US20200299967A1 - Method of reroofing - Google Patents

Method of reroofing Download PDF

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Publication number
US20200299967A1
US20200299967A1 US16/088,176 US201716088176A US2020299967A1 US 20200299967 A1 US20200299967 A1 US 20200299967A1 US 201716088176 A US201716088176 A US 201716088176A US 2020299967 A1 US2020299967 A1 US 2020299967A1
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United States
Prior art keywords
membrane
composite
adhesive
existing
coating
Prior art date
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Abandoned
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US16/088,176
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English (en)
Inventor
Jiansheng Tang
Michael J. Hubbard
Joseph Kalwara
Carl E. Watkins, JR.
Brian Alexander
Todd D. TAYKOWSKI
Joseph R. CARR
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Holcim Technology Ltd
Original Assignee
Firestone Building Products Co LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Firestone Building Products Co LLC filed Critical Firestone Building Products Co LLC
Priority to US16/088,176 priority Critical patent/US20200299967A1/en
Assigned to FIRESTONE BUILDING PRODUCTS COMPANY, LLC reassignment FIRESTONE BUILDING PRODUCTS COMPANY, LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TANG, JIANSHENG, TAYKOWSKI, TODD D., HUBBARD, MICHAEL J., CARR, Joseph R., KALWARA, JOSEPH, ALEXANDER, BRIAN, WATKINS, CARL E., JR.
Publication of US20200299967A1 publication Critical patent/US20200299967A1/en
Assigned to HOLCIM TECHNOLOGY LTD reassignment HOLCIM TECHNOLOGY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FIRESTONE BUILDING PRODUCTS COMPANY, LLC
Abandoned legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
    • E04D5/14—Fastening means therefor
    • E04D5/148—Fastening means therefor fastening by gluing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
    • E04D5/06—Roof covering by making use of flexible material, e.g. supplied in roll form by making use of plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof
    • B32B2419/06—Roofs, roof membranes

Definitions

  • Embodiments of the invention are directed toward methods of reroofing wherein a membrane carrying a factory-applied adhesive is applied directly to an existing membrane and/or additional substrates that are installed on the roof as part of the roofing event such as coverboards.
  • thermoset membranes such as those including cured EPDM (i.e., ethylene-propylene-diene terpolymer rubber) or thermoplastics such as TPO (i.e., thermoplastic olefins).
  • the membranes are typically delivered to a construction site in a bundled roll, transferred to the roof, and then unrolled and positioned.
  • the sheets are then affixed to the building structure by employing varying techniques such as mechanical fastening, ballasting, and/or adhesively adhering the membrane to the roof.
  • the roof substrate to which the membrane is secured may be one of a variety of materials depending on the installation site and structural concerns.
  • the surface may be a concrete, metal, or wood deck, it may include insulation or recover board, and/or it may include an existing membrane.
  • the individual membrane panels, together with flashing and other accessories are positioned and adjoined to achieve a waterproof barrier on the roof.
  • the edges of adjoining panels are overlapped, and these overlapping portions are adjoined to one another through a number of methods depending upon the membrane materials and exterior conditions.
  • One approach involves providing adhesives or adhesive tapes between the overlapping portions, thereby creating a water resistant seal.
  • the use of adhesives allow for the formation of a fully-adhered roofing system.
  • a majority, if not all, of the membrane panel is secured to the roof substrate, as opposed to mechanical attachment methods that can only achieve direct attachment in those locations where a mechanical fastener actually affixes the membrane.
  • the first is known as contact bonding whereby technicians coat both the membrane and the substrate with an adhesive, and then mate the membrane to the substrate while the adhesive is only partially set. Because the volatile components (e.g. solvent) of the adhesives are flashed off prior to mating, good early (green) bond strength is developed.
  • contact bonding whereby technicians coat both the membrane and the substrate with an adhesive, and then mate the membrane to the substrate while the adhesive is only partially set. Because the volatile components (e.g. solvent) of the adhesives are flashed off prior to mating, good early (green) bond strength is developed.
  • Another mode of attachment is through the use of a pre-applied adhesive to the bottom surface of the membrane.
  • an adhesive is applied to the bottom surface of the membrane.
