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Publication numberUS1920931 A
Publication typeGrant
Publication dateAug 1, 1933
Filing dateFeb 17, 1930
Priority dateFeb 17, 1930
Publication numberUS 1920931 A, US 1920931A, US-A-1920931, US1920931 A, US1920931A
InventorsFinley Dozier
Original AssigneeParaffine Co Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Roofing material
US 1920931 A
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Description  (OCR text may contain errors)




Patented Aug. 1, 1933 UNITED STATES ears Paraffine Companies, Inc.,

San Francisco,

Calif., a Corporation of Delaware Application February 17, 1930. Serial No. 429,040

3 Claims.

My invention relates to roofing material and particularly to such material having a metallic coating.

One of the objects of the invention is the provision of a roofing material in which the metallic coating can not be stripped 01f the body of the material, and hence is subject to minimum damage from handling.

Another object of the invention is the provision of a metallic coated roofing which is flexible and of light weight.

A further object of the invention is the provision of a metallic coated roofing in which a wide variety of metallic substances may be used, and hence, a wide range of colors and textures made possible.

The invention possesses numerous other objects and features of advantage, some of which, with the foregoing, will be set forth in the following description of my invention. It is to be understood that I do not limit myself to this disclosure of species of my invention, as I may adopt variant embodiments thereof within the scope of the claims.

The figure of the drawing is a perspective view of a piece of roofing embodying the invention.

In the practice of making metal clad roofing materials, it has been customary to apply the metal coating over a granular mineral surfaced composition base, by an electroplating process. This roofing involves considerable expense in manufacture, is restricted to the choice of metals used, and is no lighter in weight than the usual granule surfaced roofing, since it contains granules plus the additional metal coating.

When an electroplated roofing is laid in shingle form it suffers in appearance from loss in shadow lines, because the edges are covered with metal and consequently do not give a contrasting color with relation to the top surface of the shingle.

Furthermore, when a composition base is covered with a sheet of metal there is grave danger of the metal becoming loosened or even stripped from the surface during shipment or other handling. Once removed, the metal coating is difficult to replace in original form.

This invention overcomes the above mentioned difiiculties; and at the same time embodies those other features of appearance and protection which are desirable in roofing materials.

In terms of broad inclusion the invention comprises a body layer of decay-resistant material impervious to moisture, and having acovering base of treated fibrous material is provided underlying the body. The roofing material may be formed in sheets or shingles, depending on the mode of application.

In greater detail the invention comprises a body layer or coating 2 of decay-resistant mastic material which is impervious to moisture. A bituminous compound such as coal tar or asphalt possesses these qualities, and such a compound of medium hard grade is preferably used for this purpose.

In order to give sufficient rigidity to the roofing material a base layer 3 is preferably provided underlying the body layer or coating 2. The

in l

base 3 is preferably of fibrous material such as The body layer 2 is formed as a coating on the upper side of the base 3 and is applied in fluid state according to well known practice. A thin coating layer 4, preferably of a bituminous compound similar to that used for the body layer, is preferably formed on the lower side of the base 3 to give added protection thereto.

A covering layer 6 of metallic granules, overlying the body layer or coating 2, is preferably applied while the mastic layer'is in a soft state. The whole is then preferably rolled to evenly embed the granules in the surface of the body layer. The granules 6 may be of any metallic substance such as bits of sheet metal, fine shot or filings.

A particular feature of advantage of the invention resides in the fact that the granules 6 are secured to the roofing material by embedding them in a mastic layer. This permits the use of any kind or shape of metallic granules that may be desired. One type of granule that has proven very efiective is made by cutting up into small pieces, thin sheets of pure metal, such as rolled coppgr plate, thus producing fiat angular partilii e f the metal. Also, granules in the nature of filings, made by a cutting tool such as a file or a rotary tool of the milling cutter type, give striking results when used in accordance with the terms of the invention. Fine metallic shot, the making of which is a well known process, is another of the many forms which the granules 6 may take; and these may be used in original form or they may first be flattened.

Surfacing roofing materials with metallic granof metallic granules fixed thereon. Preferably 8. likes as herein disclosed, permit the use of metalliQ-gmnules other than the usually more expensive pure metals. It is possible to use granules composed of a cheap base metal, or mineral, plated with a more expensive metal. Also, bimetallic granules may be used, and striking color variations can be secured in this manner. These granules may easily be made from a bimetallic plate comprising a sheet of inexpensive metal on which a coating, such as copper, has been plated; the composite sheet being cut into smallangularhparticle s as previously described, either before or after plating.

It is also possible to use alloys for making the granules, and very good efiects are produced by using brass or bronze in this manner. Still another of the many possibilities in making the granules is to plate galvanically a pure metal, or a composite sheet of different metals, on a travelling belt, and then strip the deposit from the belt and cut it up into small angular particles. In fact, the use of metallic granules in this manner ofiers almost an endless number of possibilities, because their application on the roofing material does not depend on any particular characteristic of the metal or metallic particles used.

While it might be thought that the non-corrodible metallic particles are to be preferred to those easily and quickly corroded, yet the invention is not confined to metals difficult to corrode or corrosion-proof metals. For instance iron particles may be used. It is found that the iron granules will give the harmonizing color effects of a soft brownish or reddish brown color With traces of almost black when corroded.

Ordinary corrosion of iron particles on a roof will produce a hard scale-like product of corrosion many times larger in bulk than the original iron particles, and while some may be lost, a sufiicient amount will stay in place to serve as an ideal covering for the asphaltic layer below. In fact, the corrosion product, being several times the volume of the parent material, will tend to seal over all parts of the cementing asphalt, inclusive particularly of the many tiny areas not originally covered by the metallic particles. A minor amount of the ferrous corrosion may be had by using some of the more slowly corrodible forms of iron or steel, such as copper bearing steel, the stainless steels or similar alloys.

The roofing material may either be formed in sheets or in shingles, depending upon the method of application to a roof. If the material is to be .used in sheet form, its flexibility permits it to be 2. A roofing material comprising a bituminous layer,-and a variegated covering layer of substantially flat angular b i rgetallic granules overlying and paitiallfeiiib edded in thdbituminous layer. 3. A roofing material comprising a bituminous layer and a variegated surface covering layer of bi-metallic granules partially embedded. in the bituminous layer, said granules being in the form es cut from metallig plates each plate V ted on one side with a different metal.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2732311 *Jan 15, 1952Jan 24, 1956 Coating process of producing radiation-
US3484267 *Nov 22, 1966Dec 16, 1969Celotex CorpShingles resistant to discoloration by microorganisms
US4776142 *Jan 21, 1986Oct 11, 1988Hardesty George RMethod of installing a radiant barrier
US5283998 *Oct 7, 1991Feb 8, 1994Jong Slosson BRoofing tile
US6772569 *Feb 6, 2002Aug 10, 2004John Landus BennettTongue and groove panel
U.S. Classification428/570, 428/674, 428/328, 428/927, 428/624, 52/315
International ClassificationD21J1/08
Cooperative ClassificationY10S428/927, D21J1/08
European ClassificationD21J1/08