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Publication numberUS3494727 A
Publication typeGrant
Publication dateFeb 10, 1970
Filing dateNov 17, 1967
Priority dateNov 17, 1967
Publication numberUS 3494727 A, US 3494727A, US-A-3494727, US3494727 A, US3494727A
InventorsRapaport Stanley L
Original AssigneeRapaport Stanley L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Microbe resistant roof
US 3494727 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

,1. '2 g :5 g w Feb. 10,1970 s, L RAPAPQRT 3,494,727

. MICROBE RESISTANT ROOF Filed Nov. 17, 1967 FIG. 1

L/ L 1 L] 7 L 7 L %l L 7 7? L /1 L 7 FIG. 2

i 0 X o 0, 0 0* o United States Patent ABSTRACT OF THE DISCLOSURE A roofing material having incorporated therein particles of metallic elements capable of forming biocidal ionic solutions. The periodic formation of such solutions by rain or dew prevents the darkening of roofs by killing the fungus or bacteria.

BACKGROUND OF THE INVENTION This is a continuation-in-part of my copending application Ser. No. 398,623, filed Sept. 23, 1964 and now abandoned for Intrinsically Microbe Resistant Roofs.

In many tropical and semi-tropical areas it is quite common for roofs to be subject to a dark discoloration with age. While the exact cause of this phenomenon is not known, it is believed to be the result of biological action, such as microbial or fungal growths. The discoloration may be due to the growth itself or may be produced indirectly as a result of the organisms metabolic products. When the proper conditions exist, the discoloration can be so extreme as to change a white roof to black in a period of a few years. Northerly exposed roofs change more rapidly than southerly exposed roofs and the color change appears to be more pronounced in some neighborhoods than in others. The change affects roofs of all colors and, in all known instances, the color changes are toward black. The blackening is not only unsightly but ample, the water run-off pattern is free of the darkening.

This is probably due to the growth-retarding effect of the ions of slightly soluble salts of these elements. It has been suggested that thin metallic strips, such as copper, be mounted on shingled roofs to prevent such darkening. However, the application of such strips complicates the laying of a roof and thereby increases its expense. Furthermore, it is believed that a synergistic etfect may be achieved by use of two separate metallic elements in rather close physical conjunction. Accordingly, it is a primary object of the present invention to provide a roofing material which is itself biocidal without the application of extraneous elements. Another object is to provide such a roof in which the biocidal effect is enhanced to a greater degree than is possible by the use of any single metallic element.

SUMMARY OF THE INVENTION The present invention comprises a roofing material having embedded therein small particles, or chips, of at least one metallic element. The element is selected from those 'ng microbioeida ions,.Thereafter, normal weathering will resfilt m the pro notion of such ions which will be spread over the surface of the roof by the action of rain or dew.

3,494,727 Patented Feb. 10, 1976 BRIEF DESCRIPTION OF THE DRAWING For a further understanding of the present invention, attention is directed to the following description, the appended claims and the figures of the attached drawing, wherein:

FIG. 1 illustrates a portion of an asphalt shingle roof;

FIG. 2 is an enlarged view of a portion of the roof of FIG. 1;

FIG. 3 illustrates a portion of a rock-tar roof; and

FIG. 4 is an enlarged portion of the roof of FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The ions of a number of metallic elements have been found to have microbiocidal characteristics. These elements include, for example, copper, lead, and zinc. The objects of the present invention are achieved by incorporating the particles of one or more of such metallic elements directly into the roofing material. They may be included, for example, in the body or coating of an as phalt shingle roof during production of the shingles. In a tar or rock-tar roof, they may be incorporated by admixture into the roofing ingredients either prior to their application or during their application on the roof surface.

The effectiveness of the metallic inclusions may be synergistically increased by including two different metals. If one such metal is 'electronegative with respect to the other, galvanic action will take place, accelerating corrosion of the anodic metal when exposed to moisture. Suitable combinations of metals would include, for example, erea a in itoawith' particular reference to FIGS. 1 and 2 there is illustrated a roof comprising shingles 1. Embedded in the matrix of each of the shingles 1 are metallic copper chips 3 and metallic lead chips 4. As pointed out above, such particles form electrical couples which accelerate corrosion and thus result in an increased release of ions over that obtainable from either metal alone.

