. An annotated list of the important North American forest insects. Forest insects. Preventing Damage by Termites or White Ants 9 method, liowevcr, is not generally recommended, since it will preserve the wood for onl}^ a few years. The supports of porches or steps should never be laid directly on the o-round, but should rest on rock or concrete. WindoAv sills and frames in the basement or cellar should be laid over concrete and the woodwork should not come in contact with the ground. The supports of the woodwork of coal bins in basements or cellars should not be set in the ground, but should
. An annotated list of the important North American forest insects. Forest insects. Preventing Damage by Termites or White Ants 9 method, liowevcr, is not generally recommended, since it will preserve the wood for onl}^ a few years. The supports of porches or steps should never be laid directly on the o-round, but should rest on rock or concrete. WindoAv sills and frames in the basement or cellar should be laid over concrete and the woodwork should not come in contact with the ground. The supports of the woodwork of coal bins in basements or cellars should not be set in the ground, but should rest on concrete, not extending through the concrete into the soil. Concrete flooring.—Even in permanent stone or concrete and steel buildings the concrete flooring is often constructed Fill. 11 1 .niMii. oarthlike, shelter tubes constructed by the eastern ijpiJlliUiiLllliean termite I'rtieiiUitermes flavipes over brick wall in dark, heated, damp Ibasemient; these tubes are used in passing over impenetrable substances. Inset, near view of tubes to show texture Usually the base of the concrete floor is a loose combination of coarse gravel or cinders and cement grout. This very rough con- glomerate, even if several inches thick, has many cracks and large holes running through it. Over this is laid a layer of solid concrete about 2 or 3 inches thick, of fine texture, in Avhich untreated wooden sleepers are laid while it is still moist. These sleepers nearly or quite reach the coarse, open conglomerate in contact with the earth, and to them is nailed the wooden flooring. (Fig. 17, A.) It will be seen that this is faulty construction. Termites have free access from the earth, in which they have galleries, through the porous conglomerate, to the untreated beams and flooring. There should be a layer of solid concrete at least 1 inch thick betiveen the grout and the icood. (Fig. IT, B.). Please note that these images are extracted from scanned page images that may have b
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
