Method of securing roofing membrane using lightly adhesive release layer positioned between hook and loop fasteners

Abstract

A hook and loop system for attaching a roofing membrane into the top of a building insulation board including a roofing membrane with a fleece backing having a release sheet on the fleece backing. The release sheet is manually removed in the field to attach the fleece backing directly onto a layer of hooks that have been pre-attached onto the top of the insulation board. The release layer may be somewhat sticky, yet not adhere too tightly to the fleece layer such that its removal does not damage the fleece backing. The release layer may also be pre-rolled together with the fleece backed roofing membrane and shipped together as a unit into the field.

Claims

1. A method of securing a roofing membrane onto a roof, comprising: placing a roll of rolled up roofing membrane assembly onto a roof having a roofing substrate covered with a hook layer, the roll of roofing membrane assembly comprising: a roofing membrane, a loop layer attached to the underside of the roofing membrane, and a lightly adhesive release layer positioned against the underside of the loop layer; unrolling the roll of rolled up roofing membrane assembly on top of the hook layer; folding a first portion of the unrolled roofing membrane assembly back over on top of a second portion of the roofing membrane assembly, thereby exposing a first portion of the lightly adhesive release layer underneath the first portion of the loop layer of the roofing membrane assembly; removing the first portion of the lightly adhesive release layer, thereby exposing a first portion of the loop layer underneath the first portion of the loop layer of the roofing membrane assembly; placing the exposed first portion of the loop layer down onto the hook layer to thereby secure the first portion of the roofing membrane assembly onto the hook layer on the roofing substrate; and then, folding a second portion of the unrolled roofing membrane assembly back over on top of the secured first portion of the roof member assembly, thereby exposing a second portion of the lightly adhesive release layer underneath the loop layer of the second portion of the roofing membrane assembly; removing the second portion of the lightly adhesive release layer, thereby exposing a second portion of the loop layer underneath the second portion of the roofing membrane assembly; placing the exposed second portion of the loop layer down onto the hook layer to thereby secure the second portion of the roof member assembly onto the hook layer on the roofing substrate, wherein the first and second portions of the lightly adhesive release layer are positioned in parallel to one another such that a line or perforation separating the first and second portions of the lightly adhesive release layer runs perpendicular to an axis about which the roll is unwound, wherein the lightly adhesive release layer wraps around the loop layer such that the lightly adhesive release layer is bottom facing when the roll is unwound, and wherein the lightly adhesive release layer has a peel adhesion between 0.02 and 0.05 lbf/in.

2. The method of claim 1, further comprising: applying pressure with a mechanical roller on top of the roofing membrane assembly, thereby securing the loop layer on the roofing membrane to the hook layer on the roofing substrate.

3. The method of claim 1, wherein removing the lightly adhesive release layer comprises manually pulling off the lightly adhesive release layer without damaging the loop layer on the roofing membrane.

4. The method of claim 1, wherein removing the release layer is done by separating the first and second portions of the release layer along a perforation in the release layer.

5. The method of claim 1, wherein the roofing membrane is made of EPDM, TPO, PVC or waterproofing material.

6. The method of claim 1, wherein the lightly-adhesive release layer is plastic, paper or laminated film with an adhesive coating.

7. The method of claim 1, wherein only a portion of the surface of the lightly adhesive release layer has adhesive applied thereto.

8. The method of claim 1, wherein the first and second portions of the lightly adhesive release layer have overlapping edges.

9. The method of claim 1, wherein the first portion of the roofing membrane assembly is secured onto the hook layer before the second portion of the lightly adhesive release layer has been removed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a sectional elevation view of the various layers of the present roofing system.

(2) FIGS. 2A to 2D are sequential illustrations of a rolled up unit of the present system being applied on top of roofing insulation boards in the field, as follows.

(3) FIG. 2A shows a roll of the present roofing material with release layer as delivered into the field for installation on top of a building roof.

(4) FIG. 2B shows a portion of the roll of roofing material being unrolled onto the roof surface.

(5) FIG. 2C shows the roll of roofing material fully unrolled onto the roof surface.

(6) FIG. 2D shows half of the roofing material being flipped over to manually remove the quick release layer.

(7) FIG. 2E is a sectional elevation view corresponding to FIG. 2D.

(8) FIG. 3 illustrates a release layer having overlapping edges.

DETAILED DESCRIPTION OF THE DRAWINGS

(9) FIG. 1 illustrates a sectional elevation view of the various layers of the present roofing system 10 as follows.

(10) First, an insulation assembly 20 is provided on top of the building roof Insulation assembly 20 comprises a bottom board, preferably an insulation board 22 with a hook 24 layer attached thereon. A roof member assembly 40 is also provided. Roof member assembly 40 preferably comprises: a roofing membrane 42, a fleece layer 44 attached to the underside of roofing membrane 42, and a release layer 46 preferably adhesively attached to the underside of fleece layer 44.

