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Wellhöfer Passive House Liliput Attic Hatch
Product Overview
Main purpose
Ultra low U-value (0.48W/m²K) attic hatch with space-saving concertina ladder. Allows access to the attic space without compromising the airtightness or insulation of a building.
Use it on
Ceilings up to 4.10m high in airtight buildings and Passive Houses, especially where there is not enough space for a three-section folding ladder.
Overview
The Wellhöfer Certified Passive House Liliput Attic Hatch provides loft access without compromising the airtightness and insulation of an airtight building. The hatch is fully airtight, with 96mm of high-performance insulation in the door and an insulated frame to help buildings achieve the Passive House standard.
It is easy to install, with tests proving airtightness 5 times better than Europe’s most stringent air leakage standard (DIN 4108-2).
The compact light-weight aluminium concertina ladder is easy to extend and requires minimal floorspace below. It is tested for loads up to 150kg.
Where to use it
This Wellhöfer Passive House Liliput attic hatch is for use in rooms with a ceiling height up to 3.15m in airtight and Passive Houses. It has been designed specifically for use in Passive Houses where there may not be enough space for a three-section folding ladder.
The hatch is compatible with all types of ceiling: timber joists & beams, suspended ceilings and concrete ceilings.
What it does
The Wellhöfer Liliput Passive House attic hatch provides access to the roof/loft space without compromising airtightness or the effectiveness of the building’s insulation. It has 96mm of high-performance insulation on the door, insulation around the frame, and an innovative sealing system to prevent air leaks around both the door and the frame.
The aluminium concertina ladder can be extended more easily and requires less floorspace underneath the hatch. In contrast, ladders that fold into three sections typically need more clearance space to enable them to unfold without hitting an adjacent wall.
Air leaks around attic hatches drastically reduce the effectiveness of the building’s insulation layer, cause cold-spots and lead to condensation when warm humid air from below meets the cold air in the loft/roof space above. The Hoka airtight sealing system, together with high-performance insulation, helps reduce the overall heating costs of the building.
How it works
The attic hatch door is made from white 16mm melamine resin-coated chipboard and includes a locking mechanism so it cannot be opened from above.
The weight of the ladder is counter-balanced with a lever and spring system to evenly spread the load and provide a safe low-effort operation. This spring also provides even contact pressure for a proper airtight seal.
Why we love it
Wellhöfer's Certified Passive House Attic Hatches were the first ever to receive passive house certification from the Passive House Institute in Germany.
The airtightness of the hatch remains constant during a blower door test; easily coping with the additional air pressure thanks to its innovative airtight sealing system.
In addition to Passive House certification testing, the hatch has been thoroughly tested for thermal performance, airtightness and the emission of harmful chemicals, VOCs and off-gassing. The test results show the hatch and stairs have 9 times less VOCs and 16 times less formaldehyde than what is considered harmless by the Sentinel Haus Institut. For airtightness, the tests prove it is 5 times better than Europe’s most stringent air leakage standard (DIN 4108-2)
The Wellhöfer Liliput aluminium concertina ladders have 11cm deep steps and are overload-tested up to 150kg.
Additional Options
Versions of this attic hatch with an enhanced Fire Rating are also available as special order. Please contact us for price and availability.
The three options are:
- FS30
Fire resistance of 30 minutes from below the hatch - FS30 2S
Fire resistance of 30 minutes from below and above the hatch - FS90 2S
Fire resistance of 90 minutes from below and above the hatch
Features
- Space-saving aluminium concertina ladder
- Stringently tested and Passive House certified
- Fully insulated attic hatch door and frame
- Surpassed VOC and emission testing by renowned Sentinel Haus Institute
- Ladder tested for 150kg loading
Benefits
- Surpassed other standard attic hatches by offering a superior U-value of 0.48 W/m²K
- Concertina ladder requires no additional space to un-fold so can be installed closer to walls or where floor-space is more limited
- Fully airtight, offering a robust solution to achieving airtightness when attic access is required.
- Ideal for projects that want to meet tough building performance requirements or standards.
- Provides permanently high levels of airtightness and insulation performance all year round.
- Remains airtight during the harshest winds outside and during blower door test conditions.
- No harmful chemicals or off-gassing that pollute your home. It has 16 times less formaldehyde and 9 times less VOCs than what is considered harmless.
Questions
There are currently no questions and answers published for this product
Technical Details
Key Technical Data
Installation Guide
How to Install
Please ensure you have measured the ceiling height correctly and purchased the correct attic hatch for that ceiling height.
The size of attic hatch you purchase indicates the size of hole you need in your ceiling. The actual size of the hatch is 40mm smaller than the required hole to allow 20mm of space all around for insulating the sealing system.
Choose a position between the ceiling joists and structural timbers which is suitable to accommodate the hatch. The system is supplied with a double-sided airtight tape which has a thick strip of grey coloured adhesive on one side. This side of the tape should be stuck to the ceiling opening first.
Lower the hatch into place until level and plumb with the ceiling below, and secure it with screws. Insert the tubular insulation and pour in the insulated beads.
To complete the airtight seal, the second side of the airtight tape should be stuck to the hatch frame (at the bottom) and pressed down firmly. PVC architrave is added next, to hide the tape and provide a slick and clean finish.
Once the Wellhöfer attic hatch is securely installed, the Liliput ladder can be mounted. Begin by removing the two upper nuts from the ladder assembly. Using the supplied fixings, attach the ladder to the predrilled holes on the hatch door. After securing the ladder, ensure all fixings are fully tightened. Then loosed the upper nuts by half a turn to prevent overtightening which could lead to increased wear during operation. Fully open the hatch door and extend the ladder completely to identify the points where it meets the floor. Apply the floor protection covers at these locations to prevent pressure marks or damage to the final floor surface.
If the height of the ceiling is up to 50mm higher or 50mm lower than you expected, the ladder can be adjusted to change the angle of the ladder and safely deal with the error. European loft-ladder regulations EN 14975 state the angle of the ladder must be no steeper than 61°.
Hints & Tips
If cladding or panelling is added to the hatch door, the additional weight may require the spring tension to be adjusted.
We recommend lubricating the moving parts with a drop of suitable lubricant every 12 months and checking the tightness of all non-rotating/moving connecting bolts regularly.
If your ceiling opening is more than 20mm different to one of the standard sizes, a custom size can be manufactured as a special order. Custom sizes incur additional cost to manufacture and for delivery (from Germany). Custom length: 1000mm - 1600mm, custom width: 600mm - 1000mm.