Moss on roof

gravy boat · 03-31-2009, 09:32 PM

Since I replaced my old shingled roof with a metal roof I haven't seen a lick of moss.

Snow, however, tends to build up as it slides off. And we won't soon forget how, last year, a particularly large build up of snow and ice blew out part of our deck railing last year.

Tradeoff, I guess.

dpg · 04-01-2009, 07:32 AM

Yes...Moss will degrade roof shingles in time. They tend to bond themselves to the shingle (for lack of a better word.) They hold a lot of moisture when wet.

Happy Gourmand · 04-01-2009, 08:10 AM

I heard somewhere that a mixture of water and household bleach will take care of the problem.

SAMIAM · 04-01-2009, 11:32 AM

I just got up there with a stiff brush and it rolled right off without any damage to the shingles.

jmen24 · 04-01-2009, 04:20 PM

Pressure wash from the top down with a mixture of Simple Green (Non-toxic) and Water. Always pressure wash roofs from the top down. If you are concerned about doing this, hire someone that does this all the time, painters are a good place to start. I would refrain from using a brush with anything more than a medium brisle and at that rate you are not removing much. You will remove some of the particles from the shingles and you will void the warranty on your roofing product, remember most roofs come with a 30 year warranty.

Rock salt will also kill everything under your eaves so I would refrain from using.

Apply the zinc strips after your roof is clean, the strips need to be nailed off under the top coarse of shingles as to protect against leaking, do not just nail them on.

The flashing around chimneys is lead and that is why you will not see mold below chimneys.

03-31-2009, 09:32 PM	#1
gravy boat Senior Member Join Date: Apr 2004 Location: Gilford year round, West Alton summers Posts: 596 Thanks: 597 Thanked 203 Times in 102 Posts	moss? Since I replaced my old shingled roof with a metal roof I haven't seen a lick of moss. Snow, however, tends to build up as it slides off. And we won't soon forget how, last year, a particularly large build up of snow and ice blew out part of our deck railing last year. Tradeoff, I guess.

04-01-2009, 08:10 AM	#3
Happy Gourmand Senior Member Join Date: Jul 2008 Location: Ruskin FL Posts: 1,027 Thanks: 188 Thanked 322 Times in 179 Posts	Moss.. I heard somewhere that a mixture of water and household bleach will take care of the problem.

04-01-2009, 04:20 PM	#5
jmen24 Senior Member Join Date: Feb 2009 Posts: 1,139 Thanks: 223 Thanked 319 Times in 181 Posts	Moss Pressure wash from the top down with a mixture of Simple Green (Non-toxic) and Water. Always pressure wash roofs from the top down. If you are concerned about doing this, hire someone that does this all the time, painters are a good place to start. I would refrain from using a brush with anything more than a medium brisle and at that rate you are not removing much. You will remove some of the particles from the shingles and you will void the warranty on your roofing product, remember most roofs come with a 30 year warranty. Rock salt will also kill everything under your eaves so I would refrain from using. Apply the zinc strips after your roof is clean, the strips need to be nailed off under the top coarse of shingles as to protect against leaking, do not just nail them on. The flashing around chimneys is lead and that is why you will not see mold below chimneys.

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04-01-2009, 07:32 AM	#2
dpg Senior Member Join Date: Apr 2004 Posts: 2,624 Thanks: 157 Thanked 236 Times in 173 Posts	Yes...Moss will degrade roof shingles in time. They tend to bond themselves to the shingle (for lack of a better word.) They hold a lot of moisture when wet.

04-01-2009, 11:32 AM	#4
SAMIAM Senior Member Join Date: Apr 2004 Location: Moultonborough Posts: 2,937 Thanks: 349 Thanked 1,708 Times in 602 Posts	I just got up there with a stiff brush and it rolled right off without any damage to the shingles.