High-strength built-up roofing using improved ply sheets
US4567079A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1984 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Oct 1, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31815
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Lighter weight, high strength, built-up roofing (BUR) membranes, systems and process for obtaining same are provided herein. These BUR membranes are made by using an improved ply sheet having uniform ventability and attachment in the overall assembly and superior resistance to wind uplift. The improved structure involves a ply sheet carrying 1/8 inch diameter or larger perforations along its longitudinal border in an area comprising between 1/5 and about 1/2 the width of the ply sheet. The ply sheets here employed for the BUR assembly or membrane have a thickness essentially not in excess of the layer of bonding agent applied over each ply in the assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.