  • a release film or member is applied to the surface of the adhesive. During installation of the membrane, the release member is removed, thereby exposing the pressure-sensitive adhesive, and the membrane can then be secured to the roofing surface without the need for the application of additional adhesives.
  • the pre-applied adhesive can be applied to the surface of the membrane in the form of a hot-melt adhesive.
  • a hot-melt adhesive For example, U.S. Publication No. 2004/0191508, which teaches peel and stick thermoplastic membranes, employs pressure-sensitive adhesive compositions comprising styrene-ethylene-butylene-styrene (SEGS), tackifying endblock resins such as cumarone-indene resin and tackifying midblock resins such as terpene resins.
  • SEGS styrene-ethylene-butylene-styrene
  • tackifying endblock resins such as cumarone-indene resin
  • tackifying midblock resins such as terpene resins.
  • hot-melt adhesives such as butyl-based adhesives, EPDM-based adhesives, acrylic adhesives, styrene-butadiene adhesives, polyisobutylene adhesives, and ethylene vinyl acetate adhesives.
  • peel and stick membranes have inherent limitations. For example, there are temperature windows that limit the minimum temperature at which the membranes can be installed on a roof surface. Also, there are maximum temperature limits on the roof surface that the adhesive can withstand while maintaining wind-uplift integrity. With respect to the latter, where the surface temperature on the roof nears the glass transition temperature of the adhesive, the adhesive strength offered by the pressure-sensitive adhesive is not maintained. As a result, peel-and-stick membranes have not gained wide acceptance in the industry. Moreover, the use of peel-and-stick membranes has been limited to use in conjunction with white membranes (e.g., white thermoplastic membranes) because the surface temperature of these membranes remains cooler when exposed to solar energy.
  • white membranes e.g., white thermoplastic membranes
  • Reroofing an existing roof generally includes the application of a newly fabricated membrane over the existing membrane. Reroofing presents challenges, especially where there is a desire to fully adhere the new membrane to an existing membrane, because the existing roof surface can provide an undesirable substrate for adhesive attachment. For example, the roof surface can be environmentally damaged, covered with debris, and/or can be relatively uneven.
  • Embodiments of the present invention provide a method of reroofing, the method comprising of applying to an existing roof surface a membrane composite including a pre-applied adhesive layer by mating the adhesive layer to the existing membrane.
  • FIG. 1 is a cross-section perspective view of a membrane composite according to embodiments of the invention.
  • FIG. 2 is a flow chart describing a process for making membrane composite according to embodiments of the present invention.
  • FIG. 3 is a schematic of a continuous process for making membrane composite according to the present invention.
  • Embodiments of the invention are based, at least in part, on the discovery of reroofing technique that includes the application of membrane having a pre-applied (e.g. factory-applied) pressure-sensitive adhesive that is at least partially cured directly to an existing membrane secured to the roof being reroofed.
  • the pre-applied adhesive is applied as a hot-melt adhesive and subsequently cured. It has unexpectedly been discovered that the nature of the pre-applied adhesive, including its initial tack and high-temperature strength, allows the membrane composite to be directly attached to the existing membrane.
  • a membrane 11 which may be referred to as a membrane composite 11 , is shown in FIG. 1 .
  • Membrane composite 11 includes polymeric panel 13 , pressure-sensitive adhesive layer 15 , and release member 17 removably attached to layer 15 .
  • the membrane may be a thermoset material. In other embodiments the membrane may be a thermoformable material. In one or more embodiments, the membrane may be EPDM based. In other embodiments, the membrane may be TPO based. In these or other embodiments, the membrane may be flexible and capable of being rolled up for shipment. In these or other embodiments, the membrane may include fiber reinforcement, such as a scrim. In one or more embodiments, the membrane includes EPDM membranes including those that meet the specifications of the ASTM D-4637. In other embodiments, the membrane includes thermoplastic membranes including those that meet the specifications of ASTM D-6878-03. Still other membranes may include PVC, TPV, CSPE, and asphalt-based membranes.
  • the roofing membrane panels are characterized by conventional dimensions.
  • the membrane panels may have a thickness of from about 500 ⁇ m to about 3 mm, in other embodiments from about 1,000 ⁇ m to about 2.5 mm, and in other embodiments from about 1,500 ⁇ m to about 2 mm.
