Fitting a bed rail safely

Fitting a bed rail is not difficult. Fitting one and then confirming it is actually safe on your bed, with your mattress, takes a tape measure and about ten more minutes — and it is the part that matters. Here is the sequence.

Before you start

• Have the instructions, a tape measure, and a second person if the rail is heavy.
• Strip the bed to the fitted sheet. You need to see where the mattress actually meets the frame.
• Check the mattress fills the frame with no gap at the sides. If there is already a gap there, adding a rail does not fix it — it puts a barrier over it.
• Read the safety page if you have not. The measurements below make far more sense once you know what they are for.

Fitting

1. Position the rail where it is useful, not where it is easy. Sit on the edge of the bed as you actually do. The rail should be where your hand falls, and — if it is a full-length rail — should cover the length of your torso, not the whole mattress.
2. Anchor exactly as instructed. If a plate goes under the mattress, it goes under the mattress, not under the fitted sheet. If straps are supplied, use them; they are not optional packaging.
3. Tighten fully, then load it. Put real weight on the rail — lean on it hard, standing beside the bed. Anything that shifts now will shift at 3am.
4. Set any height adjustment before measuring, not after. Changing the height changes every gap you are about to measure.

Measuring, which is the actual job

Compare each measurement against the FDA's dimensional guidance. Take every one with the mattress compressed — press down firmly beside the rail with your free hand, the way a sleeping body would — because an empty mattress measures a gap that does not exist in use.

The extra checks for an adjustable base

Every gap you just measured is a measurement of the bed lying flat. An adjustable base does not spend the evening lying flat.

1. Raise the head to its steepest angle and re-measure all four gaps.
2. Raise the foot section and re-measure.
3. Return to flat and check the rail has not shifted or bound.
4. Confirm the rail does not obstruct the deck reaching flat. If the bed cannot lie flat with the rail fitted, the rail is wrong for that bed.

Rails for adjustable beds explains why the anchoring method is the root of most of these problems and which designs avoid it.

Re-check it later

Put a note somewhere. Re-measure after any mattress change, after any new mattress topper — a 3-inch topper changes the rail-to-mattress relationship completely — and every few months regardless. Mattresses soften, and a gap that was fine when the rail went on can grow without anyone deciding anything.

And re-check the height while you are there. The bed being at a workable height is what makes a rail a handhold rather than a lifeline. The measuring guide is here.