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This application claims the benefit of U.S. Provisional Application No. 61/704,746 filed Sep. 24, 2012, which is hereby incorporated by reference in its entirety as if fully set forth herein. 
    
    
     BACKGROUND OF THE INVENTION 
     Sealing around metal roof-penetrating pipes to prevent ingress of water and moisture presents problems. The metal pipes expand and contract with varied temperatures that a roof encounters. Ordinary seals and tars under stress over time periods, crack, become loose, and admit water and moisture to penetrate roofs around the through-roof pipes. Over time metal pipe surfaces exposed to the elements become corroded or oxidized and become extremely difficult or totally impossible to seal. Replacement of these damaged or impossible to seal preexisting metal pipes is costly and time-consuming. Hence sealing to these preexisting old corroded metal pipes presents a problem to be solved. 
     Roof-penetrating metal pipes have different diameters and thicknesses. As an example, cast iron pipes may have larger outer diameters and greater wall thickness as compared to smaller outer diameters and thinner walls of copper roof-penetrating pipes. This pipe size difference creates other problems to be solved. 
     Needs exist for improved roof-penetrating pipe seals and sealing. 
     SUMMARY OF THE INVENTION 
     The present invention provides a solution to the problem by covering the roof-penetrating metal, or other, pipe with a cover sleeve apparatus comprising a section of PVC (polyvinyl chloride) pipe and a connecting cap. The cover sleeve apparatus extends over and along the metal or other pipe into and through the roof flashing device seal portion and sometimes into the opening around the pipe in the roof substrate. 
     A roof flashing device comprising a flexible silicone boot, a base plate and a rigid compression ring seal is disclosed in U.S. patent application Ser. No. 12/803,176 filed Jun. 21, 2010, now U.S. Pat. No. 8,484,914, which is incorporated herein by reference as if fully disclosed herein. The rigid compression ring is trapped between enlarged beads near the top of the sealing boot. The body of the sealing boot is flexible and has one or more expanded bulges to provide flexibility and to allow the seal to be mounted on roofs of varied slopes. The base of the silicone sealing boot has an outer sealing edge and an inner dependent bead. 
     The mounting plate attaches to the inner depending bead of the sealing boot. The mounting plate has a flat peripheral portion to overlie and underlie successive ranks applied roofing material. 
     An integral oval raised middle portion of the mounting plate is formed upwards from the flat surface. The middle portion tapers from a larger height above the flat peripheral portion at the down-roof side to a smaller height at the up-roof side. An upper ledge of the middle portion is formed inward to lie beneath the lower sealing edge of the silicone sealing boot. An inner part of the upper ledge is reentrantly curved downward and then upward in an S-shaped cross-section to lock in the inner dependent bead of silicone sealing boot. The inner edge of the S-shaped cross section is directed downward, away from the boot. 
     The upper beads of the sealing boot trap the rigid compression ring. The upper beads tightly fit around and are slightly stretched over the PVC pipe. The sealing sleeve is pressed down along the PVC pipe during installation. A silicone lubricant is distributed around the top of the PVC pipe and/or inside the upper beaded portion of the silicone sealing boot before the sealing boot assembly is pressed downward along the PVC pipe and cap. 
     The rigid compression ring is placed between the upper and lower silicone retaining beads before the sealing assembly is shipped from the factory. The rigid compression ring remains in place between the two retaining beads as the silicone sealing boot is pressed downward along the PVC pipe and cap. The rigid compression ring has similar characteristics of expansion as the cover sleeve apparatus and retains the desired compression of the silicone sealing boot around the cover sleeve apparatus under all conditions. The cover sleeve apparatus surrounding and encasing the metal pipe solves any problems of further deterioration or damage to the metal pipe. 
     During fabrication and manufacturing of the cover sleeve apparatus, the connecting cap is permanently sealed to the one end of the PVC pipe section. Outer edges of the connecting cap are flush with the outer surface of the PVC pipe section. To solve the problems of varied metal pipe size and outer dimensions and wall thicknesses, the connecting cap has inner features. The connecting cap has a central opening that provides the intended venting of the preexisting roof-penetrating pipes. The connecting cap has a long downward inner cylindrical extension that fits within upper ends of preexisting roof-penetrating pipes. The cylindrical downward inner extensions are slightly outwardly tapered to thinner inwards ends spaced inward from the inner walls of the preexisting pipes. The tapering and spacing helps to ensure that rain water or moisture drops straight down into and through the preexisting vent-pipes and also helps to center and locate the cover sleeve apparatus on the preexisting vent pipes. 
