The Bilco S-20 is a 36 in x 30 in galvanized Type S roof hatch for roof access from a fixed interior ladder. It is the right style when a commercial roof needs a preassembled, weather-gasketed hatch with one-hand, counterbalanced operation.

Key Specs

• Model / MPN: S-20
• Brand: Bilco
• Type: Type S roof hatch for fixed interior ladder access
• Opening size: 36 in x 30 in curb-to-curb
• Material: Galvanized steel
• Operation: Counterbalanced cover with automatic hold-open arm
• Weathering: Fully gasketed and insulated cover/curb
• Live load: 40 psf per Type S guide specification
• Sell unit: Each

Compatibility / Fitment

Designed for ladder-access roof openings matching the 36 in x 30 in Type S curb size. Do NOT use it as a ship stair, service stair, equipment hatch, smoke vent, or custom-size curb replacement without verifying the opening and submittal drawings.

FAQs

What opening size does the S-20 fit?

The Type S-20 hatch is specified for a 36 in x 30 in curb-to-curb opening. Confirm both the rough opening and the hinge-side orientation against the project drawings before ordering.

Is it easy to open from a ladder?

Yes. Bilco Type S hatches use a counterbalanced cover and automatic hold-open arm so the user can open or close the cover while keeping one hand on the ladder.

Is the hatch insulated and gasketed?

Yes. The Type S guide specification describes an insulated cover and curb with gasketed, overlapping cover construction for weather resistance.

Can it be used in high-wind coastal work?

Bilco literature and distributor technical pages reference Miami-Dade and Florida approvals for the S-20 family. Verify the exact approval document and project wind requirements before submittal.

What roofing detail matters most?

The curb/flashing interface matters. Coordinate the Bil-Clip or project flashing detail with the roofing membrane so water is directed away from the curb and the hatch warranty is not compromised.

Roof hatches are fall-exposure access points. Coordinate guardrails, ladders, lockout/security, and local code requirements with the project safety plan.

Product Expert Notes

A good pro-grade hatch listing because buyers need exact opening, access style, curb/flashing details, and approval confidence more than lifestyle copy. The S-20 should be sold against drawings, not guessed from a photo.