corresponding end of portion 200 portion 100 has a flange at 125 extending radially inward away from surface 101 toward axis a portion 200 has a flange 225 at end 220 extending radially outward away from surface 201 and axis a hence the additional length of portion 100 forms a shoulder with portion 200 at ends 120 and 220 represented by flanges 125 and 225 respectively such shoulder facilitates assembly of a plurality of these tiles into a structure such as a roof flange 130 integral with portion 100 is provided at end 115 extending radially outward from surface 101 away from axis a flange 110 is terminated in a flange hook configuration as at 135 directed inwardly toward surface 102 and toward axis a it should be noted that flange 110 does not extend the entire length of portion 100 but terminates prior to reaching end 120 flange 225 at end 220 extends radially outward away from surface 202 and axis a and does not extend to the edges of portion 200 thus leaving scalloped cut outs thereat at 226 and 227 that limits the width of flange 225 and inhibits flange 225 from cooperating with flanges 105 and 235 flange 230 is integral with and is provided at end 215 which flange extends.