Go Back   InterNACHI Inspection Forum > >

Notices

Roofing Inspections Contains discussions about inspecting roofs.

Reply
 
Thread Tools
  #1  
Old 12/19/18, 10:49 PM
Stephen D. Whittington's Avatar
Stephen D. Whittington Stephen D. Whittington is online now
Certified Professional Inspector (CPI) ®
 
Join Date: Apr 2017
Location: Lakeland, FL
Posts: 77
Default White Stains on roof

This one is in Florida. I see this quite a bit, where I see white staining (or is it a lack of dirt/fungal growth?) on older asphalt roof coverings, immediately under all penetrations. Can anyone tell me what it is from, and if it tells us anything about the roof condition I should be reporting? Thanks in advance for your expertise!
Attached Thumbnails
White Stains on roof-20181218_145458_hdr-jpg  
Reply With Quote
Need a home inspection in Missouri? Check out InterNACHI's listing of Missouri certified home inspectors. Or, find a home inspector anywhere in the world with our inspection search engine.
  #2  
Old 12/20/18, 6:55 AM
Roy Lewis, CMI's Avatar
Roy Lewis, CMI Roy Lewis, CMI is online now
Certified Master Inspector ®
 
Join Date: Nov 2012
Location: North Florida
Posts: 13,658
Default Re: White Stains on roof

Zinc from the lead boots.




InterNACHI Lifetime Member.
www.1stproinspection.com
roy@1stproinspection.com
Serving Gainesville Florida and surrounding areas.
Florida Certified Contractor #CRC1328001
Florida Certified Home Inspector #HI7019
Deus solus me iudicare potest
#1st Pro Inspection
Well! They may have degrees, but that is not an indicator of common sense or right thinking...M. Larson circa 9-27-2018.
Reply With Quote
  #3  
Old 12/20/18, 6:57 AM
Stephen D. Whittington's Avatar
Stephen D. Whittington Stephen D. Whittington is online now
Certified Professional Inspector (CPI) ®
 
Join Date: Apr 2017
Location: Lakeland, FL
Posts: 77
Default Re: White Stains on roof

Well, that was easy! Thanks much
Reply With Quote
  #4  
Old 12/20/18, 8:52 AM
Randy Mayo, P.E.'s Avatar
Randy Mayo, P.E. Randy Mayo, P.E. is online now
Certified Professional Inspector (CPI) ®
 
Join Date: May 2006
Location: Rolla, MO
Posts: 1,529
Default Re: White Stains on roof

Actually, the roof has black algae (Gloeocapsa magma) on it and rain washes the zinc down killing the algae. So the light-colored stain is actually the original shingle color. Copper will also kill the algae. You can actually buy shingles now with copper mixed in with the granules to prevent the algae.




Randy Mayo, P.E.
573-201-8162
www.rlmengineers.com
Reply With Quote
  #5  
Old 12/20/18, 9:52 AM
Chuck Evans's Avatar
Chuck Evans Chuck Evans is online now
Certified Master Inspector ®
 
Join Date: Sep 2006
Location: Stagecoach, TX
Posts: 10,912
Default Re: White Stains on roof

It's the rest of the roof that's stained. Those jacks are improperly installed by the way. The flanges should be interleaved with the shingles.



Chuck Evans (TREC #7657)
Level III Infraspection Institute Certified Infrared Thermographer (#8402)
HomeCert Houston Home Inspections & Thermal Inspections Find us on Facebook
The Woodlands Home Inspections
Magnolia TX Home Inspections & Thermography


Houston, TX
_______________________
Awards Committee Member

SUBMIT YOUR AWARD NOMINATIONS HERE

The InterNACHI Awards Committee is the final authority of issuance of any award the committee offers.
Reply With Quote
  #6  
Old 12/20/18, 12:13 PM
Don C. Hawley's Avatar
Don C. Hawley Don C. Hawley is offline
Certified Professional Inspector (CPI)
 
Join Date: Feb 2016
Location: Pocahontas, IL
Posts: 303
Default Re: White Stains on roof

FYI, for retrofit on existing roofs there are a number of products from zinc strips to spray on algae killers.

Don Hawley CPI
Hawley Home Inspections LLC

Home Inspection Services, Termite, Radon & Sewer Scope
DonHawley575@gmail.com
Licensed Radon Professional
Licensed Home Inspector
Reply With Quote
  #7  
Old 12/21/18, 6:28 AM
Stephen D. Whittington's Avatar
Stephen D. Whittington Stephen D. Whittington is online now
Certified Professional Inspector (CPI) ®
 
Join Date: Apr 2017
Location: Lakeland, FL
Posts: 77
Default Re: White Stains on roof

Quote:
Originally Posted by cevans View Post
It's the rest of the roof that's stained. Those jacks are improperly installed by the way. The flanges should be interleaved with the shingles.
Thanks much. What do you mean by the "jacks?" The bottom flange of the lead boots? I see them both interlaced with shingles, and not in the photo I believe.
Reply With Quote
  #8  
Old 12/21/18, 6:37 AM
Stephen D. Whittington's Avatar
Stephen D. Whittington Stephen D. Whittington is online now
Certified Professional Inspector (CPI) ®
 
Join Date: Apr 2017
Location: Lakeland, FL
Posts: 77
Default Re: White Stains on roof

Ah nevermind, I'm just not used to them being called jacks in these parts. I got it now, lol. Too early!
Reply With Quote
  #9  
Old 12/21/18, 7:17 PM
Bradley K. Toye, CMI's Avatar
Bradley K. Toye, CMI Bradley K. Toye, CMI is online now
Certified Master Inspector
 
Join Date: Sep 2010
Location: Clearwater, FL
Posts: 5,438
Default Re: White Stains on roof

Quote:
Originally Posted by swhittington View Post
Ah nevermind, I'm just not used to them being called jacks in these parts. I got it now, lol. Too early!
Yep, we call them vent boots in these parts. I hope you read up on black algae and AR shingles vs non-AR shingles.



Brad K Toye
ITC/FLIR Level I Building Investigation Thermographer
FL Certified Building Contractor CBC034303
FL Certified Home Inspector HI 391
FL Certified Mold Assessor MRSA 589

727-403-5029
Lecsi2@gmail.com
Reply With Quote
  #10  
Old 12/27/18, 4:35 PM
Stephen D. Whittington's Avatar
Stephen D. Whittington Stephen D. Whittington is online now
Certified Professional Inspector (CPI) ®
 
Join Date: Apr 2017
Location: Lakeland, FL
Posts: 77
Thumbs up Re: White Stains on roof

Quote:
Originally Posted by kshepard View Post
The lower flange should terminate on top of the shingle in the course below. One is correct, the others are wrong.
Thanks Kenton. Yes, that's what I like to see also with that flange hanging out. I see them fully buried under the shingles all the time unfortunately!
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 8:39 PM.
no new posts