  • the membrane panels of the present invention are characterized by a width of about 1 m to about 20 m, in other embodiments from about 2 m to about 18 m, and in other embodiments from about 3 m to about 15 m.
  • the pressure-sensitive adhesive layer (e.g. layer 23 ) is a cured pressure-sensitive adhesive.
  • this cured pressure-sensitive adhesive layer is formed from a curable hot-melt adhesive.
  • an uncured adhesive composition is applied to the membrane as a hot-melt composition (i.e. the composition is heated and applied as a flowable composition in the absence or appreciable absence of solvent), and then the composition is subsequently crosslinked (i.e. cured) to form the cured pressure-sensitive layer.
  • the cured pressure-sensitive adhesive layer may be an acrylic-based hot-melt adhesive.
  • the adhesive is a polyacrylate such as a polyacrylate elastomer.
  • useful polyacrylates include one or more units defined by the formula:
  • each R 1 is individually hydrogen or a hydrocarbyl group and each R 2 is individually a hydrocarbyl group.
  • each R 1 and R 2 are same in each unit.
  • at least two different R 1 and/or two different R 2 are present in the polymer chain.
  • hydrocarbyl groups include, for example, alkyl, cycloalkyl, substituted cycloalkyl, alkenyl, cycloalkenyl, substituted cycloalkenyl, aryl, substituted aryl, aralkyl, alkaryl, allyl, and alkynyl groups, with each group containing in the range of from 1 carbon atom, or the appropriate minimum number of carbon atoms to form the group, up to about 20 carbon atoms.
  • These hydrocarbyl groups may contain heteroatoms including, but not limited to, nitrogen, oxygen, boron, silicon, sulfur, and phosphorus atoms.
  • each R 2 is an alkyl group having at least 4 carbon atoms.
  • R 1 is hydrogen and R 2 is selected from the group consisting of butyl, 2-ethylhexyl, and mixtures thereof.
  • the polyacrylate elastomers that are useful as adhesives in the practice of this invention may be characterized by a glass transition temperature (Tg) of less than 0° C., in other embodiments less than ⁇ 20° C., in other embodiments less than ⁇ 30° C.
  • useful polyacrylates may be characterized by a Tg of from about ⁇ 70 to about 0° C., in other embodiments from about ⁇ 50 to about ⁇ 10° C., and in other embodiments from about ⁇ 40 to about ⁇ 20° C.
  • the polyacrylate elastomers that are useful as adhesives in the practice of this invention may be characterized by a number average molecular weight of from about 90 to about 800 kg/mole, in other embodiments from about 100 to about 350 kg/mole, in other embodiments from about 100 to about 700 kg/mole, in other embodiments from about 150 to about 270 kg/mole, in other embodiments from about 120 to about 600 kg/mole, and in other embodiments from about 180 to about 250 kg/mole.
  • the polyacrylate elastomers that are useful as adhesives in the practice of this invention may be characterized by a Brookfield viscosity at 150° C. of from about 10,000 to about 200,000 cps, in other embodiments from about 30,000 to about 60,000 cps, in other embodiments from about 30,000 to about 170,000 cps, in other embodiments from about 25,000 to about 150,000 cps, in other embodiments from about 30,000 to about 60,000 cps, and in other embodiments from about 40,000 to about 50,000 cps.
  • the polyacrylate elastomers may include polymerized units that serve as photoinitiators. These units may derive from copolymerizable photoinitiators including acetophenone or benzophenone derivatives. These polyacrylate elastomers and the adhesive compositions formed therefrom are known as disclosed in U.S. Pat. Nos. 7,304,119 and 7,358,319, which are incorporated herein by reference.
  • useful adhesive compositions are commercially available in the art.
  • useful adhesives include those available under the tradename acResin (BASF), those available under the tradename AroCure (Ashland Chemical), and NovaMeltRC (NovaMelt).
  • these hot-melt adhesives may be cured (i.e., crosslinked) by UV light.
  • the hot-melt adhesive is at least partially cured after being applied to the membrane, as will be discussed in greater detail below.
  • the adhesive is cured to an extent that it is not thermally processable in the form it was prior to cure.
