# US 4,396,686 A · Roofing element for roofs of buildings

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- Number: US 4,396,686 A
- Document ID: US4396686A
- Status: Granted
- Kind: A
- Application number: 06/433,379
- Filed: 1982-10-08
- Granted: 1983-08-02
- Earliest claimed: 1981-10-06
- Inventors: Guido Fiorio
- Web page: https://patentgrep.com/patent/US4396686A

## CPC

- E04D 3/351: {at least one of the layers being composed of insulating material, e.g. fibre or foam material}
- E04D 3/358: {with at least one of the layers being offset with respect to another layer}
- Y10T 428/12549: Adjacent to each other
- Y10T 428/12569: Synthetic resin
- Y10T 428/2443: Sand, clay, or crushed rock or slate
- Y10T 428/24512: Polyurethane
- Y10T 428/249987: With nonvoid component of specified composition
- Y10T 428/24999: Inorganic
- Y10T 428/31717: Next to bituminous or tarry residue
- E04D: ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS (coverings of outer walls by plaster or other porous material E04F13/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A roofing element for roofs of civil and industrial buildings comprising a layer of expanded polyurethane having high thermal insulation capacity, a support made of zinc-plated sheet steel overlying said layer of expanded polyurethane and adhering thereto at all points, a thin layer of a bituminous compound and a continuous layer of stone material in fine scales caused to adhere to said thin layer of bituminous compound.

## Claims

### Claim 1

A roofing element for roofs of civil and industrial buildings, characterized in that it comprises, in combination:
(a) a layer of expanded polyurethane having high thermal insulation capacity;
(b) a support made of zinc-plated sheet steel overlying said layer (a) of expanded polyurethane and adhering thereto at all points;
(c) a thin layer of a bituminous compound, and
(d) a continuous layer of stone material in fine scales caused to adhere to said thin layer of bituminous compound as defined at (a).