     The thick sloping inner shelf of the connecting cap rests on top of the preexisting pipe, and an inner edge of the shelf is rounded inward from the top of the preexisting vent pipe. The thick shelf has a wide inner part bounded on an outer-side by a long downward tapered cylindrical extension that divides the lower surface of the shelf into a wider inner annular surface and a smaller outer annular surface. The wider inner surface is especially suited for a smaller outer dimension and a thicker wall of a cast iron pipe. The smaller outer annular surface is suited for supporting on top of a copper pipe. 
     The shelf has an outer wall that fits tightly against an inner wall of the cylindrical PVC pipe section. A radially extending rim of the connecting cap fits over the upper end of the PVC pipe section. The outer diameter of the rim is coextensive with the outer diameter of the PVC pipe section. Raised reinforcements extend between the upper surface of the shelf and the inner surface of the outer wall of the connecting cap to ensure dimensional stability of the connecting cap and the upper end of the PVC pipe section. The connecting cap is inseparably assembled on the top of the PVC pipe section at the factory by one or more of bonding, welding, fusing, or pressure fitting. 
     A roof-penetrating pipe seal includes the cover sleeve apparatus, also called herein a sealing pipe, for placing over a roof-penetrating pipe. The connection cap portion of the cover sleeve apparatus connects the sealing pipe, also called herein a cover sleeve apparatus, with the roof-penetrating pipe. The connection cap has an inner part fitting into the roof-penetrating pipe and a part extending from the roof-penetrating pipe. A roof flashing sealing boot fits over the cover sleeve apparatus. The roof flashing sealing boot has an upper portion tightly engaging and sealing the cover sleeve apparatus and having a lower flexible portion. The upper portion is adapted for sliding downward along the cover sleeve apparatus. A base has a lower portion for connecting to a roof. An upper portion of the base is connected and sealed. 
     The connection between the roof-penetrating pipe and the cover sleeve is the annular connection cap which is fitted over the top of the roof-penetrating pipe that supports the inner part that fits into the roof-penetrating pipe. The connecting cap has an upward extension and an outward extension for a permanent connection with the cover sleeve apparatus. 
     The upward extension has an outward extending and downward facing rim for joining the connecting cap to an upper end of the pipe section of the cover sleeve apparatus. 
     The connecting cap extends outward and upward, forming an annular cup with a central opening directing precipitation into the roof-penetrating pipe. 
     The connecting cap has an outer annular part extending downward along an outer wall of the roof-penetrating pipe. The inner part and the outer part of the connecting cap are tapered for aligning the cover sleeve apparatus on the roof-penetrating pipe. 
     A compression ring compresses the upper portion of the sealing boot on the cover sleeve apparatus. The upper position of the boot has spaced upper and lower outward projections trapping and holding the compression ring between the projections. The boot and the upper portion of the boot slide downward along the cover sleeve apparatus. The compression ring and the cover sleeve apparatus are made of the same material and have the same thermal coefficient of expansion. The upper portion of the boot has an inner dimension which is less than an outer dimension of the cover sleeve apparatus. The compression ring compresses a part of the upper portion of the boot between the compression ring and the cover sleeve apparatus. 
     Sealing a roof penetrating pipe includes placing a cover sleeve apparatus over the roof-penetrating pipe, connecting the cover sleeve apparatus to the roof-penetrating pipe and extending a part of the cover sleeve apparatus into the roof-penetrating pipe. A sealing boot is fitted over the cover sleeve apparatus, tightly engaging an upper portion of the sealing boot on an outside of the cover sleeve apparatus. A lower portion of the sealing boot is sealed to a base. The base is secured to the roof around the roof-penetrating pipe and the cover sleeve apparatus. 
     The method includes providing a connecting cap on the cover sleeve apparatus, providing an annular horizontal part of the connecting cap, providing an inner downward extension on the horizontal part, and fitting the inner downward extension into the roof-penetrating pipe. 
     An outer downward extension on the horizontal part is fitted on an outside of the roof-penetrating pipe. 
     An upward extension on an outer edge of the horizontal part provides an outward extending and downward facing rim. The rim is permanently sealed to an upper edge of the cylindrical pipe portion of the cover sleeve apparatus. 
