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Old 06-05-2013, 04:51 AM   #16
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Moss on asbestos shingles


Leave the moss alone--decades of weathering will have loosened asbestos fibres on the surface, which the moss and algae are holding in place. Remove the moss, and those loose fibres can get airborne

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Old 06-05-2013, 10:45 AM   #17
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Moss on asbestos shingles


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Leave the moss alone--decades of weathering will have loosened asbestos fibres on the surface, which the moss and algae are holding in place. Remove the moss, and those loose fibres can get airborne

From what I have read this asbestos scare is like the mold paranoia. The fear generated makes lawyers and abatement companies rich. If I do the job I will wet the shingles and use a respirator, but I doubt doing one job one time will hurt anyone. If the moss will grow and cause the shingles to lift I certainly do want to get it off. If it is just cosmetic I do not care.

Do you know of any chemical I can spray on the shingles to extend their life?
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Old 06-05-2013, 10:51 PM   #18
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Moss on asbestos shingles


I've never heard of moss being able to lift the shingles but I guess it is possible. Have you seen it?

Asbestos health hazards are not just paranoia but you are correct that removing those shingles is not a major challenge as I stated earlier. I do recommend wearing a respirator but I would not advise wetting the shingles. Unnecessary pain in the buttox as well as a possible safety hazard.
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Old 06-06-2013, 07:59 AM   #19
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Moss on asbestos shingles


You want to "extend the life" of shingles that were installed 80 years ago? You should carefully remove them and put them in the Smithsonian. God knows they don't owe you anything.

As far as AB goes, when you remove them wet them down with a 3 to 1 mixture of water/glycol (antifreeze) mixture, then wear a good repirator.

Were I you, I would get them off while they are still in relatively good shape.

As I said before, it is probable that the felt below the shingles has been keeping the water out for the last few years.

If I recall correctly, individual rolls of #30 felt were installed between each course of asbestos shingles. Let us know if this is the case, will you?

EDIT: Yeah ONB might well be correct re wetting, glycol will make this roof as slippery as trying to grab an eel out of a bucket of snot.
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Old 06-06-2013, 09:24 AM   #20
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Moss on asbestos shingles


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Were I you, I would get them off while they are still in relatively good shape.
The house was built in the 30s, but I do not know when these shingles were put on. I just do not see any reason to remove shingles when the roof is not leaking.
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Old 06-06-2013, 09:58 AM   #21
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Moss on asbestos shingles


The roof could be leaking you might just not see it.

I had my roof leak one time and it ran down the wall to the basement where there was a floor drain so I never saw any visible damage until I did a remodel.

This may not be your case but I would get a new roof if it is that old.
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Old 06-06-2013, 10:42 AM   #22
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Moss on asbestos shingles


He's only concerned about moss removal. Why is everyone telling him to replace his roof?
It is not uncommon for these shingles to last this long. As I said earlier they are durable as hell . Their main enemy is impact damage.
There are many many old craftsman homes around here from that era and the asbestos shingles on them are still in great shape.
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Old 06-06-2013, 10:53 AM   #23
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Moss on asbestos shingles


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He's only concerned about moss removal. Why is everyone telling him to replace his roof?
It is not uncommon for these shingles to last this long. As I said earlier they are durable as hell . Their main enemy is impact damage.
There are many many old craftsman homes around here from that era and the asbestos shingles on them are still in great shape.
Yeah, you may be right ONB. I just assumed they were the old AB shingles made by Manville back in the 30's and 40's, there have been a few others produced much more recently than that, like Suprador Super Slate, (Now defunct from lawsuits) and I know that Eternit made one too. So much for assuming.

Pictures sure would have helped in this case.
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Old 06-06-2013, 11:20 PM   #24
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Moss on asbestos shingles


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Pictures sure would have helped in this case.
Yes they would. I tell ya though I see many of those shingles still on houses around here and they are holding up extremely well. Tore one off last year that were in excellent shape. The owner just built a new shop/garage and wanted everything to match so we removed them and installed new grand canyon on everything.
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Old 06-07-2013, 03:33 AM   #25
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Moss on asbestos shingles


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Yes they would. I tell ya though I see many of those shingles still on houses around here and they are holding up extremely well. Tore one off last year that were in excellent shape. The owner just built a new shop/garage and wanted everything to match so we removed them and installed new grand canyon on everything.
I still see quite a few of these roofs here, too. Mostly the corrugated sheets, but some shingles too. They last well unless damaged by impact or being walked on. My advice is if it isn't leaking, leave it alone. In saying that, I have seen them cleaned by spraying with moss killer then once the moss is dead and starting to come loose, the roof is washed with low pressure water taking care to collect the wastewater and debris which must be disposed of at a licensed AB disposal site. Then the roof is either sealed with a silicone based water repellent, or a specially designed paint coating.

Failure of the corrugated sheet roofs is usually because the fasteners rust out--I have stripped roofs from the 20s and 30s where the sheets have been sound apart from having loose AB fibre on the surface, but hardly anything left of the fasteners, and plenty of rot in the battens/purlins from water getting past the fasteners.

James Hardie were the main manufacturer here, there were a couple of small mfgr's as well, the names escape me now.
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Old 06-07-2013, 03:08 PM   #26
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Moss on asbestos shingles


There is no doubt about it. Asbestos is without question the best, and most maligned building materials that has ever existed, and one that is almost universally misunderstood.

A couple of years ago, I sent a long letter to one of our so called conservative senators from MD regarding the incredible waste of taxpayers money that was going on regarding asbestos abatement with regard to built up roofing systems on schools and other institutions, and how the state could save a lot of money with regard to this issue. I received a form letter from an aide thanking me for my letter, and would I like to contribute 50-100- or 1000 to the senators reelection?

A big change was made in OSHA several years ago in how low slope roofing containing AB was handled. In their infinite wisdom, they ruled that if there was only AB in the flashing, then it was to be considered incidental, and of no consequence.

Now anybody that knows anything about the older built up roofs knows that generally speaking, (Not always now) AB 20 was used in flashings only due to its relatively high cost, compared to organic (cellulose based) felts. They also know that when AB was used in the field sheets it remained encapsulated in asphalt, and was usually flood coated with asphalt and gravel, and therefore posed no hazard.

Now since the AB was used as a flashing material for base flashings, the sun would oxidize the asphalt over time, and since the AB was so durable it was the only thing left after about 35 years. Eventually it broke down and became friable, presenting a hazard.

So the bottom line is that where AB actually became a hazard, they ruled it as incidential, and where it was no hazard at all they ruled it as hazardous, and said it must be abated.

I guess it was the same guys that ruled on Agent Orange. The stuff that killed a lot of my friends after getting dosed with it in Nam.

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