First

According to the Old English Dictionary:

first

a rafter. Substitute: first, e ; f. I. a ceiling, inner roof :-- Fierst (first, hróf firsthróf ?), Corp. Gl. laquear, Txts. 74, 595: Wrt. Voc. ii. 50, 53. Fyrst, i. 26, 42 : 82, 15. Tóbærst þæs temples wáh-ryftUNCERTAIN fram ðǽre fyrste ufan oð ðá flor neoðan, Hml. Th. ii. 258, 3. Firste laquearia, Wrt. Voc. ii. 112, 45. Fierste, 50, 54. II. the ridgepole of a roof :-- First tigillum, Wrt. Voc. ii. 122, 43. Hróf camara, first paratica, i. 290, 3 (in a list ' de domibus'). Fyrst on húse hoc tignum uel tigillum, An. Ox. 183, 92. Ǽrest man ásmeáð þæs húses stede, and eác man ꝥ timber beheáwð . . . and þá ræftras tó þǽre fyrste gefæstnað, Angl. viii. 324, 9. [N. E. D. first. O. H. Ger. first culmen, pinna, tolas. '] V. first