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Wellhöfer Liliput Attic Hatch
Product Overview
Main Purpose
To provide access to the attic or roof space without compromising the airtightness or thermal performance of a building. The aluminium concertina ladder provides convenient and space-saving access to lofts or attics.
Can be used on
All ceiling types in domestic and commercial buildings. Ceilings up to 4.1m high in airtight buildings and Passive Houses, especially where there is not enough space for a three-section folding ladder.
Overview
The Wellhöfer Liliput attic hatch provides loft access without compromising the airtightness and insulation of an airtight building. The hatch is fully airtight tested in accordance with EN 1026:200-09, and easy to install.
The concertina aluminium ladder is suitable for loads up to 150kg and provides convenient and space-saving access to lofts or attics.
Where to use it
The Wellhöfer Liliput Airtight Insulated Attic Hatch can be fitted in ceilings, up to 4.1m high, in airtight newbuild or refurbishment (retrofit) projects. The hatch is compatible with all types of ceiling including those with timber joists/beams, suspended ceilings and concrete ceilings.
What it does
A Wellhöfer Liliput attic hatch provides access to the roof space or loft without compromising airtightness or the effectiveness of the building’s insulation.
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 the building meets cold air in the loft/roof space. Poorly performing insulation will also increase the overall heating costs of the building.
This hatch has 96mm of high-performance insulation built-in and an innovative sealing system to ensure no air can leak via the door or from around the edges of the frame.
The aluminium concertina ladders are suitable for loads up to 150kg and provides convenient and space-saving access to lofts or attics.
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 also provides even contact pressure for a proper airtight seal.
The airtightness level achieved with Wellhöfer attic hatches remains the same during airtightness tests (blower door test).
The concertina aluminium ladders have 11cm deep steps and are load tested up to 150kg.
Why we love it
Wellhöfer are the only attic hatches in the world where both the hatch door and frame are certified in accordance with EN 1026:200-09. The perimeter casing uses Wellhöfer’s HOKA twin wall sealing system to provide an exceptional level of airtight detailing. This is one of Wellhöfer’s leading features which contributes to the success of the hatches over the past 60 years. It is simple to install and ensures there is no air leakage or resulting heat loss between the perimeter of the attic hatch and surrounding timber framework (or concrete).
Wellhöfer attic hatches have also completed thorough testing for the emission of harmful chemicals, VOCs and off gassing. The test results showed that the attic hatch has a rating 9 times lower than the “harmless” level required by the Sentinel Haus Institut, while the formaldehyde emission value is recorded at being 16 times lower.
Additional Options
This attic hatch is also available in a Fire Rated version for an additional cost. The three options are:
- FS30
provides fire resistance of 30 minutes from below the hatch into the attic - FS30 2S
provides fire resistance of 30 minutes from both below and above the hatch - FS90 2S
provides fire resistance of 90 minutes from both below and above the hatch
Please contact us for further information on these fire rated options.
Features
- Space-saving aluminium concertina ladder
- Unique airtight sealing system of door and frame
- Door and perimeter casing tested in accordance with DIN EN 1026:2016-09 air permeability: Class 4
- Fully insulated door and perimeter seal
- Stringently tested for airtightness & thermal performance
- Surpassed VOC and emission testing by renowned Sentinel Haus Institut
- Manufactured by world leader in high performance attic hatches
Benefits
- The high-quality aluminium concertina ladder provides convenient and space-saving access to lofts or attics.
- Tested for 150kg loading the Liliput ladder offers safe and steady access for all users
- Proper sealing of the hatch frame prevents the air leakage equivalent of an A5 size hole in your ceiling.
- Preventing heat loss through the attic improves energy efficiency and reduces heating bills.
- Each hatch is built with experience gained over 60 years.
- 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.
- The frame and door have 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
Please ensure you have measured the ceiling height correctly and purchased the correct attic hatch for that ceiling height.
The dimensions of the attic hatch refer to the size of the hole in the ceiling; the hatch will be supplied 15mm smaller to fit perfectly into that size hole.
Choose a position between the ceiling joists and structural timbers which is suitable to accommodate the hatch. Additional timber may need to be added at right angles to the joists to form noggins that frame the opening and provide structural support for the hatch when installed. The long side of the hatch should align with the joists and the short side with the noggins. Before installation begins, the perimeter of the ceiling opening must be sealed airtight to the surrounding airtightness layer. The area around the ceiling opening should be free of any obstructions like wiring or pipes, etc.
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 to the ceiling opening with screws. The strips of tubular/cylindrical insulation are then squeezed into the gap between the ceiling opening wall, and the hatch.
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.
If the installation is part of a refurbishment (retrofit), the distance between joists may not be suitable. In this situation, additional timbers may need to be fitted around the ceiling opening to upgrade the structural integrity of the ceiling and provide a solid material for the fixing screws.
If you are installing the hatch into a concrete ceiling, please use 8mm concrete fixings; the supplied screws are only suitable for use with timber.
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 loosen 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 that 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 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.