  • the cured adhesive is characterized by a cross-linked infinite polymer network. While at least partially cured, the adhesive layer of one or more embodiments is essentially free of curative residue such as sulfur or sulfur crosslinks and/or phenolic compounds or phenolic-residue crosslinks.
  • the pressure-sensitive adhesive in its cured stated, provides sufficient tack to allow the membrane composites of this invention to be used in roofing systems that meet industry standards for wind uplift resistance.
  • this tack may be quantified based upon the peel strength when adhered to another membrane in accordance with ASTM D-1876-08.
  • the cured pressure-sensitive adhesive of the present invention is characterized by a peel strength, according to ASTM D-1876-08, of at least 1.8 lbf/in, in other embodiments at least 3.6 lbf/in, in other embodiments at least 8.0 lbf/in, in other embodiments at least 15 lbf/in, and in other embodiments at least 20 lbf/in.
  • the tack of the pressure-sensitive adhesive, in its cured state may be quantified based upon the peel strength when adhered to a construction board (e.g. insulation board) having a kraft paper facer in accordance with ASTM D-903-98 (2010).
  • the cured pressure-sensitive adhesive of the present invention is characterized by a peel strength, according to ASTM D-903-98 (2010) using an insulation board with kraft paper facer, of at least 1.5 lbf/in, in other embodiments at least 2.0 lbf/in, in other embodiments at least 2.5 lbf/in, in other embodiments at least 3.0 lbf/in, and in other embodiments at least 3.5 lbf/in.
  • release member 17 may include a polymeric film or extrudate, or in other embodiments it may include a cellulosic substrate. Where the polymeric film and/or cellulosic substrate cannot be readily removed after being attached to the asphaltic component, the polymeric film and/or cellulosic substrate can carry a coating or layer that allows the polymeric film and/or cellulosic substrate to be readily removed from the asphaltic component after attachment.
  • This polymeric film or extrudate may include a single polymeric layer or may include two or more polymeric layers laminated or coextruded to one another.
  • Suitable materials for forming a release member that is a polymeric film or extrudate include polypropylene, polyester, high-density polyethylene, medium-density polyethylene, low-density polyethylene, polystyrene or high-impact polystyrene.
  • the coating or layer applied to the film and/or cellulosic substrate may include a silicon-containing or fluorine-containing coating.
  • a silicone oil or polysiloxane may be applied as a coating.
  • hydrocarbon waxes may be applied as a coating.
  • the coating which may be referred to as a release coating, can be applied to both planar surfaces of the film and/or cellulosic substrate.
  • the release coating need only be applied to the planar surface of the film and/or cellulosic substrate that is ultimately removably mated with the asphaltic component.
  • the release member is characterized by a thickness of from about 15 to about 80, in other embodiments from about 18 to about 75, and in other embodiments from about 20 to about 50 ⁇ m.
  • the membrane panels employed in the membrane composites of the present invention may be prepared by conventional techniques.
  • thermoplastic membrane panels may be formed by the extrusion of thermoplastic compositions into one or more layers that can be laminated into a membrane panel.
  • Thermoset membranes can be formed using known calendering and curing techniques.
  • thermoset membranes can be made by continuous process such as those disclosed in WO 2013/142562, which is incorporated herein by reference.
  • the curable hot-melt adhesive can be extruded onto the membrane by using known apparatus such as adhesive coaters.
  • the adhesive can then subsequently be cured by using, for example, UV radiation.
  • the release film can be applied to the adhesive layer, and the membrane can then be subsequently rolled for storage and/or shipment.
  • the process can be supplemented with continuous techniques for applying and curing the adhesive coatings according to embodiments of the present invention to thereby prepare usable membrane composites within a single continuous process.
  • process 30 for preparing a composite membrane according to the present invention generally begins with a step of heating 32 , wherein a pressure-sensitive adhesive is heated to a sufficient temperature to allow the adhesive to be applied as a coating within a coating step 34 .
  • the adhesive is applied to the membrane to form a coating layer.
  • the coating is subjected to a UV-curing step 36 where sufficient UV energy is applied to the coating to thereby effect a desirable curing or crosslinking of the adhesive.
  • a release member can be applied to the cured coating in a member application step 38 .
