Loft & Attic Ladders
One-handed lift, steady hold, and a light, controlled close for loft hatches and folding attic ladders — sized so the panel is easy to open and easy to pull shut from the steps.
- 1 The Hatch You Open Over Your Own Head
- 2 Where Gas Springs Go on Loft and Attic Ladders
- 3 One Spring or Two on a Loft Hatch
- 4 When to Specify Stainless Steel or Locking Gas Springs
- 5 Specification Quick-Reference by Hatch Type
- 6 How to Calculate Gas Spring Force for a Loft Ladder Hatch
- 7 Why Loft Ladder OEMs Source Hatch Springs from Newtone
- 8 Frequently Asked Questions
- 9 Conclusion
- 10 Get a Specification or Quote
The Hatch You Open Over Your Own Head
Gas springs for loft ladders solve a problem most people only notice when it is missing: a loft hatch is opened from directly below, often with one hand, while the other holds the loft-ladder cord — and the panel is overhead, swinging down toward the person opening it. A bare hinged hatch drops the moment the catch releases. A correctly sprung one floats down under control, holds itself open while the ladder is unfolded, and lets the user push it shut without standing on tiptoe fighting a stiff panel. The spring has two jobs that pull against each other: hold a panel up, and not be a wrestling match to close.
This page is for the people who design and supply that hardware: OEM engineers building loft hatches and folding attic ladder assemblies, procurement teams sourcing replacement springs for installed units, and distributors serving builders’ merchants and access-equipment fitters. The focus here is the balance between holding the hatch open and keeping the closing effort light — the trade-off that decides whether the product feels good in the hand.
Who this page is for: loft ladder and access-hardware OEM engineers specifying hatch counterbalance, procurement teams sourcing replacement springs for installed ladder kits, and distributors supplying builders’ merchants and access-equipment fitters.
Where Gas Springs Go on Loft and Attic Ladders
The spring almost always acts on the hatch panel rather than the ladder itself, but the type of hatch changes the weight and the closing geometry. Each version below is a different balance between hold and closing effort.
Standard Domestic Loft Hatches
Light timber or insulated panels hinged to drop down. The most common case, where the whole point is a soft, controlled fall and an easy push back up — closing effort matters more than raw holding force.
Insulated & Fire-Rated Hatches
Heavier panels with insulation cores or fire-resisting construction, common in newer builds and commercial lofts. The extra mass needs more force and usually two springs, but the closing force still has to stay manageable.
Concertina & Folding Ladder Hatches
Hatches integrated with a folding metal ladder assembly. The spring counterbalances the combined hatch-and-mechanism weight, so the centre of gravity sits differently than on a bare panel — worth a geometry check.
Commercial & Roof-Void Access Hatches
Larger access panels in commercial buildings and plant rooms, opened by maintenance staff. Heavier, more frequently used, and a candidate for a hold-open that stays put hands-free while someone climbs through.
One Spring or Two on a Loft Hatch
A narrow domestic hatch can sit on a single spring; a wide or heavy one should not. The deciding factor is whether the panel twists. One spring on a wide hatch lets the unsupported side lag, so the panel drops at an angle and racks in its frame — annoying on a timber hatch, a sealing problem on an insulated or fire-rated one. Two matched springs keep the descent level and share the load so each runs gently.
⬤ Single Spring Setup
- Narrow domestic hatches under ~8 kg (18 lb)
- Centred load, rigid panel
- Hinge mechanism shares the load
- Lower part count and cost
⬤ Paired Spring Setup
- Wide hatches and folding-ladder assemblies
- Insulated or fire-rated panels
- Even descent so the panel seats square
- Springs force-matched to ±5% from one batch
When to Specify Stainless Steel or Locking Gas Springs
For ordinary domestic loft hatches, a standard configuration is right: a black nitrided rod (900–1000 HV, 20–30 µm) with HNBR seals copes with normal indoor conditions and a long service life. The exception is the loft void itself, which can be humid and poorly ventilated — for hatches opening into damp, unconditioned roof spaces, or in coastal homes, a stainless steel gas spring resists the condensation that would slowly pit a standard rod. Most homes do not need it; damp lofts do.
Locking has a narrower place here. On a standard domestic hatch a well-sized standard gas spring that holds at the open angle is enough. On larger commercial roof-void access hatches, where maintenance staff climb through and want the panel to stay firmly open hands-free, a locking gas spring that holds at full extension until released is worth specifying. Match the release type to the hatch weight and how it is reached from the ladder.
