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Date: Jun 22, 2010
Alittle HELPPPPPPP!!!
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I had a customer ask me today " Why does the Algae grow from the bottom of the roof up !!!" What I told him was that I didn't have a scientific reason to why it grows that way but I believe it's because the bottom of the roof line hold the moisture longer because the water flows down towards the eves...... Can someone shed some light on this for me.............

roof cleaning

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Jeff Eirich CEO
32015 128th LN NW
Princeton MN, 55371
Phone# 763-631-4277
Fax# 763-631-4278
E-mail jeff@legacy-contracting.com
web site. www.legacy-contracting.com


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Date: Jun 22, 2010
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According to the web:

Specifics: What's Growing On Your Roof?

Addressing The "Growing" Problems On Roofs Caused By Algae, Lichen, Fungus, and Moss

Fact:

Algae, or Gloeocapsa Magma, can spread... from one infested roof to another via the release of airborne spores. As more homes are built closer together, this hardy algae has been able to spread rapidly.

Fact:

Algae is well adapted to extreme conditions... heat, long dry spells, UV rays, heavy rain, intense cold, thick snow or high winds doesn't deter it.

Fact:

The dark color of Algae is a pigmented protective sheath... that encapsulates each cell to protect it from UV rays

Fact:

Copper and Zinc can both inhibit algae growth... Zinc (including pellets) however does have other inherent problems, such as: it's limited ability to be color matched to roofing shingles, attachment method to roofing shingles, cost and the occasional "bloom" effect due to the build-up of zinc oxide. Copper granules are used instead of zinc for these reasons.

Fact:

Copper is 10 times more effective against algae than Zinc... Zinc actually becomes less effective against algae quicker than copper

Fact:

AR shingles at work.some granules covering the shingle contain Copper encapsulated by a specially developed coating allowing Copper (cupric ions) to be time-released to prevent algae over a long period

Fact:

Dew is the dominant source of water for algae and is the "agent" best suited for the release of the copper in Algae Resistant shingles. Rainwater, although effective, runs off a roof too quickly to provide significant leaching of copper. Dew is also present more days than rain.

Fact:

Algae can go for long periods of time without water... It is unaffected by heat or downpours and is dormant in winter. Algae secretes a material that adheres them firmly to the shingle surface. Algae predominantly grows from the bottom - up, due in part to the amount of time water is on the roof.

Myth:

Algae is killed immediately by copper. FACT: Algae cells are poisoned over time.

Myth:

Algae is a fungus. FACT: Algae, or Gloeocapsa Magma belongs to the Cyanobacteria branch in the Eubacteria family and is not a fungus.

Myth:

Installing a copper ridge or hip shingle with copper granules on an existing roof may overcome an existing colony of algae. FACT: AR granules have not been proven to kill existing algae.

Myth:

Are "FR" or Fungus Resistant shingles better?: FACT: "FR" is an inaccurate name since fungus is not the actual source of the suggested problem. Additionally, copper granules have not been proven to inhibit fungus growth.



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Matthew C Perry
General Manager
Callahan Pro Wash
Professional Exterior Cleaning Services
Roof Cleaning, Pressure Washing, Paver Cleaning and Restoration
813-727-5161
callahanprowash.gmail.com



Guest

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Date: Jun 22, 2010
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You are right. The dampness in the morning doesn't evaporate on the north side as fast. This gives the algie a foot hold. The damper the area the faster it growes. Most gutters do not drain properly, so the water in the gutter only adds to the moisture that is needed.

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Ohio Valley Roof Cleaning
Roof Cleaning Wheeling WV 26003
 Weirton West Virginia Roof Cleaning
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 Steubinville Ohio Roof Cleaning



Guest

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Posts: 64
Date: Jun 22, 2010
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I owe it all to the fine folks from the RCIA.

