Insulated 562 x 726mm Loft Hatch – Part L Compliant
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- Description
- Additional information
- Environmental & Air Leakage Assessment
- Product Drawings
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Manthorpe Part L Compliant, Insulated Loft Hatch
Product Reference: GL250-035
Features:
- Door and frame are fully draught sealed.
- Seals supported by 12 perimeter catches.
- Sliding door catch operated from a single point.
- All hinge, catch and fixing geometry is located outside of the seal, providing no air leakage paths.
- Hinge detail hidden when door is locked.
- Hinge pivot is positioned to maximise opening.
- Innovative design of the hinge makes the door fully removable in seconds.
- Screws fix up into timbers, for fast and simple installation and optimum pressure on frame seal.
- Fully insulated door panel.
- Hinge blockers prevent unwanted door removal
- Suitable for use with loft ladders.
Loft Hatch Specification
| Insulated Loft Hatch Specification | |
|---|---|
| Colour: | White |
| Packing details: | Individually packed in a polythene bag and boxed |
| Box weight: | 5.40kg |
| Material: | High impact polystyrene |
| Manufacturing process: | Injection moulded |
| Draught seals: | Expanded polyurethane |
| U-Value: | 0.35 W/m2K |
The GL250-035-EPS drop down loft door is an innovative solution to the need for energy efficient loft space access, offering a cost effective alternative to traditional roof space access. The unobtrusive design coupled with sleek, contemporary styling makes the door an ideal match for modern decors.
The revolutionary design of the multi-point catch mechanism means that the GL250-035-EPS door can maintain a more effective draught seal around the entire accessible opening, helping to meet the air leakage requirements of Part L of the Building Regulations and preventing the problem of moist warm air entering the roof space causing condensation and heat loss issues.
Insulated Loft Hatch Benefits
Many drop down hatches suffer from ‘sagging’ over time, a problem that can cause the middle of the door to bow away from the draught seal, creating an air leakage path. To prevent this issue, the GL250-035-EPS door has 12 independent catch points located around the perimeter of the frame, operated from a single position with a unique sliding mechanism.
With the sliding cover replacing a conventional twist action locking mechanisms on the door, all of the hinge, catch and fixing geometry has been carefully located outside of the draught seal, meaning that there are no holes through the door that could pose an air leakage risk. When the cover is located in the fully closed position it also completely conceals the hinge detail.
The positioning of the doors pivot point is intended to maximise the accessible area available to the user when the door is open and the pioneering hinge design allows for it to be fully removed from the frame quickly and easily for simpler installation and better access with larger insulation options. The fixings for the frame also screw directly up into the ceiling for easier installation, also providing pressure in the optimum direction for the frame to ceiling seal.
The back of the door has been optimised to increase the amount of space available for insulation, allowing the 110mm of expanded polystyrene to cover a greater area within the structural opening to create a better thermal barrier, offering a U-Value of 0.35W/m²k.
The catch mechanism should be operated by hand to maintain maximum control over the door as it is opened. The door can also be used in conjunction with the GLL256 and GLL257 loft ladders.
| Fitting Size | 562mm x 726mm |
|---|---|
| Insulation Type | 60mm Polyurethane (0.35W/m²k), 110mm Expanded Polystyrene (0.35W/m²k) |
Environmental & Air Leakage Assessment
The expanded polystyrene insulation used on the back of the GL250-035-EPS door has a Global Warming Potential (GWP) of less than 5. The insulation is also CFC/HCFC-free with an Ozone Depletion Potential (ODP) of zero.
The effectiveness of the draught seals on the GL250 have been independently tested by the BRE in accordance with BS EN 13141-1:2004 (test report no. 283-506). The door exceeds the requirements for a “Well Sealed Ceiling” as detailed in BS 5250 with an air leakage rate below 1m³/h at a pressure differential of 2 Pa. This door also meets the Building Regulations Part L ‘reasonable limit’ for the design air permeability of buildings with a rate of less than 10m³/h.m² at 50Pa.
Product Drawings