     A cover sleeve apparatus is placed over a roof-penetrating pipe. An annular connecting cap is permanently joined on a top of the cylindrical pipe portion. The annular connecting cap has an annular inward extending part and an inner downward extension on an inner edge of the annular inward extending part fitting inside of a roof-penetrating pipe. 
     A sealing boot having an upper portion and a base portion tightly engages and seals the cover sleeve apparatus. 
     The upper portion is adapted for sliding downward along the outside diameter of the cover sleeve apparatus. 
     The base portion has an outwardly extending flange for connecting to a roof. A lower portion of the boot and an upper portion of the base are interconnected and sealed. Reinforcements connect to the annular inward extending part and the upward extending part. 
     These and further and other objects and features of the invention are apparent in the disclosure, which includes the above and ongoing written specification, with the claims and the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a through-roof seal assembly for a cast iron, copper or other roof-penetrating pipe. 
         FIG. 2  is a cross-sectional perspective detail of the seal assembly shown in  FIG. 1  used on a cast iron pipe that penetrates a roof. 
         FIG. 3  is a cross-sectional perspective detail of the seal assembly shown in  FIGS. 1 and 2  showing a detail of the connecting cap on the upper end of the seal assembly and the cast iron pipe. 
         FIG. 4  is a cross-sectional perspective detail of the seal assembly shown in  FIG. 1  used on a copper pipe that penetrates a roof. 
         FIG. 5  is a cross-sectional perspective detail of the seal assembly shown in  FIGS. 1 and 4  showing the upper end and cap of the seal assembly and the copper pipe. 
         FIG. 6  is an exploded perspective view of the cover sleeve apparatus used to cover the cast iron or copper pipe shown in  FIGS. 1-5 . 
         FIG. 7  is an assembled view of the cover sleeve apparatus used to cover the cast iron or copper pipe in the seal assembly shown in  FIGS. 1-5 . 
         FIG. 8  is an enlarged cross-sectional top perspective detail of the cover sleeve apparatus shown in  FIGS. 1-7 . 
         FIG. 9  is an enlarged cross-sectional bottom perspective detail of the cover sleeve apparatus shown in  FIGS. 1-8 . 
         FIG. 10  is a perspective view of covering a roof having a cast iron, copper or other roof-penetrating vent pipe. 
         FIG. 11  is an exploded perspective view of a cover sleeve apparatus ready for placing on and surrounding the roof-penetrating cast iron or copper pipe. 
         FIG. 12  shows the cover sleeve apparatus covering the cast iron or copper pipe with a lower end of the cover sleeve apparatus penetrating the roof. 
         FIG. 13  shows a silicone seal and mounting plate ready to slide over the cover sleeve apparatus. 
         FIG. 14  shows the silicone seal and mounting plate in place sealing the cover sleeve apparatus. 
         FIG. 15  shows the installation of roofing material over the base plate and around the silicone roof flashing seal. 
     
    
    
     DETAILED DESCRIPTION 
     In overall operation, the roof-penetration pipe sealing system comprising the cover sleeve apparatus of the present invention serves as a cover for the roof-penetrating element as well as providing a long-term, durable and reliable seal between the roof-penetrating element, the roof substrate and roof covering material. As shown in  FIG. 1  the cover sleeve apparatus  224  has two main components: a cylindrical PVC pipe section  200  and a connecting cap  210 . The roof seal apparatus  100  has three main components. A rigid base plate element  10  is the point of attachment to the roof substrate around the object to be sealed. A flexible transition member  50  is affixed to the base plate element in an inseparable manner and provides the seal to the roof-penetrating element. A rigid compression element  90  is positioned outside of the flexible transition element and is sized to constrain a uniform portion of the flexible transition element between the rigid compression element  90  and the PVC pipe section  200  of cover sleeve apparatus  224  covering the roof-penetrating object. The structures, the choice of materials used, the construction of the interfaces between the materials and the method of assembling the materials into the final cover sleeve apparatus, all combine to provide the unique attributes and performance of the new system. 
       FIGS. 1-15  portray the roof-penetrating pipe sealing at various stages.  FIG. 1  shows a close up of the whole assembly including the cover sleeve apparatus  224  over a vent pipe in the roof  112  with the silicone sealing transition member  50  and rigid compression ring  90  on a metal mounting plate  10 . This is but one of numerous embodiments in which the sealing system may be realized in accordance with the present invention. 