(11) The release layer 46 prevents contact between the fleece layer 44 (on the underside of the roofing membrane 42) and the hook layer 24 (on the top of the insulation board 22) before the roofing membrane 42 has been properly positioned on the roof. This allows easy sliding and positioning of the roll on top of the insulation board. Release layer 46 thereby makes the installation much more “application friendly” particularly in windy conditions and when placement around roof penetrations where cutting and fitting is required.

(12) In optional preferred aspects, hook layer 24 and fleece layer 44 can be standard hook and loop (e.g.: Velcro®) layers of fastening. It is to be understood, however, that other hook and loop fastening systems can be used as well.

(13) In various preferred aspects, release layer 46 is somewhat sticky such that it can be manually pulled off of fleece layer 44 in the field without damaging the fleece layer.

(14) Specifically, the release layer 46 is coated with a very thin layer of adhesive that adheres adequately to the fleece in cold installation temperatures without adhering too much in high installation temperatures. As a result, release layer 46 does not distort or separate the fleece fibers from the fleece layer, yet still has enough adhesion to stay with the fleece until release layer 46 is manually separated in the field.

(15) Optionally, release layer 46 is only partially adhered to the underside of fleece layer 44. For example, only a portion of the total surface area of release layer 46 may have adhesive applied thereto. This portion of adhered surface may preferably be anywhere from 10% to 100% of the total surface area. In various alternate aspects, the adhesive may be applied to release layer 46 in a multitude of different adhesion patterns. Such patterns can include (but are not limited to) alternating adhered and non-adhered strips or sections, diamond or checkerboard patterns of adhesive application, or even random adhesion patterns (e.g.: splattering), all keeping within the scope of the present invention). The advantage of these approaches are that less adhesive will be used.

(16) Preferably, release layer 46 is a plastic film with an adhesive coating, and the adhesive is made out of acrylic copolymer. Preferable 180 degree peel values for release layer 46 can be on the order of between 0.02 and 0.05 lbf/in. The present inventors have experimentally determined that should the peel value drop below 0.02 lbf/in, the release layer tends to fall off the fleece prematurely. Conversely, for peel values above 0.05 lbf/in, the release layer begins to pull filaments from the fleece. It is to be understood, however, that the use of an acrylic copolymer is only exemplary and that any suitable adhesive could be used instead. Examples of such substitutes can include, but not be limited to styrene block copolymer, silicone, polyisobutylene, vinyl acetate ethylene (VAE), polyurethane or rubber based adhesives. In addition, the adhesive used could include solvent based, water-borne, hot melt or reactive adhesives

(17) In other preferred aspects, release layer 46 is a flexible sheet of material that is rolled up together with the roofing membrane 42 and fleece layer 44 and delivered to the jobsite as a unit. This aspect of the present system is illustrated in FIGS. 2A to 2E, as follows.

(18) FIG. 2A shows a roll 100 of the present roofing material with release layer 46 as delivered into the field for installation on top of a building roof. Specifically, roll 100 simply corresponds to roof member assembly 40 illustrated in FIG. 1, but is instead delivered wound up in a roll. Next, FIG. 2B shows a portion of roll 100 being unrolled onto the roof surface. The building roof surface is illustrated as insulation board 22 covered by hook layer 24 (from FIG. 1). As the installers progress, FIG. 2C then shows roll 100 after it has been fully unrolled onto the roof surface. Next, since release layer 46 is positioned at the bottom of the unrolled roof member assembly 40, the installers have to remove release layer 46 such that fleece layer 44 can be attached to hook layer 24. This may be done as illustrated in FIGS. 2D and 2E where the installers fold half of roof member assembly 40 back over on top of itself, and then remove release layer 46. In this illustrated approach, release layer 46 can actually comprise two separate release layers (46A and 46B) positioned side-by-side one another (or optionally formed of the same sheet of materials but separated by a perforation 47 as shown in FIG. 2E), such that they can be peeled back and removed one by one. After the illustrated side of release layer 46A has been manually removed, fleece layer 44A is then attached to hook layer 24, then roof member assembly 40 can be flipped over on its opposite side, thereby exposing release layer 46B. Next, the release layer 46B can be manually removed such that fleece layer 44B can then be attached down onto fleece hook layer 24, thereby completing the installation. Optionally, mechanical rollers can be used to apply pressure over the top of roofing membrane 42, thereby further securing fleece layer 44 to hook layer 24.

(19) FIG. 3 illustrates a release layer 46 having overlapping edges. In this embodiment, a user lifts and peels back edge 49 to begin pulling release layer 46 away from fleece layer 44 (shown below).

(20) In preferred aspects, roofing membrane 42 can be made of EPDM, TPO or PVC. However, the present system is not so limited and other roofing materials can be used as well.

(21) In further optional aspects of the present system, an optional adhesive layer can be applied between fleece layer 44 and hook layer 24 after release layer 46 has been removed.

(22) In its various aspects described above, the present system provides: (1) a release layer that is rolled up with the roofing membrane where the release layer can be either sticky or not sticky at all; and (2) a sticky release layer that may or may not be rolled up together with the roofing membrane prior to delivery at a jobsite.