roof jackn.
/ˈruːf dʒak/, /ˈrʊf dʒak/, U.S. /ˈruf ˌdʒæk/, /ˈrʊf ˌdʒæk/ Originally and chiefly North American.
1. A platform or other support erected on a roof to facilitate repair, painting, etc. Cf. window jack n. at window n. Compounds 2.
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1896 San Francisco Chron. 11 Aug. 10/4 He was about to change the position of his roof jack, used as a hold by shinglers.
1899 Denver Evening Post 19 Apr. 5/3 Jones was painting the roof at the above number when the roof-jack which holds the ladder in place slipped.
1911 Pop. Mech. Feb. 281/1 (heading) Roof Jack for Holding Paint Pots.
1975 Amer. Speech 1969 44 23 Roofjack, n. 1. A 12′ to 14′ plank with cleats affixed to shingles or embedded into roof material and which supports the painter; it serves as a platform from which steeply pitched roofs are painted. 2. A platform made for the pitch of a roof, flexible and made of wood; it is raised level against the pitch of the roof and thus allows the roof to be worked.
2005 M. W. Litchfield Renovation (ed. 3) 121/1 If it's steep, use roof jacks to create a safe working platform.
2. A smoke vent of a chimney; (also) an airtight fitting attached to the roof and joining the internal and external sections of a vent pipe. Cf. chimney-jack n. (a) at chimney n. Compounds 2; smoke-jack n. 2.
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society > inhabiting and dwelling > inhabited place > a building > parts of building > roof > [noun] > other parts of roof
water1703
flanching1833
slate-boarding1833
slate-board1842
break-back1856
parapet line1886
sunroof1889
overcloak1896
roof jack1913
society > leisure > the arts > visual arts > architecture > other elements > [noun] > chimney > specific part
block1775
roof jack1913
1913 J. Mätter Three Farms 125 He will stay at home for a week at a time, his light will be the last extinguished, and the smoke of his breakfast fire the last to issue from his roof-jack.
1946 Pop. Mech. Mar. 148/2 1 stove vent..1 curved roof jack to fit above vent.
1970 R. Paterson & J. Paterson Cranberry Portage xiv. 88 Cranberry settlement squatted beneath a shifting smoke blanket, upheld by blue-grey columns spinning upwards from a hundred galvanized roof jacks.
1994 P. Hemp Plumbing House (2001) v. 114 The roof jack seals the opening around the vent pipe and helps to support it in a vertical position above the roof.
1995 D. V. MacCollum Constr. Safety Planning xxxi. 235 Where smoke pipes from heating apparatus pass through combustible walls or roofs, UL- or FM-approved properly insulated and ventilated sleeves or roof jacks should be used.
3. A pole supporting the roof of a tent. rare.
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society > inhabiting and dwelling > inhabited place > dwelling place or abode > a dwelling > tent > [noun] > pole
prick1497
rig-treea1642
ridge pole1729
lodge-pole1805
pike1827
roof jack1958
1958 J. G. MacGregor North-West of 16 iii. 42 Beside the roof-jack it [sc. some animal] lay all night, and there..was a bulge it made in the roof of the tent.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online March 2022).
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n.1896