Wellhöfer Attic hatch and Sealing System.
- The attic hatch is generally the single largest penetration in a ceiling of a building.
- The airtightness and thermal resistance of an attic hatch has a direct & significant
- effect on the overall thermal performance of a ceiling.
- The quality of the airtightness of not only the hatch door, but also the integrity and means by which the hatch frame is sealed to structural joists or noggins also has a significant impact on the airtightness of the ceiling.
- It is essential not only to apply a hatch door which is certified airtight and adequately insulated, but the installation of the complete unit must be fully airtight to realise optimum performance.
The Advantages of a Wellhofer Attic Hatch & Sealing System
Ecological Building Systems supply such an attic hatch is the Wellhöfer 4D hatch and sealing system. The Wellhöfer 4D attic hatch not only features a certified airtight and pre insulated attic door, but also features an independent airtightness sealing system which seals the hatch frame to the surrounding timber joists, noggins or the adjacent airtightness and vapour control layer. The hatch door is not only 3rd party certified airtight door, but the additional hatch frame sealing system has also received 3rd party airtightness certification.
The airtight seal of the hatch door is maintained by means of a pre-stressed spring which ensures the door remains airtight, even when a blower door test is carried out. This spring is fully adjustable to the homeowner’s requirements. The airtightness of Wellhöfer 4D is 5 times better than that required by DIN 4108-2 and is certified to EN 1026:200-09.
The complete hatch also features a low U value of 0.78W/m2k certified to EN ISO 12567 – 1: 2001/02. It should be noted that this U value is for the complete system rather than a single optimum position in the centre of the door.
When specifying a truly airtight attic hatch one should ensure not only that the door is airtight, but also, the means by which the attic hatch’s frame is sealed to the adjoining vapour control layer or timber noggin. One may install an attic hatch which has an airtight door, yet, the leakage area between the frame and the surrounding noggin can lead to a hole the size of an A4 page in the ceiling and an additional 70-100 litres of heating oil required per year! Therefore one cannot underestimate the importance of not only installing an airtight and adequately insulated attic hatch, but also to ensure the frame is also installed airtightly.
A poor installation of an airtight attic hatch means that while the door is airtight, the gap between the frame and the surrounding joists may lead to high levels of heat loss, air leakage and significantly increased risk of condensation and mould growth within the attic space.
Further product information and technical details regarding certified airtight pre-insulated Wellhöfer 4D attic hatch can be found on the Ecological Building Systems website http://bit.ly/1TVrnZ9
Ecological Building Systems currently have a Webshop Promotion on Wellhoffer Attic Hatchs http://bit.ly/29xuqIO
Niall Crosson, Senior Engineer, B.TECH. MENG.SC CEPHC MIEI
Wellhöfer 4D hatch, sealing system, airtight attic hatch, airtightness certification, thermal performance, pre insulated attic door,
No comments:
Post a Comment