. Soffit vent they cuts 50-60 this year's on the eaves

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