Grass

[Jacob]

Just googled "is moss bad for your roof" and you get pages of dire warnings from, guess who - moss removal specialists!
Scroll down and you get to moneysavingexpert and some common sense from comments.

 

[Daniel2]

I don't like moss.

 

[MikeK]

I don't like moss.

Neither do I, and fortunately I don't need to justify getting rid of it.

 

[Misterdog]

Artificial grass is an abomination.

How to Remove Moss From Artificial Grass (In 5 Easy Steps)

 

[Jacob]

How to Remove Moss From Artificial Grass (In 5 Easy Steps)

I did wonder. Looks like plastic grass can be even more problematic!

 

[baldkev]

Dodged that bullet

 

[highwood122]

What's all this moss anxiety thing about?
Moss on roofs is quite picturesque and utterly harmless. It may even protect the roof surface from heat extremes and weathering, as well as being slightly insulating. The only prob is blocked gutters very occasionally but it's very easy to scoop out and much less trouble than removing all of it.
Leave that moss alone!
And save yourself a lot of unnecessary effort and expenditure.

when the weather is wet then freezing say at night the moss roots expand and chip some kinds of clay tiles, been there done that. if you live in amongst a lot of trees and get moss, thats what the anxiety is all about

 

[Geoff_S]

What's all this moss anxiety thing about?
Moss on roofs is quite picturesque and utterly harmless. It may even protect the roof surface from heat extremes and weathering, as well as being slightly insulating. The only prob is blocked gutters very occasionally but it's very easy to scoop out and much less trouble than removing all of it.
Leave that moss alone!
And save yourself a lot of unnecessary effort and expenditure.

Well it’s not harmless on a hand made clay tile roof. It will start to fracture the tiles if left. Why? I don’t know, but it does.

 

[Daniel2]

Well it’s not harmless on a hand made clay tile roof. It will start to fracture the tiles if left. Why? I don’t know, but it does.

Plus it obstructs the rainwater runoff and allows the water to back up under the tiles.
Traditional rooves around here are +/- 25° pent (eta: pitch).

 

[Jacob]

Plus it obstructs the rainwater runoff and allows the water to back up under the tiles.
Traditional rooves around here are +/- 25° pent.

No it wouldn't be good on shallow pitches.

 

[Inspector]

Jacob for what it is worth moss on asphalt shingle and Cedar shingle/shake roofs hold the water and rot them. They need to dry out between rains and can't do that when covered in moss.

Pete

 

[Jacob]

Jacob for what it is worth moss on asphalt shingle and Cedar shingle/shake roofs hold the water and rot them. They need to dry out between rains and can't do that when covered in moss.

Pete

I'm not proposing that everybody everywhere should grow moss on their roofs, or in their lawns! It's just that there seems to be a bit of anxiety about the stuff!

 

[MikeK]

I'm not proposing that everybody everywhere should grow moss on their roofs, or in their lawns! It's just that there seems to be a bit of anxiety about the stuff!

I don't have any anxiety about moss. It is one of the easiest nuisances to banish.

 

[Inspector]

I'm not proposing that everybody everywhere should grow moss on their roofs, or in their lawns! It's just that there seems to be a bit of anxiety about the stuff!

You post implied that moss is not a problem and can be left. Several people responded to tell you it is. You don't like it when people point out errors in your comments and try to wiggle out from under them with excuses and exceptions. At least that's how I see it.

Pete

 

[Fergie 307]

Jacob "moss on roofs is quite picturesque, and utterly harmless". The first may be true, depending on your point of view. The second is most certainly not. The reality is that there are far more types of roofing that will be damaged by moss than not. Of course anyone having the idea that you might acknowledge that you are actually wrong is entirely delusional.

 

[BucksDad]

I think we can almost guarantee that insurance companies would deny any claims on roofs if there was a large build up of moss!

 

[Limey Lurker]

Nobody ever bothered about moss on roofs until jet washers came on to the DIY market! Back in the early 70s I had a jet washing business. Had an outside vehicle lift; did cars, taxis, coaches, lorries, diggers, boats, driveways, patios, walls, and factory floors, but never a roof.

 

[Jacob]

Jacob "moss on roofs is quite picturesque, and utterly harmless". The first may be true, depending on your point of view. The second is most certainly not. The reality is that there are far more types of roofing that will be damaged by moss than not. Of course anyone having the idea that you might acknowledge that you are actually wrong is entirely delusional.

Is there any evidence that moss harms roofs, other than the obvious thing of obstructing drainage?

 

[mwinfrance]

Depends on what your roof covering is made from.

 

[Misterdog]

Is there any evidence that moss harms roofs, other than the obvious thing of obstructing drainage?

Moss holds onto water like a sponge, when water freezes it expands by 9% so any small imperfection in the roofing material will be exposed to this hydraulic action.

When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%.

this is how the Egyptians quarried rock for the pyramids.

I have no affiliation to any moss removal company