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Built to exceed the stringent air permeability testing for new homes. By combining the best draught proofing and insulation, no other loft hatch offers as much potential to reduce heat loss and save on heating as this range does. This slender, hinged loft hatch has very clean lines and is offered with a choice of 3 levels of insulation. It's easy to fit, easy to use and looks incredibly neat.
Model Specifications
Model
Insulation / depth
U-Value
Clear opening
Nominal Size
Overall Size
Weight
Supplied with
AT35
XPS / 60mm
0.35 W/m²K
520 x 560mm
560 x 640mm
(allow approx. + 5mm over this size when creating your structural opening)
605 x 685mm
4.5kg
Opening key, fixing screws / plastic o-rings to seal between screw head and fixing hole
AT25
XPS / 100mm
0.25 W/m²K
520 x 538mm
4.8kg
AT15
PIR / 100mm
0.15 W/m²K
520 x 538mm
5.4kg
Insulation values explained Expressed as U-Values which measures the amount of heat loss through a given material. To comply with Part L of the Building Regulations a loft hatch needs to achieve a U-Value of 0.35 W/m²K. Note because this is a measure of heat loss, the lower the U-Value, the better the performance.
Construction / Finish
Frame, Lid, Lock and cam: Steel Finish: Powder-coated white (RAL9016) - Maintenance free, easy to clean, ready painted.
Lock options:
Standard: Twist lock with a tri-drive lock body (Comes with opening key - Pole also available as separate item) Optional: Key lock available (Key supplied) Please note pole not suitable for use with this option Unlocking: Press upwards, against the lock and twist to open
Fitting
Easy to fit Fitting is a doddle, just screw fix through the pre-drilled holes in the frame into the surrounding joists. The spring loaded twist catch lock ensures a high compression seal between the door and the frame. The outer frame is also fitted with a seal to ensure air cannot easily escape from around the outer edge of the hatch. No additional sealant is required. Comes with fixing screws and plastic o-ring seals which maintain the air seal between the hatch and the fixings.
Air Permeability Testing
Independent testing carried out in accordance with BS EN 1026:2000 and BS EN 12207:2000 for ceiling use only. This requires testing to be carried out at a pressure of 50 Pascals (Pa). We opted for testing at higher pressures to demonstrate the quality of the product.
Pressure Differential Pa
Air Permeability Rate Infiltration & Exfiltration Tests(m³/hr/m²)
Test No.1
Test No.2
Average
50
0.46
0.23
0.34
100
0.46
0.96
0.57
150
0.92
0.92
0.92
200
1.61
1.84
1.72
250
1.61
1.61
1.61
300
1.15
1.84
1.49
450
2.76
1.84
2.30
600
13.32
1.38
7.35
Loft ladder compatibility
The AT Range of loft hatches is compatible with our entire range of residential loft ladders (AL2, AL3, AL3C). For more information on our loft ladders click here
Code:
AT35, 25 and 15 Technical Drawing
The lead times and delivery service are displayed against each product, just below the price. We will continue to send items on a Next working day delivery, but please accept delivery might take longer, this is out of our control.
Please note, for certain products and delivery zones we can offer AM deliveries and Saturday Deliveries, if available, you'll be able to select and pay for these options via the checkout.
Delivery Charges will be applied for deliveries to geographical areas represented as Zones C and D: This includes certain parts of Scotland, Scottish Islands, Northern Ireland, Channel Islands and IOM)
We only supply to Trade Account Customers in Zone E
Cancellations:- Any stock item which is cancelled after having been dispatched, but before you have received it will be subject to a minimum fee of £25.00 + VAT for parcels and a minimum of £70 + VAT for pallets. Bespoke (made to measure) orders cannot be cancelled once ordered.
Returns: You can return a standard product (most access panels, loft hatches, accessories and Steel / Aluminium Roof Hatches) within 14 days of receipt. Roof domes, Roof Lights, Glazed Roof Hatches and AOV Smoke Vents will be subject to a collection restocking fee. Please note Made to measure products cannot be returned. Click here to download a return form.