Walter’s Patent Metallic Shingles Compared with Slate.
Our shingles are not one-sixth the weight of slate, which greatly reduces the cost of the frame-work of roof. They readily conform to the shape of a roof, which slate will not do. Slate is not thoroughly fire-proof, as heat from an adjoining building on fire will cause the slate to crack, which would destroy the best roof in a few minutes, leaving the sheeting exposed. Especially is this the case if water is thrown on them while hot.
Our shingles are free from the many accidents to which slate roofs are liable, such as cracking from shrinkage of wood-work to which they are attached; breaking, caused by necessary repairs to the valleys or chimneys; and the effect of frost on defective slate. Such defects cannot always be avoided by ordinary observation. All builders of experience are aware of the expensive repairs necessary to keep a slate roof in good order, but perhaps the most inconsistent thing connected with the whole roofing business is the fact that nineteen-twentieths of all the houses covered with slate have gutters lined with the same material of which our shingles are made, while slate was used for covering because of its supposed durability.
Should anything fall on our shingles it would probably dent them without causing a break; but should it perforate them, the shingles can be replaced by another, or a leak can be soldered, and fire from an adjoining roof cannot more than injure the paint. They will cool off rapidly, retaining their shape.