. An annotated list of the important North American forest insects. Forest insects. Preventing Damage by Termites or White Ants 13 various patent or noiseless floorings are used on the ground floor they should always be laid oyer a concrete base, especially if they contain wood fiber as a constituent. In no case should untreated beams be completely surrounded with mortar or brick; there should be a space around them sufficient to permit air circulation. Beams should not be set in earth or in moist concrete, but on rock or dry concrete, or in grooves in the latter. Bungalows or frame buildings
. An annotated list of the important North American forest insects. Forest insects. Preventing Damage by Termites or White Ants 13 various patent or noiseless floorings are used on the ground floor they should always be laid oyer a concrete base, especially if they contain wood fiber as a constituent. In no case should untreated beams be completely surrounded with mortar or brick; there should be a space around them sufficient to permit air circulation. Beams should not be set in earth or in moist concrete, but on rock or dry concrete, or in grooves in the latter. Bungalows or frame buildings which have no cellar should be raised from the ground on stone, concrete, or brick foundations to a height whicli will allow light and air to penetrate beneath. Lime mortar.—In brick walls, where lime mortar is used, this some- times disintegrates after a few years and termites penetrate through the spaces thus left between the bricks, especially where the brick- work is below the ground level. (Fig. 16.) Such walls should be faced with Portland cement 1 inch thick, especially if untreated wood is to come in contact with the Fici. 16.—Interior view of portion of wliitewaslied In-ick foniulation wall of builil- ins, bolow srounrt level, showing! sliplter tubes of onr common subterranean termite (ReticuUtermrs sp.) penetratiuR the disintegrated lime mortar. These termites cam(^ through the earth banked up against the exterior wall. To remedy this condition the exterior wall will have to be faced with concrete for some distance below the ground level Use of chemically treated wood for interior woodwork, furniture, etc.— In the Southern States, especially in the subtropics, in the more A'aluable permanent buildings the interior woodwork, furniture, etc., should be impregnated with preservatives, since nonsubterranean termites that attack wood directly are common in those regions. Zinc chloride, bichloride of mercury,^ sodium fluoride, and chlori- nated naphthalene*^
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