A modification of the invention is illustrated in FIGS. 3 and 4 wherein a rock-tar roof 2 has embedded therein copper chips 3 and lead chips 4.

It is to be understood that the present invention is not limited to the specific elements set forth but includes roofing materials having particle inclusions of any metals capable of releasing ions which are microbiocidal to the particular micro-organisms involved. It will also be apparent that the individual particles may be composite in nature. In other words, each particle may include both copper and lead or both zinc and iron. Various other modifications of this invention will be apparent to those skilled in the art. Accordingly: the foregoing description is to be construed as illustrative only, rather than limiting. This invention is limited only by the scope of the following claims.

What is claimed is:

1. A roofing material having embedded therein visually observable chips of metallic elements, the ions of said metallic elements being capable of producing microbio cidal effects on microbes coming into contact with said roofing material.

2. The material of claim 1 wherein said chips are copper.

3. The material of claim 1 wherein said chips are lead.

4. The material of claim 1 wherein said chips are zinc.

a 4i The material of claim 1 wherein said material is References Cited a shingle. q

The material of claim 1 wherein said chips are 7 UNITED STA'TES PATENTS zinc and including additional chips of iron. 2, 9 9/ 1938 Easllng 117-158 *1. The material of claim ll wherein each of said chips r 2,927,052 1/1960 Moudry 204"-1571 0 3,197,313 7/1965 Greiner 106-45 is a bimetallic admixture of copper and lead.

U1. 1 he material of clalm 1 whereln each of said chips MORRIS O. WOLK Primary Examiner a bimetallic admixture oi zinc and iron.

The material of claim 1 wherein said elements are B. S. RICHMAN, Assistant Examiner selected from the group consisting of copper, lead, zinc, 10 and combinations thereof.

llll. The material of claim 9 wherein some of said 21-2, 58; 52-517; lO6-15;117168; l61224, 271; chips are copper and others are lead. 424-131, 140, 145

