A treatise on architecture and building construction . Fig. 50. 140. The g:aiTil>Tel roof is shown in Fig. 51; theterm gainbrcl signifies a bend, or crook, and in this case 72 Fig. 51. emphasizes the break in the continuity of the roof plane. The ends of this roof arealways of the gable form,as shown at abcde^ butthe slope from the ridgeto the eaves is broken,the upper part c dc beingsomewhat flat, and thelower parts cb and ea de-cidedly steep. This form had its originin the endeavor to providea roof that would securemore space in the garret, orattic, by increasing the height ne
A treatise on architecture and building construction . Fig. 50. 140. The g:aiTil>Tel roof is shown in Fig. 51; theterm gainbrcl signifies a bend, or crook, and in this case 72 Fig. 51. emphasizes the break in the continuity of the roof plane. The ends of this roof arealways of the gable form,as shown at abcde^ butthe slope from the ridgeto the eaves is broken,the upper part c dc beingsomewhat flat, and thelower parts cb and ea de-cidedly steep. This form had its originin the endeavor to providea roof that would securemore space in the garret, orattic, by increasing the height near the eaves, where a straightgable would give no head room. Its prototype is foimd inthe Mansard roof, which was the invention of a Frenchman,whose name it bears. The proportions of the example in Fig. 51 give the risefd as equal to one-half the span ha, which is the commonproportion of this form of roof; the pitch de should neverbe more than 30° from the horizontal, and the inclination e ashould not be less than 60°. In framing a gambrel roof it is always necessary to havea plate or curb at c h, as well as at a /, the rafters betweenthem being ciit to foot on a /, and to rest the
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Keywords: ., bo, bookcentury1800, booksubjectarchitecture, booksubjectbuilding
