The JL Industries Diamond Series is an insulated galvanneal roof hatch for permanent roof access, made in the USA. The curb and cover both carry 1 in polyisocyanurate insulation at R-6, the welded cover is tested to a 40 psf live load, and the slam latch is tested to 50 psf wind uplift, so the hatch holds its seal and stays shut in weather. Counterbalanced compression springs and an automatic locking hold-open arm let one person open it and hold it with one hand. Pick the size that matches your roof opening above.
Specifications
| Series | Diamond Series, galvanneal steel (RHDG) |
| Curb | 14 ga galvannealed steel single wall curb and counterflashing with Diamond Grip |
| Cover | 14 ga galvannealed steel formed, welded cover with 22 ga liner, tested to support a 40 psf live load |
| Insulation | 1 in polyisocyanurate in curb and cover, thermal resistance R-6 |
| Gasket | Continuous weatherproof EPDM sponge rubber, adhesive-backed |
| Springs | Counterbalanced compression springs in clear zinc-plated steel cylinders |
| Latch | Clear zinc-plated steel slam latch, inside and outside handles, padlock hasps, tested to 50 psf wind uplift |
| Hold-open arm | Clear zinc-plated automatic locking arm with red vinyl grip, one-handed operation |
| Hinge | Heavy duty clear zinc-plated steel pintle hinge |
| Door swing | Opens 75 degrees |
| Finish | White textured powder coat |
| Country of Origin | USA |
Sizes
| Curb size | Model | Access | Weight |
| 36 x 30 in | RHDG-1WT | Ladder | 138 lb |
| 36 x 36 in | RHDG-4WT | Ladder | 163 lb |
| 30 x 54 in | RHDG-2WT | Stair | 188 lb |
| 48 x 48 in | RHDG-5WT | Ladder | 233 lb |
Ladder-access sizes serve a fixed ladder; the 30 x 54 in stair size is proportioned for a stairwell. Clear opening is smaller than the curb size, so check the submittal for the model you are specifying. Aluminum, thermally-broken and other sizes are factory orders; ask us for a quote.
Guarding the opening
Under 29 CFR 1910.28(b)(3)(iv), an employee has to be protected from falling into a ladderway hole by a guardrail system with toeboards on the exposed sides, and the entrance to the hole needs a self-closing gate or an offset. The guardrail criteria are in 1910.29. That is the general-industry rule covering operations and maintenance; construction, alteration and repair work is covered instead by 1926 Subpart M, including when it happens inside an existing building. Confirm the final gate or offset configuration with your AHJ before ordering.
Installation note
On pitched roofs up to 7:12, mount the hinge side parallel to the slope. The manufacturer's installation and maintenance guide is linked below.
Documents and downloads
For specification and installation: the manufacturer's RHDG-1WT submittal (PDF), Diamond series installation and maintenance guide (PDF). Need a project-specific submittal filled out? Send us the project details with a quote request.