Multilayer Flashing Tape
The present disclosure relates generally to a flashing tape used in construction applications to seal out moisture, and methods of using the same. The tape constructions disclosed include a viscoelastic core layer and at least one elastomeric skin layer, and may further contain a layer of pressure sensitive adhesive to attach the flashing tape to a substrate.
1 . A method of sealing a surface, the method comprising the steps of:
(i) providing the multilayer film comprising a viscoelastic core layer having a first major surface opposite a second major surface, and a core layer thickness; and a first elastomeric skin having a first skin thickness bonded to the first major surface of the core layer; and
(ii) adhering the multilayer film to the surface.
2 . The method of claim 1 , wherein the surface is a fenestration surface.
3 . The method of claim 2 , wherein the surface comprises the intersection between buildings surfaces, optionally wherein the building surfaces are selected from the group consisting of a roof-wall joint, a roof valley, a wall-to-wall joint, ledger-board wall joints, the joint between the underside of a roof and the adjacent wall, and a roof peak.
4 . The method of claim 1 wherein the multilayer film further comprises a second elastomeric skin having a second skin thickness bonded to the second major surface of the core layer.
5 . The method of claim 4 , wherein a first ratio of the core layer thickness to the first skin thickness and a second ratio of the core layer thickness to the second skin layer thickness of no greater than 5.
6 . The method of claim 5 , wherein both the first ratio and the second ratio are at least 0.2.
7 . The method of claim 1 , wherein the viscoelastic core layer has a storage modulus of from 30,000 Pa to 500,000 Pa.
8 . The method of claim 7 , wherein the viscoelastic core layer has a storage modulus of no greater than 100,000 Pa.
9 . The method of claim 7 , wherein the viscoelastic core layer has a storage modulus of at least 200,000 Pa.
10 . The method of claim 1 , wherein the core layer thickness is no greater than 127 microns.
11 . The method of claim 4 , wherein the first skin thickness and the second skin thickness are each no greater than 127 microns.
12 . The method of claim 1 , wherein the first elastomeric skin has a tensile modulus of no greater than 8 MPa.
13 . The method of claim 1 , wherein the first elastomeric skin has a tensile modulus of between 10 and 20 MPa.
14 . The method of claim 1 , wherein the first elastomeric skin has a tensile modulus of at least 30 MPa.
15 . The method of claim 1 , wherein the core layer has a storage modulus at least 200,000 Pa, and the first elastomeric skin has a tensile modulus of no greater than 8 MPa.
16 . The method of claim 1 , wherein the core layer has a storage modulus no greater than 100,000 Pa, and the first elastomeric skin has a tensile modulus of at least 30 MPa.
17 . The method of claim 1 , wherein the first elastomeric skin has an elastic recovery of greater than 90%.
18 . The method of claim 1 , wherein viscoelastic core and the first elastomeric skin comprise a thermoplastic material.
19 . The method of claim 1 , further comprising an adhesive layer on at least a portion of one or more of the first elastomeric skin, and the core layer.
20 . The method of claim 1 , wherein the film is self-sealing as indicated by an 80% nail pass rate based on the Modified ASTM E331 Spray Booth Test.