Replies

1. 
   Sphere | Jul 22, 2005 06:58pm | #1

   More likely ALGAE..you do nat say what KIND of roof it is.

   1 cup of chlorox and a half cup of TSP in a gallon of warm water..applied with a pump type sprayer...lit it sit a while, do not prewet ( causes dilution)..avoid scrubbing vigorously.

   Rinse and be happy. Maybe a zinc treatment near the ridge is called for....

   But hell, what do I know.

     Spheramid Enterprises Architectural Woodworks

1. 
   ditzzygirl | Jul 22, 2005 07:07pm | #2

   the shingles are the fancy looking ones...I think they are called archies or something like that. roof is about 8 yrs old

   If there are no trees within several hundred ft, wouldn't it be mold instead of algy?

1. 
   Sphere | Jul 22, 2005 07:10pm | #3

   maybe fungus is more appropo.

   Some manufacturers have a fungicide in the process, to avoid just what you are seeing.

   I guess they ain't what you have tho'.  Spheramid Enterprises Architectural Woodworks

1. 
   ditzzygirl | Jul 22, 2005 07:32pm | #4

   how can I tell what it is? I thought it was mold(was told this) and agreed since it's on the north side. almost looks like bird turd but lots of it

1. 
   Sphere | Jul 22, 2005 07:44pm | #5

   It doesn't matter WHAT it is, the treatment is basically the same.  Spheramid Enterprises Architectural Woodworks

2. 
   ditzzygirl | Jul 22, 2005 08:08pm | #6

   Thank you for your help/tips, we'll give it a try hopefully this weekend

    

   side note--are you still in pain? visit the ER yet? those battle scars looked nasty and painfull

3. 
   Sphere | Jul 22, 2005 08:13pm | #7

   Thanks for asking.

   I am holding it together well enuff without a hospital visit.

   The pain? well, yes..almost incredible.

   I just love all the colors that are appearing now..greens and blues and black..LOL  Spheramid Enterprises Architectural Woodworks

4. 
   MikeSmith | Jul 23, 2005 12:49am | #8

   ditzzy.... if you nail some copper strips at the ridge... the copper will leach out every time it rains and keep the algae under control..

    copper granules are what the mfr's are putting in their shingles now for that very purpose..

    works even better than zincMike Smith Rhode Island : Design / Build / Repair / Restore

5. 
   rjw | Jul 23, 2005 03:01am | #9

   As noted, probably lichen or moss.I use vegetation killer on mine; works better than bleach and H20.I haven't tried bleach and TSP; (I try to avoid mixing stroing chemicals.)Copper or zinc strips can work, but sometimes they don't work all of ther way down the roof surface Attached is a pic showing how copper can control lichen, from copper flashing on a chimney.

   View Image

   Sojourners: Christians for Justice and Peace

   
6. 
   MikeSmith | Jul 23, 2005 04:00am | #10

   pretty dramatic difference in the drip zone

   View ImageMike Smith Rhode Island : Design / Build / Repair / Restore

7. 
   ditzzygirl | Jul 23, 2005 03:36pm | #13

   vegetation killer... might just try that since I couldn't find any TSP yesterday. any specific brand? won't it stain the roof?

   thank you for the photo, the copper really does make a difference

8. 
   DonCanDo | Jul 23, 2005 06:01pm | #15

   vegetation killer... might just try that since I couldn't find any TSP yesterday. any specific brand? won't it stain the roof?

   I tried Round-Up.  It killed the moss, but it had no effect on the brown streaks which I assume is the result of mold.  The mold is probably already dead and I'm just seeing the resulting stain.  You can't kill what's already dead.  But it did not stain the roof any further.

   BTW, the moss returned pretty quickly and I'm not going up on my roof to re-apply Round-Up every week or 2.

   -Don

9. 
   ditzzygirl | Jul 23, 2005 03:28pm | #11

   ...nail some coppper strips at the ridge...

   where would I put the nails? and not cause any leaks?

   I like the idea of copper if it works, but I'm not sure how big of pieces or how many to use

10. 
    MikeSmith | Jul 23, 2005 03:36pm | #12

    4 "  strips , 3" long, with a bend up at the bottom..

    lift the first course down from the ridge, shove them up 3" and blind nail them.. put a dab of roof cement over every nail then press the shingle back down

    this will leave 1" showing.. the rain will leach out all of the copper you needMike Smith Rhode Island : Design / Build / Repair / Restore

11. 
    ditzzygirl | Jul 23, 2005 03:41pm | #14

    thank you

2. 
   poorsh | Jul 23, 2005 10:34pm | #16

   Hi

   We live in Vancouver, British Columbia where moss and mould are a continuing problem. To kill the moss we went to a garden centre and got Later's moss killer and just sprayed it on. Most moss killers contain ferrous sulphate as the active ingredient which is also used on lawns so is relatively safe. We used zinc strip just under the ridge cap which controlled it well for about 8 years. Guess it stopped leaching. Will have to put up a new strip.

   I wouldn't scrub or high pressure wash your shingles as it will just reduce their life.

   Cheers

   Mac