Method for connecting an edge metal flashing to a roofing membrane

Abstract

A method for installing a cover strip between a roofing membrane and an edge metal flashing positioned over a portion of the roofing membrane, includes using a cover strip or a self-adhering cover strip to bridge a joint formed between the edge metal flashing and the roofing membrane. One end of the cover strip is indirectly or directly bonded to the edge metal flashing by using an adhesive whereas the other end is heat-welded or adhesively bonded to the roofing membrane.

1 .- 15 . (canceled) 
     
     
         16 . A method for installing a cover strip between an edge metal flashing and a roofing membrane, the method comprising steps of:
 i) providing a roof assembly comprising a roof substrate, an edge metal flashing, and a roofing membrane, wherein a portion of the roofing membrane is trapped between the edge metal flashing and the roof substrate,   ii) providing a sealing strip having upper and lower major surfaces limited between short and long edges,   iii) adhesively bonding the sealing strip via its lower major surface to a portion of an upper major surface of the edge metal flashing using a reactive adhesive,   iv) providing a cover strip having upper and lower major surfaces limited between short and long edges,   v) heat-welding a first long edge portion of the lower major surface of the cover strip to a portion of an upper major surface of the sealing strip and a second long edge portion of the lower major surface of the cover strip to a portion of an upper major surface of the roofing membrane,   
       or
 i′) providing a roof assembly comprising a roof substrate, an edge metal flashing, and a roofing membrane, wherein a portion of the roofing membrane is trapped between the edge metal flashing and the roof substrate, 
 ii′) providing a cover strip having upper and lower major surfaces limited between short and long edges, 
 iii′) adhesively bonding a first long edge portion of the lower major surface of the cover strip to a portion of an upper major surface of the edge metal flashing using a reactive adhesive, and 
 iv′) heat-welding a second long edge portion of the lower major surface of the cover strip to a portion of an upper major surface of the roofing membrane, 
 
       or
 I) providing a roof assembly comprising a roof substrate, an edge metal flashing, and a roofing membrane, wherein a portion of the roofing membrane is trapped between the edge metal flashing and the roof substrate, 
 II) providing a self-adhering cover strip comprising a carrier layer having upper and lower major surfaces limited by short and long edges and a layer of a pressure sensitive adhesive coated directly to and covering at least a portion of the lower major surface of the carrier layer, 
 III) positioning the self-adhering cover strip such that the adhesive layer covering a first long edge portion of the lower major surface of the carrier layer is directly connected to a portion of an upper major surface of the edge metal flashing and the adhesive layer covering a second long edge portion of the lower major surface of the carrier layer is directly connected to a portion of an upper major surface of the roofing membrane, 
 IV) pressing the carrier layer against the roof substrate to effect adhesive bonding between the opposing surfaces of the carrier layer and the edge metal flashing and between opposing surfaces of the carrier layer and the roofing membrane, and 
 V) optionally applying a sealant composition to at least one of the long and/or short edges of the carrier layer. 
 
     
     
         17 . The method according to  claim 16 , wherein the upper major surface of the edge metal flashing and/or the upper major surface of the roofing membrane is/are non-primed surface(s). 
     
     
         18 . The method according to  claim 16 , wherein step iii) comprises:
 iii1) applying the reactive adhesive to at least a portion of the lower major surface of the sealing strip and/or to a portion of the upper major surface of the edge metal flashing,   iii2) covering a portion of the upper major surface of the edge metal flashing with the sealing strip such that the applied reactive adhesive forms and interlayer between the edge metal flashing and the sealing strip, and   iii3) curing the reactive adhesive,
 or wherein step iii′). comprises: 
   iii′1) applying the reactive adhesive to at least a portion of the lower major surface of the cover strip and/or to a portion of the upper major surface of the edge metal flashing,   iii′2) covering a portion of the upper major surface of the edge metal flashing with the cover strip such that the applied reactive adhesive forms and interlayer between the edge metal flashing and the cover strip, and   iii′3) curing the reactive adhesive.   
     
