Flexible roof coverings and support attaching means therefor

Claim 1

IN A ROOF OR WALL CONSTRUCTION, IN COMBINATION, A PLURALITY OF RIGID ELONGATED SUPPORT MEMBERS ARRANGED SUBSTANTIALLY PARALLEL AND SPACED FROM EACH OTHER; A PLURALITY OF ELONGATED SHEETS OF FLEXIBLE PLASTIC MATERIAL EACH HAVING A FIRST EDGE AND AN OPPOSITE SECON EDGE AND EACH HAVING AN OUTER SURFACE AND AN INNER SURFACE, SAID SHEETS BEING ARRANGED NEXT TO EACH OTHER OVER SAID SUPPORT MEMBERS AND ABUTTING AT LEAST WITH PORTIONS OF SAID INNER SURFACES THEREOF AGAINST EDGE FACES OF SAID SUPPORT MEMBERS, EACH OF SAID SHEETS BEING FORMED WITH ELONGATED DEPRESSIONS ON THE INNER AND CORRESPONDING PROJECTIONS ON THE OUTER SURFACE THEREOF AND SAID DEPRESSIONS BEING RESPECTIVELY ARRANGED IN ROWS EXTENDING TRANSVERSELY OF THE SHEET, SAID SHEETS EACH BEING FURTHER FORMED WITH A PLURALITY OF FLAPS INTEGRALLY CONNECTED ALONG ONE EDGE THEREOF TO THE INNER SURFACE OF THE SHEET AND PROJECTING THEREFROM, SAID FLAPS EXTENDING TRANSVERSELY TO SAID ROWS SUBSTANTIALLY PARALLELY TO EACH OTHER AND SPACED FROM EACH OTHER SO AS TO EXTEND PARALLEL TO RESPECTIVE SIDE FACES OF SAID SUPPORT MEMBERS, SAID PLURALITY OF FLAPS INCLUDING A FIRST FLAP EXTENDING ALONG SAID FIRST EDGE OF SAID SHEET AND AT LEAST ONE FURTHER FLAP ARRANGED SPACED FROM BOTH SAID FIRST EDGE AND SAID OPPOSITE SECOND EDGE OF SAID SHEET, WITH THE SPACES BETWEEN THE FLAPS THEMSELVES, AND THE SPACE BETWEEN SAID FURTHER FLAP AND SAID OPPOSITE SECOND EDGE OF SAID SHEET BEING FREE AND UNOBSTRUCTED, SO THAT THE SHEET PORTION BETWEEN SAID FURTHER FLAP AND SAID OPPOSITE SECOND EDGES OVERLIES ANOTHER ADJACENT COVERING ALONG AN EDGE THEREOF WHICH CORRESPONDS TO SAID FIRST EDGE, WITH SAID SUPPORT MEMBERS BEING RECEIVED IN SAID SPACES AND SAID FLAPS EXTENDING ALONGSIDE SAID SUPPORT MEMBERS; AND FASTENING MEANS EXTENDING THROUGH SAID FLAPS INTO SAID SUPPORT MEMBERS AND THEREBY SECURING SAID SHEETS TO SAID SUPPORT MEMBERS.