Do Zinc Strips Prevent Black Algae AFTER Algae Removed? - Roofing/Siding - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Roofing/Siding

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 08-18-2008, 11:43 AM   #1
Newbie
 
Join Date: Aug 2008
Posts: 2
Rewards Points: 10
Default

Do zinc strips prevent black algae AFTER algae removed?


Grumpy, the roofing god, apple roof cleaning, Barry M, johnk, and All,
Noticed your suggestion of zinc strips AFTER black algae removed, Grumpy--have you/anyone in northern climate had positive experience with strips preventing algae re-growth AFTER algae removed?
...other posts say that zinc strips don't work/only work for 2-4 feet of roof, but these posts don't make clear whether or not the black algae was removed first.
My situation: northern climate--in E.Massachusetts, just south of NH border--black algae on N-facing 43-degree pitch on a Cape-style house...black algae streaks formed on roof cross-section directly above the "slanted" interior 2nd-floor walls, just started past 2 years after very thorough insulation done (by contractor)...i'm guessing because space between slanted interior walls and joists above the slanted walls was dense-packed with cellulose (above fiberglass batting, kraft-facing next to ceiling), without propavent, so North-side ventilation from knee-wall area (Hicks vents) blocked from flowing over the slanted walls up to the ridge vent (propavent was installed on the S side).
The insulation job increased comfort and decreased heating costs
significantly, so some algae (and a couple of pencil-erase-size green mosses just getting started) not a huge price to pay I guess, but doesn't look too hot and am concerned about possible long-term damage to roof (2 layers asphalt, 40-yr architectural 10 yrs ago over 20-yr flat, in very good condition)...so plan to wash off the algae and moss, just wondering whether or not to install zinc strips after (and if you've had good luck with zinc AFTER cleaning, would like to know which brand--Shingle Shield 3-ft pieces, Z-Stop continuous, or other?)
Many thanks, any experience-based comments appreciated!

Advertisement

unclej is offline   Reply With Quote
Old 08-18-2008, 06:29 PM   #2
Pro Slate Roofer
 
tinner666's Avatar
 
Join Date: Mar 2005
Location: Richmond, Va.
Posts: 1,611
Rewards Points: 1,038
Default

Do zinc strips prevent black algae AFTER algae removed?


Just install it if you can. It helps. I install it when I put the roof on. Mine is 6 years old and no algae. Have retro installed it by removing the cap and putting it under the cap. Roof stayed clean.

Advertisement

tinner666 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
GAF Roof... the best EdPDX Roofing/Siding 73 09-12-2011 06:53 AM
Over-trimmed shingles are driving me crazy pipeguy Roofing/Siding 12 08-17-2008 05:38 PM
Black strips on wallboard mounted on metal studs regman Building & Construction 4 07-20-2007 11:07 PM




Top of Page | View New Posts