__________________
Jeff Eirich CEO
32015 128th LN NW
Princeton MN, 55371
Phone# 763-631-4277
Fax# 763-631-4278
E-mail jeff@legacy-contracting.com
web site. www.legacy-contracting.com


Premium Member Roof Cleaning Institute of America Certified Roof Cleaning Specialist

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Posts: 1400
Date: Jun 23, 2010
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Legacy1 wrote:
I believe it's because the bottom of the roof line hold the moisture longer because the water flows down towards the eves......
Bingo, you knew more than you thought you did.

 



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guest

Status: Offline
Posts: 2083
Date: Jun 23, 2010
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Matthew wrote:

According to the web:

Specifics: What's Growing On Your Roof?

Addressing The "Growing" Problems On Roofs Caused By Algae, Lichen, Fungus, and Moss

Fact:

Algae, or Gloeocapsa Magma, can spread... from one infested roof to another via the release of airborne spores. As more homes are built closer together, this hardy algae has been able to spread rapidly.

Fact:

Algae is well adapted to extreme conditions... heat, long dry spells, UV rays, heavy rain, intense cold, thick snow or high winds doesn't deter it.

Fact:

The dark color of Algae is a pigmented protective sheath... that encapsulates each cell to protect it from UV rays

Fact:

Copper and Zinc can both inhibit algae growth... Zinc (including pellets) however does have other inherent problems, such as: it's limited ability to be color matched to roofing shingles, attachment method to roofing shingles, cost and the occasional "bloom" effect due to the build-up of zinc oxide. Copper granules are used instead of zinc for these reasons.

Fact:

Copper is 10 times more effective against algae than Zinc... Zinc actually becomes less effective against algae quicker than copper

Fact:

AR shingles at work.some granules covering the shingle contain Copper encapsulated by a specially developed coating allowing Copper (cupric ions) to be time-released to prevent algae over a long period

Fact:

Dew is the dominant source of water for algae and is the "agent" best suited for the release of the copper in Algae Resistant shingles. Rainwater, although effective, runs off a roof too quickly to provide significant leaching of copper. Dew is also present more days than rain.

Fact:

Algae can go for long periods of time without water... It is unaffected by heat or downpours and is dormant in winter. Algae secretes a material that adheres them firmly to the shingle surface. Algae predominantly grows from the bottom - up, due in part to the amount of time water is on the roof.

Myth:

Algae is killed immediately by copper. FACT: Algae cells are poisoned over time.

Myth:

Algae is a fungus. FACT: Algae, or Gloeocapsa Magma belongs to the Cyanobacteria branch in the Eubacteria family and is not a fungus.

Myth:

Installing a copper ridge or hip shingle with copper granules on an existing roof may overcome an existing colony of algae. FACT: AR granules have not been proven to kill existing algae.

Myth:

Are "FR" or Fungus Resistant shingles better?: FACT: "FR" is an inaccurate name since fungus is not the actual source of the suggested problem. Additionally, copper granules have not been proven to inhibit fungus growth.



If you are going to use this, you really should use a citation, otherwise it is plagourism, and no 'from the web' does not count as a citation.  This could hurt you and the forum. 

This information was cited from a GAF bulletin

 



__________________

Bill Booz

Accuwash LLC

Cell-240-425-2845

 



Guest

Status: Offline
Posts: 509
Date: Jun 23, 2010
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Yes, Bill is correct.

Sorry about that.

__________________



Matthew C Perry
General Manager
Callahan Pro Wash
Professional Exterior Cleaning Services
Roof Cleaning, Pressure Washing, Paver Cleaning and Restoration
813-727-5161
callahanprowash.gmail.com



Guest

Status: Offline
Posts: 645
Date: Jun 24, 2010
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The north side also gets less sun year round, as the days get longer so does the exposure of the north side to the sun. So in areas where trees loose thier leaves during fall your roof gets more sun during the winter, but areas where there are say pine trees you are in trouble.

Also all inside the attic heat rises. This explains how morning dew dries faster higher, and the fact that the eaves have enclosed space versus the open air of the main attic. When space is condensed there is less room for ventilation, ergo condensation which cools.

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267-477-1107
Free Your Pennsylvania Roof From Fungus
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Chalfont, PA 18914


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