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Question DetailsAsked on 9/12/2017

What do I need to spray on my ceder roof to help preserve it

I just put new red western shingles on my home. What can I spray on them to help preserve it.

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1 Answer


This is a good time to do it - before they get dirty or get anything growing on them.

Best products in my opinion - oil-based penetrating preservatives - though be aware they do tend to darken the shingles/shakes a fair amount. Shingle/shake preservatives from PPG/Olympic (the one I would recommend), Penofin, Cabot, Cedarlife are popular brand names for this sort of treatment.

If you expect moss/algae issues, some of the products have zinc or copper additive to inhibit that. You can also inhibit light accumulation of moss/algae by installing zinc strip (comes in 50' rolls about 2-1/2 to 6 inches wide - 4 inch or wider is better to get more exposure). You can also (though washes off in very heavy rains or if you aggressively wash your roof - though leaf blower can avoid that if clearing leaves) use MossOut powder for roofs (the spray-on does not seem to last or work well) sprinkled on every 1-5 years depending on tendency to grow moss/algae. However - there is at least one type of sun-tolerant yellow lichen which, at least in our area, tolerates zinc and copper unless used in pretty high concentration, and it does tend to put little gray spots on the roof, though as your cedar ages that will fade to unnoticeable.

Here is a previous response on cedar shingle SIDING but similar issues - also a couple of articles on the issue FYI:

Answered 2 years ago by LCD

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