A small building may be roofed with felt alone in the following manner. The felt is placed upon horizontal battens which are sawn from the round trees, the edges being left rough, and the battens being placed with from 3 in. to i in. between them. The felt is put on from ridge to eave, passing over the ridge to the middle of the nearest batten. The felt is hooked or lapped to give four thicknesses, through which the nails can go. This roof will stand the test of many yea is, not a drop of water coming through, and is light, cheap, and strong.