       FIGS. 2 and 3  shows cross-sections of the cover sleeve apparatus  224  over a cast iron pipe  230 .  FIG. 2  shows how the transition element  50  is held in place around the cylindrical PVC pipe section  200  by the rigid compression ring  90 . The silicone sealing boot transition member  50  is inseparably attached to the mounting plate  10 . As manufactured, an inner diameter of the upper seal portion  51  of flexible transition element  50  is formed slightly smaller than the cylindrical PVC pipe section  200  outside diameter, such that the seal portion  51  of the flexible transition element must stretch some small percentage as it is installed. Flexible transition element  50  is manufactured from a resilient elastomeric material such as silicone and is manufactured using a compression molding process that insures homogenous material properties throughout the molded part. The upper seal portion  51  of the flexible transition element  50  has two enlarged compression features, an upper stretch bead  52  and lower stretch bead  56 . A factory-installed rigid compression ring  90  is trapped between enlarged beads  52 ,  56 . 
     In effect, as the flexible transition element  50  is installed over the PVC pipe section  200 , the inner surface of the sealing portion  51  of the elastomeric material stretches to fit the PVC pipe section  200  outside circumference. The sealing portion  51  and the enlarged beads  52  and  56  are slightly stretched over the PVC pipe section  200  and the effective outside diameter in the stretched area of flexible transition element seal portion  51  grows to a larger outer diameter. This outer diameter growth is not linear due to the reduction in cross-section caused by the stretching of the material. This new larger effective outer diameter of the seal portion of the flexible transition element  50  is restrained by rigid compression element  90 , whose internal diameter is slightly smaller than the larger effective outer diameter in the uniform wall portion, thereby creating a compressive force or squeeze, on the flexible transition element  50  in the uniform wall portion at  51  between the rigid compression ring  90  and the PVC pipe section  200  of the cover sleeve apparatus  224 . 
     The rigid compression element  90  is formed of a material with similar mechanical properties to the PVC pipe section  200 . The material used in the rigid compression element  90  exhibits a similar coefficient of thermal expansion as the PVC pipe section  200 . As the PVC pipe section  200  is changing dimension due to thermal changes, the rigid compression element  90  experiences the same thermal changes and changes dimension in a similar magnitude and at a similar rate as the pipe. By matching the thermal coefficient of expansion for both parts, the PVC pipe section  200  and the rigid compression element  90 , uniform squeezing or compressive forces are applied to the sealing portion  51  of the flexible transition element  50 . The magnitude of the compressive stress within the resilient material remains as uniform as possible throughout thermal gradients which occur on a daily cycle. 
     In addition, rigid compression element  90  serves to fully shield the uniform wall portion between stretch beads  52  and  56  from all sunlight UV exposure and from the elements. Lower stretch bead  56  is also partially protected from sunlight UV exposure and atmospheric elements by rigid compression element  90 . The outside diameter and geometry of rigid compression element  90  is determined such that it provides adequate resistance to the compressive resultant forces from the flexible transition element  50  but is not so large diameter that it could become a damaging element under a snow or ice load. The best embodiment for rigid compression element  90  is as shown a single piece formed ring like structure; ideally manufactured from an injection molding grade of thermoplastic, more specifically rigid PVC. 
     The roof flashing sealing apparatus  100 , also called a boot or flashing, as it is manufactured and shipped to the roof contractor or distributor has the sealing boot  50  inseparably attached to the mounting plate  10 . The body of the sealing boot  50  is flexible with one or more bulges  60  to help to provide that flexibility such that the seal can fit on roofs  112  of varied slopes. At the base of the silicone sealing boot  50  is an outer sealing edge  62  and an inner dependent bead  70 . Base plate  10  is die-stamped or roller formed of a rigid material capable of both being permanently affixed to the flexible transition element  50  and capable of being integrated under and within a roof covering material with ease. A galvanized and coated steel sheet of suitable alloys and plastic materials function well for this part. The base plate  10  is formed to accommodate the assembly to the flexible transition boot element  50 , and boot  50  is formed to facilitate and at least partially accommodate variations in roof structure pitch that are encountered at installation. 
