JL Industries RHDG-4WT 36 × 36 Roof Hatch – Diamond Series, White Powder Coat

The JL Industries RHDG-4WT is a Diamond Series ladder-access roof hatch constructed from galvannealed steel, combining durability, functionality, and thermal efficiency. It includes R-6 polyisocyanurate insulation in both curb and cover, and features the Diamond Grip embossed counterflashing to secure the roof membrane without tools. The hatch’s design includes a 75° opening angle, 163 lb weight, and tested wind uplift of 50 psf.

Key Features

• Ladder access configuration, net size 36 × 36
• Galvannealed steel curb and cover with R-6 insulation
• Diamond Grip tool-free roof membrane securement
• Automatic locking hold-open arm and 75° opening angle
• Slam latch with padlock hasps tested to 50 psf wind uplift

Model: RHDG-4WT, size 36″ × 36″

Curb: 14 gauge galvannealed steel single wall curb and counterflashing with Diamond Grip

Cover: 14 gauge galvannealed steel with 22 gauge liner; formed and welded; live load rating 40 psf

Finish: White textured powder coat paint

Gasket: Continuous, weatherproof EPDM sponge rubber adhesive-backed seal

Insulation: 1″ polyisocyanurate in curb and cover; thermal resistance R-6

Hinge: Heavy duty clear zinc-plated steel pintle hinge

Hold-open arm: Clear zinc-plated automatic locking hold-open arm with red vinyl grip

Latch: Clear zinc-plated steel slam latch with inside/outside handles and padlock hasps; wind uplift tested to 50 psf

Springs: Counterbalanced compression springs in clear zinc-plated steel cylinders

Clear opening: 25″ × 30″

Door opening: 75°

Weight: 163 lb

Notes: For pitched roofs up to 7:12, mount hinge side parallel to slope

• Verify roof opening and framing match the 36″ × 36″ ladder access model.
• Position the curb, orienting the hinge side parallel to roof slope (if ≤ 7:12).
• Secure curb per project fastening plan, ensuring continuous gasket contact.
• Install the cover, confirm the hold-open arm locks and the door opens to 75°.
• Test the slam latch from inside and outside; install padlocks if needed.

Q: What is the insulation value of RHDG-4WT?
A: It uses 1″ polyisocyanurate insulation in the curb and cover, giving R-6 thermal resistance.

Q: What is the clear opening size?
A: The clear opening is 25″ × 30″.

Q: What wind uplift rating does the latch meet?
A: The slam latch is tested to 50 psf wind uplift.

Q: What is the weight of this hatch?
A: 163 lb.

Q: What live load is the cover rated for?
A: 40 psf live load.