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w~ue. 3 co~u.,..e <br />floor joists give to the wall, the whole wall would lean in without cracking. <br />But with this support in place, the wall must bend between its base and <br />top. And this bending inevitably results in horizontal cracking. (See p. 31). <br />A third cause of plaster cracking is water leaking from interior pipes <br />or through windows, roofs, walls or foundations. <br />The United States Department of the Interior, Bure~~u of Mines, has <br />published a list' of......... . <br />EDF CRACKS IN WALLS A1'+AL7 CEILINGS <br />They are as follows: <br />1. Building a house on a fill. <br />2. Failure to make the footings wide enough. <br />3. Failure to carry the footings below the frost line. <br />4. Width of footings not made proportional to the loads they carry. <br />' Bulletin 442-Seismic Effects of Quarry Blosting <br />20 <br />