     The raised middle portion  14  of the base plate is tapered and from a larger height at the down-roof side to a smaller height at the up-roof side. The raised oval portion  14  of the mounting base  10  connects to the silicone sealing boot  50  by the inner dependent bead  70 . An inner portion of the uppermost ledge part of the metal mounting plate  10  is reentrantly curved downward and then upward in an S shaped cross-section lock portion  22  to lock into the inner dependent bead  70  of the silicone boot  50 . Base plate  10  has the portion  22  formed to receive match and mate with the bead  70  on the underside of the flexible transition element  50 . Crimping the lock portion around bead  70  irreversibly locks the boot  50  to the plate  10 . The inner edge of the lock portion  22  is turned downward so as not to touch the boot  50 . Some installations, such as those with particularly harsh environmental extremes, may require an added level of protection, and as such an adhesive, bond, sealant, caulk compound or the like can be applied between top surface  14  receiver portion  22  and bead  70 . The oval surface  14  is larger than the corresponding portion of the boot  50 , leaving a small peripheral portion of top surface ledge exposed. The inner edge of the lock portion  22  is turned downward so as not to touch the boot  50 . This slight set-back of the elastomer portion from the rigid base plate sloping surface  14  helps to prevent separation of the flexible transition element  50  from the base plate  10  due to ice intrusion. 
     The bead of elastomeric material  70  is trapped and squeezed by the plate&#39;s ledge surface receiver  22 . The receiver  22  is crimped or rolled and deformed into bead-capturing position. For a base plate  10  made from a steel or other metal alloy this forming operation is commonly called a crimp or sizing operation moving the metal feature past its elastic limit to form a permanent new feature. Should the base plate be made from a plastic or other non-ferrous material, a heat operation can be utilized to form the material and then re-freeze the material to a new permanent shape. 
     In another embodiment, the flexible transition element  50  could be formed to the base plate  10  as part of the molding process, commonly known as over-molding, two shot or insert-molding. In this embodiment, no crimp or form operation would be required. The moldable resilient material used for the flexible transition element would be molded directly to the base plate part  10 , requiring no further assembly processes to create the inseparable assembly. 
       FIG. 3  is an enlargement of the cross-section at the connecting cap  210  of the cover sleeve apparatus  224 . The cast iron pipe  230 , which may have smaller outer diameters and greater wall thickness, fits snugly into the connecting cap  210 . The cast iron pipe  230  fits in between the long downward tapered cylindrical extension  222  and the short downward tapered cylindrical extension  220 . Spacers  217  molded into and spaced along the wider inner surface  216  of the connecting cap  210  rest on the top of the pipe  230  made of metal or other material. The long downward tapered cylindrical inner extension  222  forms a central opening  212  in the cap  210  that allows gas to exit and rain water to enter the pipe  230 . 
       FIGS. 4 and 5  show cross-sections of the cover sleeve apparatus  224  over a copper pipe  240 . Despite the differences in material, size and thickness of pipe  240 , the cover sleeve apparatus  224  covers and protects the copper pipe in the same way as the cast iron pipe. 
       FIG. 5  is an enlargement of the cross-section of the connecting cap  210  connected to the upper end of the PVC pipe section  200 . The copper pipe  240 , which may have a different outer diameter and thinner walls than a cast iron pipe fits snugly into the connecting cap  210  even though this is the same connecting cap that fits over the previously illustrated cast iron pipe  230 . The copper pipe  240  fits between the short downward tapered cylindrical extension  220  and the inside of the PVC pipe section  200 . The smaller outward-positioned inner surface  218  of the connecting cap  210  rests on the top end surface of the copper pipe  240 . The long downward tapered cylindrical extension  222  forms a central opening  212  in the connecting cap  210  that allows gas to exit and rain water to enter the copper pipe  240 . 
       FIGS. 6 and 7  show the cover sleeve apparatus  224  in detail.  FIG. 6  shows an exploded view of the cover sleeve apparatus  224  prior to assembly. The connecting cap  210  is assembled on the top end of the cylindrical PVC pipe section  200  at the factory by one or more of bonding, welding, fussing, or pressure fitting.  FIG. 7  shows cover sleeve apparatus  224  as manufactured and ready for use as a cover for a preexisting vent pipe. The central opening  212  in the cap  210  allows gas to exit and rain water to enter the preexisting pipe. 
