I have been interested in the communications of your correspondent in regard to shingles. I have had over thirty years’ experience in building and repairing roofs. I have taken rifted pine shingles from off several roofs that were worn entirely through, at the line where the water falls from one shingle upon the next one below, while underneath the courses the shingles were as bright as when first laid.
Such is not the fact with sawed and cut shingles, from any kind of timber. The reason is, that sawed and cut shingles are cross-grained, so that water runs through the pores of the wood,—wets the under course, and, in wet seasons, seldom if ever dries.
The agents of decay are, air, water and heat. All are combined on a roof to produce decay, and you have the effect on all roofs made of sawed or cut shingles. I have replaced many roofs of sawed shingles, but they never were half worn; they were rotten and unfit to remain longer.
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