  • the composite is wound into a roll at winding step 40 .
  • heating step 32 heats the adhesive to a temperature of from about 120 to about 160° C., in other embodiments from about 125 to about 155° C., and in other embodiments from about 130 to about 150° C.
  • coating step 34 applies an adhesive to the surface of a membrane to form a coating layer of adhesive that has a thickness of at least 51 ⁇ m (2 mil), in other embodiments at least 102 ⁇ m (4 mil), in other embodiments at least 127 ⁇ m (5 mil), and in other embodiments at least 152 ⁇ m (6 mil). In one or more embodiments, coating step 34 applies an adhesive to the surface of a membrane to form a coating layer of adhesive that has a thickness of from about 51 to about 381 ⁇ m (about 2 to about 15 mil), in other embodiments from about 102 to about 305 ⁇ m (about 4 to about 12 mil), and in other embodiments from about 127 to about 254 ⁇ m (about 5 to about 10 mil).
  • the coating has a uniform thickness such that the thickness of the coating at any given point on the surface of the membrane does not vary by more than 51 ⁇ m (2 mil), in other embodiments by more than 38 ⁇ m (1.5 mil), and in other embodiments by more than 25 ⁇ m (1 mil).
  • UV curing step 36 subjects the adhesive coating to a UV dosage of from about 30 to about 380 millijoule/cm 2 , in other embodiments from about 35 to about 300 millijoule/cm 2 , in other embodiments from about 40 to about 280 millijoule/cm 2 , in other embodiments from about 45 to about 240 millijoule/cm 2 , and in other embodiments from about 48 to about 235 millijoule/cm 2 .
  • the required dosage of energy can be exceeded without having a deleterious impact on the adhesives of the present invention. For example, up to ten times, in other embodiments up to five times, and in other embodiments up to three times the required dosage can be applied to the coating composition without having a deleterious impact on the coating composition and/or its use in the present invention.
  • UV curing step 36 subjects the adhesive coating to a UV intensity, which may also be referred to as UV irradiance, of at least 150, in other embodiments at least 200, and in other embodiments at least 250 milliWatts/cm 2 .
  • UV curing step 36 subjects the adhesive coating to a UV intensity of from about 150 to about 500 milliWatts/cm 2 , in other embodiments from about 200 to about 400 milliWatts/cm 2 , and in other embodiments from about 250 to about 350 milliWatts/cm 2 .
  • the energy supplied to the coating layer within UV radiation step 36 is in the form of UV-C electromagnetic radiation, which can be characterized by a wave length of from about 250 to about 260 nm.
  • the UV dosage applied during UV curing step 36 is regulated based upon a UV measuring and control system that operates in conjunction with UV curing step 36 . According to this system, UV measurements are taken proximate to the surface of the adhesive coating layer using known equipment such as a UV radiometer. The data from these measurements can be automatically inputted into a central processing system that can process the information relative to desired dosage and/or cure states and automatically send signal to various variable-control systems that can manipulate one or more process parameters.
  • the power supplied to the UV lamps and/or the height at which the UV lamps are positioned above the coating layer can be manipulated automatically based upon electronic signal from the central processing unit.
  • the UV intensity, and therefore the UV dosage can be adjusted in real time during the manufacturing process.
  • Continuous process 50 includes a heating step 52 where UV curable hot-melt adhesive 51 is heated to a desired temperature within a heated tank 53 .
  • Adhesive 51 is fed into an extrusion device, such as a coater 55 , which may include a pump, such as a gear pump 57 , and a slot die 59 .
  • coater 55 extrudes adhesive 51 , which is in its molten, liquid or flowable state, and deposits a coating layer 61 of adhesive 51 onto a planar surface 63 of membrane 65 .
  • coating step 54 can include a roll-coating operation, where adhesive 51 is applied to membrane 65 while membrane 65 is at least partially wound around a coating mandrel 67 .
  • Membrane 65 carrying coating layer 61 is fed to a crosslinking step 56 , where coating layer 61 of adhesive 51 is subjected to a desired dosage of UV radiation 69 , which may be supplied by one or more UV lamps 71 .
  • UV lamps 71 may include, for example, mercury-type UV lamps or LED UV lamps. As the skilled person appreciates, the desired dosage of UV energy can be supplied to coating 61 by adjusting the UV intensity and exposure time.