Patent Citations
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US2129659 *Jul 22, 1936Sep 13, 1938Newton P EaslingInsectproof paper
US2927052 *Mar 20, 1953Mar 1, 1960Us Movidyn CorpProcess of producing oligodynamic metal biocides
US3197313 *Apr 16, 1962Jul 27, 1965Johns ManvilleAsbestos-cement products
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3884706 *Oct 25, 1972May 20, 1975Gaf CorpAlgicidal roofing granules
US3888176 *Oct 25, 1972Jun 10, 1975Gaf CorpAlgicidal post treated roofing granules
US3888682 *Oct 25, 1972Jun 10, 1975Gaf CorpAlgicidal post treated roofing granules
US3888684 *Oct 25, 1972Jun 10, 1975Gaf CorpAlgicidal roofing granules
US3894877 *Oct 25, 1972Jul 15, 1975Gaf CorpRoofing granules with enhanced algicidal post treatment
US4088810 *May 7, 1973May 9, 1978Minnesota Mining And Manufacturing CompanyAlkali metal silicate-zinc hydroxychloride coating composition
US4202858 *Mar 17, 1978May 13, 1980Gary BruceMoss killer
US4276732 *Aug 24, 1979Jul 7, 1981Sharon G. NielsenDevice for killing moss
US4416854 *Mar 29, 1983Nov 22, 1983Sharon G. NielsenMethod for killing water borne microorganisms
US4554862 *Jun 21, 1984Nov 26, 1985Air Vent Inc.Roof ridge ventilator for retarding microbe growth in shingle roofs
US4610783 *Feb 22, 1985Sep 9, 1986Paul HudsonControl of algae in re-circulating water systems
US4936898 *Apr 9, 1986Jun 26, 1990Nielsen James WAtomized elemental moss killer
US4937995 *Jun 16, 1988Jul 3, 1990Carlisle CorporationNoninvasively identifiable membrane roof system
US5216864 *Oct 31, 1991Jun 8, 1993Chicago Metallic CorporationUnique zinc alloy strip design for the inhibition of moss and fungus
US5356664 *Jun 11, 1993Oct 18, 1994Minnesota Mining And Manufacturing CompanyMethod of inhibiting algae growth on asphalt shingles
US5357726 *Aug 31, 1993Oct 25, 1994Chemfab CorporationComposite materials for structural end uses
US5411803 *Sep 15, 1992May 2, 1995Minnesota Mining And Manufacturing CompanyGranular materials having an improved ceramic coating, methods of preparing same, and composite sheets including same
US6214466Jul 28, 1999Apr 10, 2001Isp Investments Inc.Algae-resistant roofing granules
US6838152Jan 21, 2003Jan 4, 2005Isp Investments Inc.Low pigments costs algae-retardant roofing granule products containing metallic copper
US7788870Sep 7, 2010David SpencerMethod and roofing strip for retarding moss, fungi, and algae growth on roofs
US8197893Jun 12, 2012Building Materials Investment CorporationColored metal flake surfaced roofing materials
US8333639Dec 18, 2012Collister Kenneth FRidge vent with biocidal source
US8703166Jan 20, 2011Apr 22, 2014John FlynnSystems and methods for reducing microbial growth
US20030091795 *Oct 21, 2002May 15, 2003Matti KiikMetal flake-surfaced roofing materials
US20040139886 *Jan 21, 2003Jul 22, 2004Isp Investments Inc.Low pigments costs algae-retardant roofing granule products containing metallic copper
US20040247831 *Apr 27, 2004Dec 9, 2004Nakagawa Chemical Inc.Decorative sheet
US20050183220 *Jan 30, 2005Aug 25, 2005Hugo WeberCleaning system designed to be installed on a surface that is exposed to poor weather conditions
US20060035582 *Aug 9, 2005Feb 16, 2006Collister Kenneth FRidge vent with biocidal source
US20060194023 *Feb 25, 2005Aug 31, 2006Teng Yihsien HAlgae resistant shingle
US20070020436 *Jul 26, 2006Jan 25, 2007Teng Yihsien HRoofing shingle containing algae inhibiting metallic particles
US20080131664 *Oct 31, 2007Jun 5, 2008Teng Yihsien HRoofing shingle having agglomerated microorganism resistant granules
US20090117329 *Sep 19, 2008May 7, 2009Leitch Olan TColored Metal Flake Surfaced Roofing Materials
US20090291260 *Nov 26, 2009Matti KiikMetal Flake-Surfaced Roofing Materials
DE19904648A1 *Feb 5, 1999Aug 31, 2000Alexander FallerRoof covering treated with agent for prevention of plant growth, especially copper compound, useful for avoidance of premature roof damage
DE19954752A1 *Oct 22, 1999Apr 26, 2001Viktor ReinDevice for prevention and removal of deposits on roof coverings, especially roof tiles, has elements of metal or metal compound fitted by fastening device on ridge or other highest-most point of roof
DE102005027625A1 *Jun 15, 2005Jan 4, 2007Aktiv-First GmbhMechanism for preventing or killing of vegetation on a sloped sloped brick- and reed roof, comprises two different metal surface elements formed with perforation holes, napped texture and water storage folding
EP0318830A1 *Nov 24, 1988Jun 7, 1989Grillo-Werke AgTreatment of roofings and concrete surfaces against the growth of fungi and seaweeds
EP0727542A1 *Feb 15, 1996Aug 21, 1996Hugo WeberRoof panel and method for its manufacturing
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WO2004037723A2 *Oct 20, 2003May 6, 2004Elk Premium Building Products, Inc.Metal flake-surfaced roofing materials
WO2004037723A3 *Oct 20, 2003Jun 3, 2004Elk Premium Building Prod IncMetal flake-surfaced roofing materials
U.S. Classification52/517, 424/630, 424/646, 424/641, 422/291, 106/18.35, 424/652, 106/18.36, 428/489, 428/543
International ClassificationC09D5/14, E04D13/00
Cooperative ClassificationE04D13/002, C09D5/14
European ClassificationE04D13/00A, C09D5/14