LAYING TIN ROOFING

Preparation of Surfaces

Tongue-and-groove sheathing boards should be laid under all tin roofs, and the lumber should be dry and well seasoned. Narrow boards arc preferable to wide ones, and the hoards should be free from holes, and of even thickness. A new tin roof should never be laid over old tin, shingles, or tar roofing. Sheathing felt is not necessary when the boarding is laid carefully, but is desirable on account of its cushion-like effect, in case the roof is ever walked on. If steam, fumes, or gases are likely to be formed in the building, waterproof building paper should lie laid over the boarding, to protect the under side of the tin.

Methods of Laying Tin Roofing

There are three forms of laying tin plate for roof coverings, known as flat-seam roofing, standing-seam roofing, and ribbed roofing.