Building sheet
US3990206A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1975 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Jun 16, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04D3/30
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A building sheet suitable for roofing and siding use that accommodates fastening along ribs or valleys of a side lapped juncture between two sheets. Strengthening ribs formed from bends in the sheet are shaped to promote stacking, to consume little of the sheet width, and to avoid sharp bends that crack protective coatings. An anti-siphon gap is provided between each lapped and lapping rib, extending the full height of the lapped rib adjacent the lapping edge. A drain trough formed at the base of the gap carries away any water that leaks beneath the overlapping sheet. Low ribs delineate channels in which fasteners can be driven to engage an underlapped edge at a side lap juncture between sheets. A top flat surface of high ribs is narrow enough for stiffness to inhibit deformation by fasteners and restricts the fasteners to locations that avoid drain penetration at side laps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.