  • the intensity can be manipulated by the power supplied to the respective lamps and the height (H) that the lamps are placed above the surface of coating 61 of adhesive 51 .
  • Exposure time can be manipulated based upon the line speed (i.e., the speed at which membrane 65 carrying coating layer 61 is passed through UV curing step 56 ).
  • release paper 73 may be applied to upper surface 75 of coating layer 61 within release paper application step 58 .
  • release paper 73 may be supplied from a mandrel 77 and removably mated to upper surface 75 through pressure supplied by nip rolls 79 .
  • the composite product may be wound within winding step 60 to provide wound rolls 81 of composite products 83 .
  • the bond between the layer of crosslinked pressure-sensitive adhesive disposed on a surface of the membrane and the membrane of an existing membrane surface according to the present invention may be characterized by an advantageous peel strength.
  • the peel strength of the bond between the layer of crosslinked pressure-sensitive adhesive disposed on the membranes and the existing membrane may be characterized by a peel strength, as determined according to Pressure Sensitive Tape Council (PSTC) 101, of at least 3.0, in other embodiments at least 3.5, and in other embodiments at least 4.0 pounds per linear inch (pli).
  • PSTC Pressure Sensitive Tape Council
  • the peel strength may be from about 3.0 to about 25 in other embodiments from about 3.5 to about 20, and in other embodiments from about 4.0 to about 18 pli.
  • the bond between the layer of crosslinked pressure-sensitive adhesive disposed on a surface of the membrane and the existing membrane may be characterized by an advantageous dead load shear.
  • the dead load shear of the bond between the layer of crosslinked pressure-sensitive adhesive disposed on the membranes of the present invention and the existing membrane may be characterized by a dead load shear, as determined according to PSTC 107, of at least 0.5 hour (time of failure), in other embodiments at least 1.0 hour, and in other embodiments at least 1.5. In these or other embodiments, the dead load shear may be from about 2.0 to about 2.5 hours.
  • the method of reroofing includes providing the membrane composite, optionally preparing the roof surface, positioning the membrane composite over the roof surface, removing the release member, and mating the adhesive layer to the existing membrane.
  • the roof surface may be prepared by removing debris from the surface of the existing membrane. This may include using conventional means such as sweeping or blowing (e.g. with the use of power blower) to remove debris from the membrane surface. In addition thereto or in lieu thereof, water may be employed to assist in the removal of debris. This may include the use of a high-pressured water spray (e.g. power washer).
  • the existing membranes can be washed using cleaning products such as those available from Firestone Building Products, LLC under the tradename Membrane PreWash.
  • the membrane composites of the present invention can be secured to the existing roof membrane by using standard peel-and-stick techniques, which include positioning the membrane, removing the release member, and mating the adhesive layer to the roof surface (i.e. to the existing membrane).
  • practice of the present invention provides roof surface that includes an existing membrane secured to the roof deck, and a second membrane secured to the first membrane through the factory-applied adhesive layer described herein.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)
US16/088,176 2016-03-25 2017-03-25 Method of reroofing Abandoned US20200299967A1 (en)

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US201662313239P 2016-03-25 2016-03-25
US16/088,176 US20200299967A1 (en) 2016-03-25 2017-03-25 Method of reroofing
PCT/US2017/024192 WO2017165871A1 (fr) 2016-03-25 2017-03-25 Procédé de réfection de toit

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US18/311,040 Continuation US20230272619A1 (en) 2016-03-25 2023-05-02 Method of reroofing

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Publication number Priority date Publication date Assignee Title
EP3036099B2 (fr) 2013-09-18 2022-11-30 Holcim Technology Ltd Membranes de toiture à pelage et collage dotées d'adhésifs sensibles à la pression réticulés
CA2941239C (fr) 2014-03-07 2022-12-06 Firestone Building Products Co., LLC Revetement d'etancheite a adhesifs d'etancheite sensibles a la pression, durcis, pre-appliques
CA3018752C (fr) 2016-03-25 2022-06-07 Firestone Building Products Company, Llc Systeme de toit a adherence totale adherant et etant joint grace a un adhesif commun
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