US2108350A - Metal roofing - Google Patents

Description

Patented Feb. 15, 1938 VUNITED As'mint'.:s

PAT-ENT FPi-CE 2.108.350' j v l RoolrusrdV Karl Roth, Terre Haute, Ind. 'Y Y" 1 Application July 1.6, 193.7, 1seria-1N41f1f5a955 1 claim. lering-18') `'Illhis invention relates to metal roofing `and has for a primary object the provision of a metalY sheet unit which may be used in multiple in laying roofs, the main feature being -that each 5v unit may be originally coated in a flat sheet and then rolled or otherwise formed into such shape that there will be no ,sharp bends but only smooth, rounded corners, whereby the coating may remain firmly attached to the lsheet Withlol out vdanger of its peeling at the bends or 4curves as has been heretofore encountered in roofing units of the nature herein employed.

A still further'important advantage of the vinvention is that the individual units may be lsel5` cured to the roof sheathing by nails driven through a corrugation of major height and,

additional nails may be driven through intermediate corrugations of minor height so as to bring the individual units down into rm contact with the sheathing Vwhere irregularities Aof the sheathing may exist. A still further important featureA of the inven tion is that the major corrugations may have y the side walls closely approach the perpendicular 25. SO as to resist distortion Whenthesecuring nails are driven therethrough.

A still further important feature of the invention is found in the particular joint between the adjacent units which effectively prevents Water leakage and'at the same time avoids any sharp bends in the marginal edges of the sheets.

These and many other important features and advantages of the invention will be apparent to those versed in the art in the following description of the invention as illustrated in one parvticular form in the accompanying drawing, in

which:

Fig. 1 is a top plan view of a fragment of roof embodying the invention.

Fig. 2, a transverse vertical section on line 2 2; and

Fig. 3, a detail in vertical transverse section through a. modied form of lap between the sheets.

Like characters of reference indicate like parts throughout the several views in the drawing.

The metal sheet, generally designated by the numeral I0, is initially provided with some protective coat, such as zinc, while still in the flat sheet. The coated sheet is then pressed or preferably rolled to provide a plurality of spaced apart major ridges II, herein shown as three in number. Between these major ridges II are a 55 plurality of minor ridges I2 with intervening grooves I 3,providing the sheet with major and minor .corrugatonsf Referring toFig. 2,` sheet Ill when laid in the position indicated, has on its. right hand side a tail piece I4, extending outwardly from the lower end of the outer ridge II in the plane including the under sides of the groovesr I3. The `flat tail portion' `I4 continues from. under the rst groove I3, across under the rst minor ridge I2 and then curves upwardly and around under the second minor ridge I2 in a' compressive contact thereunder to terminate in a line at least s1ightly beyond the center of the second minor ridge I2.. Also itis to be noted that the rst ridge ll, onuthe 'left hand side of the sheet I0 in this case, has its-outer lower longitudinal edge I5 spaced a distance above the bottom of the groove I3 suiici'ently to preventwater coming down the roof Yfrom passing thereunder. That is, the edge I5-is spaced above any likely depth of water that may appear `on the roof. This left hand ridge I'I lapsl over lthe right hand major ridge'I I' and has the rst two grooves I3 resting by their undersides on the tail portion I4 of the next adjacent sheet. What moisture may creep up- Wardly-past edge I5, under the overlapping ridge I'I and over the -underlapping ridge 'I-I is caught over the tongue I4 as it approaches the minor ridge I2 in an air space there provided to break up the capillary action. This trapped moisture may then flow downwardly over the tongue portion I4 without travelling further transversely since the right hand end of the tongue I4 curls up and under and is in contact with the under side of the second minor ridge I2.

