| | The Grid panel roof sheathing (Martco) on Teaching Center |
| | 40/20 APA rated, borate treated plywood panels, 19/32 in. thick for wind resistance, attached with 8d ring shank nails 6” o.c. and 4” o.c. at gable ends |
| | | Grid markings make installation faster |
| | Roof panel joints are covered with adhesive polymer modified bitumen tape to provide secondary water resistance |
| | Light weight synthetic roofing felt that is highly tear resistant (Tri-Flex 30 by Grace) |
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