Specification Quick-Reference by Hatch Type
| Hatch Type | Typical Weight | Recommended Force | Spring Count | Notes |
|---|---|---|---|---|
| Standard domestic loft hatch | 4–8 kg (9–18 lb) | 150–300 N (34–67 lbf) | 1 | Prioritise low closing force |
| Insulated / fire-rated hatch | 8–16 kg (18–35 lb) | 200–400 N each (45–90 lbf) | 2 | Heavier panel; check seal seats square |
| Folding-ladder hatch assembly | 10–20 kg (22–44 lb) | 250–450 N each (56–101 lbf) | 2 | Counterbalance combined CoG — geometry check |
| Commercial roof-void hatch | 12–25 kg (26–55 lb) | 300–550 N each (67–124 lbf) | 2 | Consider locking for hands-free hold |
| Damp / coastal loft void | Any of the above | Per type | Per type | Stainless recommended |
How to Calculate Gas Spring Force for a Loft Ladder Hatch
The most useful relationship for a loft hatch is the mounting-distance form, because the single biggest lever you have over the force needed is where the spring bracket sits relative to the hinge — and on a hatch frame you usually have some freedom to move it:
F = (W × L) ÷ d
F = total force needed · W = hatch weight (N) · L = hinge-to-CoG horizontal distance · d = perpendicular distance from hinge to the spring mount (larger d = less force)
Worked example — 10 kg (22 lb) loft hatch:
W = 10 × 9.81 = 98.1 N (22 lbf) · L = 350 mm (13.8 in) = 0.35 m · d = 70 mm (2.8 in) = 0.07 m
F = (98.1 × 0.35) ÷ 0.07 = 34.34 ÷ 0.07 = 491 N (110 lbf) total → on two springs, 245 N (55 lbf) each
Notice what the formula tells you: double the mount distance d and you halve the force needed. So before reaching for a stronger spring, move the bracket further from the hinge — it lowers cost and, just as important, lowers the closing force. That closing force is the second number to check: the held-open spring also resists the user on the way shut (F_close roughly tracks the spring force through the closing geometry), and the target is a value a person can push one-handed from a ladder. Add a modest safety factor of about 1.15, and where the hatch weight, ladder-assembly CoG, or mount position isn’t settled, confirm it with our engineering team rather than guess.
Mounting decides feel and life. Fit the spring rod-down in the closed position so the oil keeps the seals lubricated and the descent stays quiet and even. Use ball-socket or eyelet end fittings that allow a little angular play so the rod takes pure axial load — side-load is what wears a hatch spring out early. Keep both pivots in the same plane so the panel descends level, and use the mounting distance d, not a bigger spring, as your first tool to tune the force and the closing effort. As a starting point, set the moving pivot roughly a third of the panel length out from the hinge, then refine.
Why Loft Ladder OEMs Source Hatch Springs from Newtone
We manufacture in our own plant in Turkey, so force, stroke, and tolerance are ours to tune — which matters when the difference between a good loft hatch and a frustrating one is a clean balance between hold and closing effort.
Frequently Asked Questions
Use the mounting-distance form: force = hatch weight in newtons × hinge-to-centre-of-gravity distance, divided by the perpendicular distance from the hinge to the spring mount. A 10 kg (22 lb) hatch with the CoG 350 mm (14 in) from the hinge and the spring mounted 70 mm (2.8 in) out needs about 491 N (110 lbf) total, or 245 N (55 lbf) each on two springs. A larger mounting distance lowers the force needed.
Because the spring that holds the hatch open also resists you when you pull it shut. If it is over-sized, the closing hand force is high and the hatch fights you from a ladder. The fix is to size from the held-open force and check the residual closing force lands at a comfortable level, not to fit the strongest spring that holds the hatch up.
Narrow domestic loft hatches under about 8 kg (18 lb) often run on a single spring. Wider hatches and heavier insulated or fire-rated panels use two springs so the hatch lifts level and does not twist in its frame. When two are used, match them to within ±5% from the same batch so one side does not lead.
Mount it rod-down when the hatch is closed so oil keeps the seals lubricated and the motion stays quiet. Use ball-socket or eyelet fittings that allow slight angular play so the rod is not side-loaded, and keep both pivots in the same plane. Moving the lower pivot further from the hinge lowers the force needed and changes the feel more than re-rating the spring does.
Usually not. A loft hatch sits indoors, so a black nitrided rod with HNBR seals is sufficient for most homes. Stainless steel is worth specifying for loft spaces with high humidity or condensation, or where the hatch opens to an unconditioned, damp roof void.
Conclusion
A loft hatch spring is judged in the hand, not on a spec sheet. The panel opens overhead, one-handed, from a ladder, so it has to float down under control, hold while the ladder unfolds, and push shut without a fight. The recurring mistake is sizing only for the hold and ending up with a hatch that is easy to drop open but a wrestle to close — over-sprung, on the worst footing.
Newtone sizes these springs for both halves of the job: enough force to hold the panel steady, and a closing force light enough to manage one-handed from the steps. Matched pairs to ±5% keep wide and insulated hatches descending level, stainless is available for damp lofts, and the mounting geometry is used to tune the force before reaching for a bigger spring. Engineering support is available to set force, stroke, and mount position for a specific hatch.
Send us the hatch type, weight, hinge and mount geometry, and whether the loft is dry or damp. We’ll come back with a force recommendation, a datasheet, and a quote — usually within 5 business hours.
Get a Specification or Quote
Tell us your hatch weight, hinge-to-mount geometry, and whether it is a domestic or commercial loft. Our engineering team handles the rest — force calculation, closing-force check, material choice, and a configuration that feels right in the hand.