       FIGS. 8 and 9  show details of the cover sleeve apparatus  224 , pipe section  200  and connecting cap  210  from different perspectives. A lower outer vertical wall surface  228  of connecting cap  210  is slightly larger in diameter than the inner wall  201  of the cylindrical PVC pipe section  200  providing a slight interfering fit when assembled. Above the outer vertical wall surface  228  a rim  226  extends to the outer diameter of the PVC pipe section  200 . An annular outer cap surface  227  with a semi-circular cross section extends upward and inward from an outer edge of rim  226  to a cylindrical vertical wall  229 . The annular flat surface  232  of connecting cap  210  extends from the central opening  212  to the vertical wall  229 , which is opposite the outer vertical surface  228  of the connecting cap  210 . Reinforcements  214  extend between the upper surface  232  and the inner surface  229  of the outer wall of the cap  210  that makes to ensure dimensional stability of the connecting cap  210  and the upper end of the PVC pipe section  200 . Reinforcements  214  also assist in preventing accidental blockages of the vent opening  212  by random leaves, birds or debris. Rigidifying spacers  217  extend between the lower surface  216  of the shelf  232  and the short and long downward tapered cylindrical extensions  220  and  222  of the connecting cap  210 . Reinforcements  214  also serve as torsion members during assembly of the connecting cap  210  to the pipe section  200 , either during solvent welding operation or spin welding operations the connecting cap  210  must be rotated relative to the pipe section  200  and reinforcement  214  allow for proper holding to accomplish the relative rotation operations. 
       FIGS. 10-15  show the entire assembly process.  FIG. 10  shows the roof  112  with roofing material layers  250  and the vent pipe  110  rising through the opening in the roof  114 . An opening  252  is cut in the layers. 
       FIGS. 11 and 12  show how the cover sleeve apparatus  224  is installed and fits over the vent pipe  110 . PVC pipe section  200  passes through the opening  114  in the roof  112 , however in given situations the end of the PVC pipe section  200  would not always need to pass through the roof substrate  112 . As long as the terminal end of the PVC pipe section  200  is below the sealing portion of the roof flashing  100  the system performs to seal the roof penetration. 
     Referring to  FIGS. 13 and 14 , roof-penetrating pipe  110  extends through a hole  114  in the roof substrate  112 . The exterior surface of the cover sleeve apparatus  224  is wiped with a factory-supplied towelette impregnated with silicone oil and roof flashing  100  is installed over the cover sleeve apparatus  224  and is pushed downward along pipe section  200  onto roof substrate  112  and upper layer  254  of the roof covering layers. The plate  10  is then nailed to the roof substrate  112  though preformed holes in the plate. 
     To facilitate installation on a pipe and to help insure longevity of the flexible transition element  50  a lubricant may be added to the inner surface the upper portion  51  of the boot  50  of the sealing portion prior to installation onto the cover sleeve apparatus  224 . This lubricant may be added to the system in the factory as part of the manufacturing process or it may be added in the field just prior to installation 
     The geometric oval structure, bulbous portion  60  and elastomeric properties of flexible seal boot element  50  allows the sealing system roof flashing  100  to be applied to roof structures of varying pitch from a flat roof to a steeply sloped roof. 
     The factory-installed rigid compression ring  90  remains in place between the two retaining beads  52  and  56  as the silicone sealing boot  50  is pressed downward along the cover sleeve  224 . The rigid compression ring  90  has similar characteristics of expansion to the PVC pipe section  200  and retains the desired compression of the silicone around the PVC pipe section  200  under all conditions. The cover sleeve apparatus  224  surrounds and encases the preexisting pipe and solve any problems of deterioration or damage to or leakage around the preexisting pipe. 
       FIG. 15  shows the final assembly with complete roofing materials. The flat peripheral portion of the base plate  10  is made to overlie and underlie successive ranks of applied roofing material  250 . 
     While the invention has been described with reference to specific embodiments, modifications and variations of the invention may be constructed without departing from the scope of the invention, which is defined in the following claims.

Summary:
A roof-penetrating pipe is covered with a sealing pipe. An annular part overlies the roof-penetrating pipe and a downward extension fits into the roof-penetrating pipe to center the sealing pipe. A flexible seal has an upper part tightly gripping the sealing pipe. A compression ring compresses the upper part against the sealing pipe. The flexible seal is slid downward on the sealing pipe. A base on the flexible seal is secured to the roof. A roof penetrating pipe which is difficult to seal or which cannot be sealed due to corrosion, breakage or oxidation is covered with a cover sleeve apparatus. The cover sleeve provides a smooth sealing surface for application of a standard roof pipe flashing device. The cover sleeve is manufactured from materials to withstand the elements and to meet industry standard sizing.