     
         19 . The method according to  claim 16 , wherein the reactive adhesive is selected from one- and two-component epoxide, acrylic, and polyurethane adhesives. 
     
     
         20 . The method according to  claim 16 , wherein the pressure sensitive adhesive is an acrylic pressure sensitive adhesive. 
     
     
         21 . The method according to  claim 16 , wherein the sealing strip and/or the cover strip and/or the carrier layer of the self-adhering cover strip comprises at least one polymer P1 selected from polyvinylchloride, polyolefin, halogenated polyolefin, rubber, and ketone ethyl ester. 
     
     
         22 . The method according to  claim 21 , wherein the sealing strip and/or the cover strip and/or the carrier layer of the self-adhering cover strip comprises at least 25 wt.-% of the at least one polymer P1. 
     
     
         23 . The method according to  claim 16 , wherein the roofing membrane comprises at least one polymer P2 selected from polyvinylchloride, polyolefin, halogenated polyolefin, rubber, and ketone ethyl ester. 
     
     
         24 . The method according to  claim 23 , wherein the roofing membrane comprises at least 25 wt.-% of the at least one polymer P2. 
     
     
         25 . The method according to  claim 23 , wherein polymers P1 and P2 are selected from polyvinylchloride and polyolefin. 
     
     
         26 . The method according to  claim 16 , wherein the cover strip and/or the carrier layer of the self-adhering cover strip has a width of 10-100 cm. 
     
     
         27 . The method according to  claim 16 , wherein the first long edge portion of the lower major surface of the cover strip and/or the carrier layer of the self-adhering cover strip has a width of 2.5-35 cm. 
     
     
         28 . The method according to  claim 21 , wherein the edge metal flashing is a non-coated metal sheet or a coated metal sheet, wherein the coating comprises less than 2.5 wt.-% of the at least one polymer P1. 
     
     
         29 . A roof system comprising:
 i. a roof substrate,   ii. a roofing membrane covering at least a portion of an upper major surface of the roof substrate,   iii. an edge metal flashing, wherein a portion of the roofing membrane is trapped between the edge metal flashing and the roof substrate, and   iv. a cover strip or a self-adhering cover strip,
 wherein the roof system further comprises a sealing strip having upper and lower major surfaces limited between short and long edges, wherein the sealing strip is adhesively bonded via its lower major surface to a portion of an upper major surface of the edge metal flashing using a reactive adhesive and wherein the cover strip has upper and lower major surfaces limited between short and long edges and wherein a first long edge portion of the lower major surface of the cover strip is heat-welded to a portion of the upper major surface of the sealing strip and a second long edge portion of the lower major surface of the cover strip is heat-welded to a portion of an upper major surface of the roofing membrane, 
 or wherein the cover strip has upper and lower major surfaces limited between short and long edges and wherein a first long edge portion of the lower major surface of the cover strip is adhesively bonded via its lower major surface to a portion of an upper major surface of the edge metal flashing using a reactive adhesive and wherein a second long edge portion of the lower major surface of the cover strip is heat-welded to a portion of an upper major surface of the roofing membrane 
 or wherein the self-adhering cover strip comprises a carrier layer having upper and lower major surfaces limited by short and long edges and an adhesive layer of a pressure sensitive adhesive coated directly to and covering at least a portion of the lower major surface of the carrier layer and wherein a first long edge portion of the lower major surface of the carrier layer is bonded to a portion of an upper major surface of the metal edge flashing by the adhesive layer and a second long edge portion of the lower major surface of the carrier layer is bonded to a portion of an upper major surface of the roofing membrane by the adhesive layer. 
   
     
     
         30 . The roof system according to  claim 29  further comprising:
 a sealant composition covering at least one of the long and/or short edges of the carrier layer.