laid side by side so that opposing sides of adjacent pairs of the strips have a overlapping corrugations 80 along their long dimensions fig4 the arrangement thus formed is shown in fig3 to form a pair of triangularly shaped pieces of the roofing 32 to cover two of the segments 28 the sheets 78 of fig3 are cut along dashed cut lines 82 as shown the resulting central isosceles triangle cut along the lines 82 in fig3 forms one of the roofing pieces for covering one of the segments 28 the remaining two right triangular pieces on opposite sides of the central triangle can be joined back to back along their sides 84 and similarly overlapping two inches to form the other roofing piece for covering a second one of the segments 28 each of the resulting segments 28 is laid between a different adjacent pair of trusses 34 a standard ridge cap 85 overlaps adjoining segments 28 and is fastened to the wood cross hexes 49 referring now to fig1 16 there is shown an alternative roof covering comprising a flexible waterproof tarpaulin 86 which can be used to cover the roof structure 22 of the previous example by making a few modifications in place of corrugated sheet metal roofing 32 one of.