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Service Stair Roof Hatch Type L-50TB Product Image
Service Stair Access Roof Hatch
L-50TB 760x2440mm

The L-50TB is an ideal Roof Access Hatch for installations where frequent access to the roof area is expected from full sized stairs with standard headroom.

At 760x2440mm, the L-50TB enables easier movement of maintenance personnel, tools and equipment to and from the roof area (Patent pending).

Illustration showing a man on a ladder below a hatch

L-50TB

Features / Benefits

Thermally broken cover and frame design provide superior thermal performance.

Engineered with compression spring operators to provide smooth, easy, one-hand operation, regardless of size. All BILCO hatches meet the requirements of Manual Handling Regulations.

Automatic hold-open arm locks the cover in the open position to ensure safe egress. Grip handle allows for easy, one-hand release and closing.

Overlapping cover design, fully welded corners on cover and curb, closed-cell EPDM rubber gasket, and fully insulated cover and curb ensure weather tightness and energy efficiency.

Constructed with corrosion-resistant materials to provide many years of trouble-free, dependable service.

Heavy gauge construction and positive latching mechanism maintain building security. Curb features the Bil-Clip® Flashing System, an innovative method to quickly and easily secure single-ply roofing material to BILCO roof products.

Performance Standards L-50TB

U-VALUE 0.278 W/m²K (homogeneous)
1.39 W/m²K (Developed Area)
BS EN 12207:2000 Air Permeability 4.83 m³/hour/m² at 600Pa
BS EN 12208:2000 Water Tightness Class 9A
BS EN 12210:2000 Wind Resistance Class E2400
BS EN 1991-1 Snow Load 1200Pa for 1 hour
BS 8200 Impact Resistance Pass
BS EN ISO 140 Acoustic 25dB
BS EN 1627-1630 Security Pass
Wind Speed With Open Cover 30 m/s
Service stairs roof access hatch from Bilco UK

Downloads L-50TB

BIM Model (.zip)

External Resources / Links

Guide Specification L-50TB

MATERIALCover and frame are 2.3mm Aluminium
COVERBrake-formed, hollow-metal design with 75mm concealed polyisocyanurate insulation, 127mm beaded overlapping flange, fully welded at corners, and internally reinforced for 195 kg/m² live load.
CURB305mm in height with integral capflashing, 75mm polyisocyanurate insulation, fully welded at corners, and 140mm mounting flange with 11mm holes provided for securing frame to the roof deck.
GASKETExtruded EPDM rubber gasket permanently adhered to cover. Air leakage performance 4.83m³/hr/m² @ 600Pa Tested to BS EN 12207: 2000
HINGESHeavy-duty pintle hinges with 9.5mm Stainless Steel Type 316 hinge pins.
LATCHSlam latch with interior and exterior turn handles and padlock hasps.
LIFT ASSISTANCECompression spring operators enclosed in telescopic tubes. Automatic hold-open arm with grip handle release.
FINISHMill finish Aluminium
HARDWAREEngineered composite compression spring tubes with steel compression springs packed in grease. Stainless Steel Type 316 hinges. All other hardware is zinc plated/chromate sealed.
NOTESNational Physical Laboratory U-Value test report available upon request. Patent pending.

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Projects

S-50TB / ESW-50REM

Addenbrookes Hospital, Cambridge

View project