As indicated in Fig. 3, the major ridges II are of considerable elevation, in fact, are made to be higher than the ridges heretofore commonly employed in a corresponding sheet. The main feature in these major ridges II is that their side Walls are carried upwardly to approach the perpendicular plane, whereby these ridges will not become distorted when the securing nails I6 are driven downwardly therethrough in the sheathing I1 thereunder. These nails I6 are preferably` provided with lead washers I8 under'their heads as is the usual practice to prevent leakage around the nails. It is to be noted that by providing these major ridges Il, through which the nails enter, combined with the minor corrugations, there are no sharp bends at the base of the major ridges as has heretofore been the case, and yet suicient rigidity is secured to permit driving the nails I6. Furthermore, by providing the minor corrugations between the major ridges there is sufficient elasticity to provide pushing toward the side Walls of the major ridges in opposition to downward and spreading action by the pressure occasioned by driving the nails I6 as will cause permanent pressure against the lead Washer I8, to maintain a permanent Water seal without lifting the nails and at the same time permit expansion and contraction of the sheets under various weather conditions. Again as above indicated, such as when there may be irregularities in the spacing and elevation ofthe sheathing boards II, nails may be driven through the minor ridges I2 as desired, all-without occasioning leakage through the sheet, since these minor ridges I2 have their upper portions above the usual level that may be reached. p As indicated in Fig. 2, the tail portion extending from the right hand ridge II, may be shortenedV from the tail I4 as indicated in Fig. 2, to have the tail portion I9 in Fig. 3 extend in a at manner from under the first groove I3 across the first minor ridge I 2 and then turn upwardly into'ntimate contact with theouter downwardly sloping portion of the ridge I2, whereby an air space 20 is provided to break up capillary action between the overlapping sheet portion. f This modified form as shown in Fig. 3 may be utilized where the sheet employed in Fig. 2.

It is therefore apparent that in` the .unique structure above described, a great many advantages are to be had over and above the vtype of metal roof sheets heretofore employed. There are no sharp bends, grooves, nor ridges in my structure so that there is no occasion for the coating to start peeling at any place as afresult of the forming of the sheet. Corrugations are formed of sufficient radius to prevent separating ofthe coating from the sheet. Not only are the above indicated mechanical features obtained in myinvention, but there is a highly desirably aesthetic appearance obtained by reason of the existence of the minor corrugations between the major ridges. An additional feature that may be noted in the sheets formed in accordance with this invention, is that they may be nested and shipped readily without damaging the longitudinal edges as is Ill is of a narrower width than thatapparent in heretofore experience with sheets formed with V-like longitudinal edges.

While I have herein described my invention in the form as is now known to me, it is obvious that structural changes may be employed without departing from the spirit of the invention and I therefore do not desire to be limited to that precise form beyond the limitations of the following claim.

I claim:

VA coated metal roofing sheet comprising a plurality of spaced apart upwardly extending major ridges, a plurality of corrugations intervening between said ridges, the under sides of the grooves of thev intervening corrugations being in a common plane and the upper sides of the ridges of the intervening corrugations being in a common plane, the upper sides of said major ridges being Vin a plane removed above the upper plane of said corrugation ridges, said major ridges being curved upwardly from` a groove of said vcorrugations lto have aside wall sloping but slightly outwardly from the perpendicular and having a top curving over and around therefrom into a downturned side wall of the same rate of but oppositely directed slope as that of the first wall, all of the said grooves and ridges including those in said corrugations and said major ridges being of suflicient curvature when formed as will retain said coating thereover in intimate contact without rupture, one of said major ridges being along one side of the sheet and having its outer downturned wall terminating by a longitudinal edge at an elevation at least as high as the tops of the ridges' of said corrugations, and another of said major ridges being adjacent to the opposite sheet edge to have the outer wall of that ridge curved around into a laterally extending tongue in a plane common to that of the undersides f said corrugations, and an outer upturned end'on said tongue, said tongue end being positioned under the second of the minor ridges of said corrugations, said tongue end being curved around under and in intimate Contact with the underside of that second minor ridge. v l

KARL ROTH.

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