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On the back side of my house, north side, the cedar shingles are wet underneath. What should I do? Replace all shingles on the back of house or just bottom row?
How is this preventable in the future?
You need to do some investigation, to find out why they are wet.
Once you found out why, fix the problem so it doesn't happen again and replace the damaged cedar.
Are you sure that it is only the shingles at the back of the house? It could be all your shingles but you don't notice on the other sides because the edges dry out quicker. What ever is the issue at the back of your house is probably the same for the other sides as well.