Peel-and-stick roofing membranes and methods for forming fully-adhered roofing systems

1. A method of installing a roof system, the method comprising:

(i) providing a first membrane composite including a polymeric planar body having first and second planar surfaces, where the polymeric planar body is a cured rubber membrane, a UV-cured pressure-sensitive adhesive layer disposed on the second planar surface, where the UV-cured pressure-sensitive adhesive layer includes a UV-cured acrylic resin, a release member removably secured to the pressure-sensitive adhesive layer opposite the polymeric planar body, and a pre-applied primer layer disposed along a lap area on the first planar surface;

(ii) adhesively securing the first membrane composite to a roof surface through the UV-cured pressure-sensitive adhesive layer;

(iii) providing a second membrane composite including a polymeric planar body having first and second planar surfaces, where the polymeric planar body is a cured rubber membrane, a UV-cured pressure-sensitive adhesive layer disposed on the second planar surface, where the UV-cured pressure-sensitive adhesive layer includes a UV-cured acrylic resin, a release member removably secured to the pressure-sensitive adhesive layer opposite the planar body; and including a second pre-applied primer layer disposed along a lap area on the first planar surface;

(iv) adhesively securing the second membrane composite to the roof surface through the UV-cured pressure-sensitive adhesive layer, where the second membrane composite is positioned adjacent to and partially overlapping the lap area of the first membrane composite; and

(v) adhesively securing the second membrane composite to the first planar surface of the first membrane composite along the pre-applied primer layer through the UV-cured pressure-sensitive adhesive layer disposed on the second membrane composite.

2. The method of claim 1 , further comprising removing a release member that is removably secured to the pre-applied primer layer.

3. The method of claim 1 , wherein the lap area extends along a lateral edge of the polymeric planar body.

4. The method of claim 1 , wherein the pre-applied primer layer includes derives from a primer composition including polyvinylacrylates, polyvinylmethacrylates, polyisoprene, polyisobutylenes, polystyrene-methacrylate copolymer, polystyrene-acrylate copolymer, polyvinylchloride, polyvinylidenedichloride, polyvinylidenedichloride-ethylene copolymer, polyvinylchloride-ethylene copolymer, polyvinylacetate, polyvinylacetate-ethylene copolymer, polystyrene, polystyrene-ethylene copolymer, polystyrene-isoprene copolymer, polystyrene-butylene copolymer, or polystyrene-butadiene copolymer.

5. The method of claim 1 , wherein the pre-applied primer layer includes a copolymer of esters of methacrylic acid and acrylic acid or combinations thereof.

6. The method of claim 1 , wherein the pre-applied primer layer derives from a solvent-based primer composition, and wherein the solvent-based primer composition includes from 2 to 25 weight percent of a solvent selected from the group consisting of acetone, butyl acetate, and combinations thereof.

7. The method of claim 1 , where the UV-cured pressure-sensitive adhesive layer has a thickness of from about 102 to about 381 μm and a Tg of less than 0° C.

8. The method of claim 1 , where the UV-cured pressure-sensitive adhesive includes one or more units deriving from butyl acrylate or 2-ethylhexyl acrylate.

9. The method of claim 1 , where said step of providing the second membrane composite includes providing the second membrane composite in the form of a roll, and where the process further includes unrolling the second membrane composite.