Covering for roofs and walls

Claim 1

COVERING FOR ROOFS AND WALLS COMPRISING A SKIN COMPOSED OF A PLURALITY OF SHEETS EACH HAVING A PAIR OF SUBSTANTIALLY PARALLEL SIDES, AND FASTENING MEANS, EACH SHEET ENGAGING AN ADJACENT ONE ALONG ONE OF ITS LONGITUDINAL EDGES, AND THE FASTENING MEANS COMPRISING BRACKETS ADAPTED TO BE FASTENED ON A SUPPORTING STRUCTURE, WHEREIN EACH OF SAID SHEETS COMPRISES A FIRST MARGINAL PORTION ALONG A FIRST ONE OF ITS SAID LONGITUDINAL EDGES, SAID FIRST MARGINAL PORTION COMPRISING A FIRST PART FOLDED INWARDS 180* ALONG ONE OF SAID SIDES OF THE SHEET, AN ADJACENT SECOND PART FOLDED OUTWARDS THROUGH 180* FROM SAID FIRST PART AND THERE BEYOND AND DEFINING THEREBETWEEN AN OUTWARDLY OPEN GROOVE, AND A TERMINAL THIRD PART EXTENDING FROM THE OUTER PORTION OF SAID SECOND PART IN A CURVED PATH TRANSVERSELY OF THE PAIR OF SIDES AND TO A POINT PAST A PROJECTION OF THE OTHER OF SAID PAIR OF SIDES AND DEFINING A CONCAVE SIDE FACING TOWARDS SAID GROOVE AND SAID OTHER SIDE SAID SHEET FURTHER COMPRISING A SECOND MARIGNAL PORTION ALONG ANOTHER OF ITS LONGITUDINAL EDGES SUBSTANTIALLY OPPOSITE TO THE SAID FIRST LONGITUDINAL EDGE, SAID SECOND MARGINAL PORTION EXTENDING TRANSVERSELY AWAY FROM SAID OTHER SIDE IN A DIRECTION OPPOSED TO SAID FOLDED FIRST PART, THEN OUTWARDLY SUBSTANTIALLY PARALLEL TO SAID OTHER SIDE AND THEN RETURNING TRANSVERSELY OF AND PAST A PROJECTION OF SAID OTHER SIDE, THUS FORMING A HOLLOW RIB ON THE SAID OTHER SIDE OF THE SHEET, AND THEREAFTER SUBSTANTIALLY OUTWARDS THUS FORMING A TERMINAL FLANGE, SAID TERMINAL FLANGE OF THE SECOND MARGINAL PORTION OF ONE SHEET ENGAGING SAID GROOVE OF THE FIRST MARGINAL PORTION OF AN ADJACENT SHEET, AND WHEREIN THE SAID BRACKETS EACH COMPRISE A CONVEX BACK PORTION ENGAGING THE INSIDE OF SAID HOLLOW RIB OF SAID ONE SHEET AT LEAST ON THE PARTS THEREOF EXTENDING TRANSVERSELY OF SAID SHEET, AND A FOOT PORTION EXTENDING FROM SAID BACK PORTION OF THE BRACKET INTO CONTACT WITH THE CONCAVE SIDE OF SAID TERMINAL THIRD PART OF THE FIRST MARGINAL PORTION OF SAID ADJACENT SHEET FOR APPLYING THE LATTER ONTO SAID SUPPORTING STRUCTURE.