# US 2025/0154768 A1 · Reusable insulated roof system and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0154768 A1 - Document ID: US20250154768A1 - Status: Published application - Kind: A1 - Application number: 18/873,941 - Filed: 2023-04-12 - Published: 2025-05-15 - Earliest claimed: 2022-05-03 - Assignees: Pittsburgh Corning Europe NV - Applicants: Pittsburgh Corning Europe NV - Inventors: Ellen Kuppens; Marc Clynhens; Frank Vanhove; Sylvain Terryn; Sven Van Caimere - Web page: https://patentgrep.com/patent/US20250154768A1 ## CPC - E04D 11/02: Build-up roofs, i.e. consisting of two or more layers bonded together in situ, at least one of the layers being of watertight composition (gravelling of flat roofs E04D7/00; venting or ventilation E04D13/17) - E04D 3/351: {at least one of the layers being composed of insulating material, e.g. fibre or foam material} - E04D: ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS (coverings of outer walls by plaster or other porous material E04F13/00) ## Abstract A roof system includes a waterproofing layer and a cellular glass insulation layer. A protective coating is applied to an uppermost surface (i.e., a surface furthest from the roofing deck) of the cellular glass insulation layer. The waterproofing layer is loosely laid on the uppermost surface of the cellular glass insulation layer, such that the protective coating is positioned between the cellular glass insulation layer and the waterproofing layer. This arrangement facilitates subsequent separation (e.g., manually) of the waterproofing layer from the cellular glass insulation layer. A roof assembly is also provided which comprises a roof system and a roof deck. Also provided is a method of installing and uninstalling a roof assembly. ## Claims ### Claim 1 A roof system for a roof assembly, the roof system comprising: a cellular glass insulation layer; and a waterproofing layer, wherein the waterproofing layer is loosely laid above the cellular glass insulation layer; wherein the cellular glass insulation layer comprises one or more layers of cellular glass insulation material; and wherein the uppermost layer of cellular glass insulation material has a protective coating on its uppermost surface, such that the protective coating forms an upper face of the cellular glass insulation layer and is positioned between the cellular glass insulation layer and the waterproofing layer. ### Claim 2 (depends on 1) The roof system of claim 1, wherein the waterproofing layer comprises at least two layers of waterproofing material, and wherein one of said layers is loosely laid above the cellular glass insulation layer. ### Claim 3 (depends on 1) The roof system of claim 1, wherein the protective coating is selected from mineral protective coatings, silica-based protective coatings, and alkali metal silicate-based protective coatings. ### Claim 4 (depends on 1) The roof system of claim 1, wherein the protective coating is selected from calcium hydroxide-based coatings, calcium sulphate-based coatings, modified silica-based coatings, lime-based coatings and renders, and alkali metal silicate-based coatings. ### Claim 5 (depends on 1) The roof system of claim 1, wherein the cellular glass insulation layer is formed of a plurality of cellular glass insulation slabs. ### Claim 6 (depends on 1) The roof system of claim 1, which further comprises roof ballast positioned directly or indirectly abutting the upper surface of the waterproofing layer. ### Claim 7 A roof assembly comprising a roof system and a roof deck, wherein the roof system is loosely laid on top of the roof deck, and wherein the roof system comprises: a cellular glass insulation layer; and a waterproofing layer, wherein the waterproofing layer is loosely laid above the cellular glass insulation layer; wherein the cellular glass insulation layer comprises one or more layers of cellular glass insulation material; and wherein the uppermost layer of cellular glass insulation material has a protective coating on its uppermost surface, such that the protective coating forms an upper face of the cellular glass insulation layer and is positioned between the cellular glass insulation layer and the waterproofing layer. ### Claim 8 A roof assembly comprising: a roof system comprising: a cellular glass insulation layer; and a waterproofing layer, wherein the waterproofing layer is loosely laid above the cellular glass insulation layer; wherein the cellular glass insulation layer comprises one or more layers of cellular glass insulation material; and wherein the uppermost layer of cellular glass insulation material has a protective coating on its uppermost surface, such that the protective coating forms an upper face of the cellular glass insulation layer and is positioned between the cellular glass insulation layer and the waterproofing layer; a roof deck; and a vapor barrier, wherein the vapor barrier is positioned between the lowermost layer of cellular glass insulation material and the roof deck, and wherein the cellular glass insulation layer is loosely laid onto the vapor barrier. ### Claim 9 (depends on 8) The roof assembly of claim 8, wherein the vapor barrier is loosely laid onto the roof deck. ### Claim 10 A method of installing a roof assembly, the method comprising: (i) installing a cellular glass insulation layer to a roof deck, wherein the cellular glass insulation layer comprises one or more layers of cellular glass insulation material; (ii) coating the uppermost surface of the uppermost layer of cellular glass insulation material with a protective coating; (iii) loosely laying a waterproofing layer onto the protective coating, wherein the waterproofing layer comprises one or more layers of waterproofing material; and (iv) positioning roof ballast directly or indirectly abutting the upper surface of the waterproofing layer. ### Claim 11 (depends on 10) The method of claim 10, wherein the cellular glass insulation layer is formed of cellular glass insulation slabs. ### Claim 12 (depends on 10) The method of claim 10, which further comprises positioning a vapor barrier between the roof deck and the cellular glass insulation layer such that the vapor barrier is loosely laid onto or adheres to the roof deck and the cellular glass insulation layer is loosely laid on the vapor barrier. ### Claim 13 (depends on 10) The method of any of claim 10, wherein the protective coating is selected from mineral protective coatings, silica-based protective coatings, and alkali metal silicate-based protective coatings. ### Claim 14 (depends on 10) The method of any of claim 10, wherein the protective coating is selected from calcium hydroxide-based coatings, calcium sulphate-based coatings, modified silica-based coatings, lime-based coatings and renders, and alkali metal silicate-based coatings. ### Claim 15 A method of uninstalling a roof assembly comprising a roof system and a roof deck, wherein the roof system is loosely laid on top of the roof deck, and wherein the roof system comprises: a cellular glass insulation layer; and a waterproofing layer, wherein the waterproofing layer is loosely laid above the cellular glass insulation layer; wherein the cellular glass insulation layer comprises one or more layers of cellular glass insulation material; and wherein the uppermost layer of cellular glass insulation material has a protective coating on its uppermost surface, such that the protective coating forms an upper face of the cellular glass insulation layer and is positioned between the cellular glass insulation layer and the waterproofing layer, the method comprising: (i) if present, removing a roof ballast; (ii) removing the waterproofing layer; (iii) removing the cellular glass insulation material coated with the protective coating; and (iv) if present, recovering the cellular glass insulation material not coated with the protective coating. ### Claim 16 (depends on 15) The method of claim 15, which further comprises removing the vapor barrier if present and if loosely laid onto the roof deck. ### Claim 17 (canceled)