What a hallway hook has to hold before it fails

Hooks fail for a boring reason: nobody works out the load. The coat on the peg is not the load. The load is the heaviest thing that will ever be slung at that hook by somebody in a hurry, wet, with a bag in the other hand. Here are the actual numbers, and the way to find out whether your hook survives them before it drops your coat in the hall.

Weigh the things, it takes two minutes

Stand on bathroom scales holding the item, then without it, and take the difference. Or clip a luggage scale to the handle. Either way you now have a real number instead of a feeling, and the numbers usually surprise people in one direction: bags are heavier than coats.

As a guide to what you are likely to find: a wool overcoat is commonly somewhere between 1.5kg and 2.5kg. A leather biker jacket is in the same range and sometimes more. A quilted parka is lighter than it looks, often 1kg to 1.8kg, because the bulk is air. A tote with a laptop, a charger, a water bottle and a book lands around 4kg to 6kg. A packed gym bag or a loaded backpack is routinely 6kg to 9kg.

That last figure is the one that matters, because a bag is what gets hung on a hook that was chosen for a coat. If somebody in the house carries a backpack or a work bag daily, size every hook for the bag.

Wet changes the number, and the duration

Wool is good at holding moisture, which is why a wool coat still feels warm in drizzle. The flip side is that a soaked wool coat can arrive home carrying a noticeable amount of water: enough to add a kilogram or more to a heavy coat. If you want your own figure, weigh the coat dry, weigh it after a wet walk, and keep the number.

The second effect of wet is time. A dry coat goes on the hook and comes off a few hours later. A soaked coat hangs there all evening, at its heaviest, dripping. Sustained load is what finds a marginal fixing, because plasterboard anchors and adhesives both creep: they give slowly under a constant pull in a way they never do under a brief one.

If your hallway regularly takes wet coats, that is an argument for a floor-standing rail or a drip tray rather than for a stronger hook.

Nobody hangs one thing on one hook

Hooks are not loaded evenly. The one nearest the door takes everything, and in most households the end hook ends up with two or three coats, a scarf and a tote. A six hook rail does not divide its load by six.

So do the arithmetic for the worst hook, not the average one. If two winter coats and a bag can plausibly end up on the same peg, that is 10kg to 12kg on one fixing, which is a completely different problem from the 2kg you were picturing.

There is a design answer: give the hook you know will be overloaded the best fixing, and put it where the structure is, rather than spacing hooks evenly and hoping. Rails with several hooks spread the load across their own fixings, but only if every fixing is sound. One failed fixing on a rail puts the whole load on the remaining ones in exactly the position that levers them out.

Shock loading is what actually breaks things

A static 6kg bag and a 6kg bag swung onto a hook from half a metre are not the same event. Stopping a moving mass quickly takes much more force than holding it still, and a bag thrown at a hook can momentarily exert several times its own weight. Nobody puts their bag down gently in a hallway.

Add the other dynamic loads a hallway sees. People lean on rails to take boots off. Children hang off them, which is a point load with a person's whole weight on it. A coat gets yanked off without lifting it clear, which pulls down and out at once.

The practical allowance is a safety factor of three to four times the heaviest real static load. If the worst case is a 6kg bag, you want a fixing arrangement good for something like 20kg to 25kg. That sounds excessive until you have watched a fixing come out of plasterboard with a coat still attached.

The five ways a hook fails

The fixing pulls out of the wall. This is the common one, and it is a wall problem rather than a hook problem. It usually happens to the top fixing first, for reasons worth understanding properly.

The screw head pulls through the hook. Thin pressed steel with a countersunk hole will deform around the screw and let go while the fixing is still perfectly sound. Check the metal around the holes, not just the metal in the shank.

The hook itself bends or breaks. Steel bends, which gives you warning. Cast iron does not bend: it is strong but brittle, so it takes a serious load and then snaps with no warning at all. Cast hooks are excellent, as long as you have not already cracked one by over-tightening the screws.

The rail flexes. A long thin rail with the load at one end bows, and the bowing levers the end fixings out. And the fifth, which is a failure even though nothing breaks: the hook is too shallow or too smooth, and coats slide off it onto the floor. A hook with an upturned tip holds a loop of fabric that a straight peg does not. A cast rail with distinct hooks holds things better than a flat row of knobs for exactly this reason.

Test it before you trust it

Hang a known weight on the finished installation and leave it there. Two five litre water containers are 10kg and cost nothing. Hang them for an hour, then look closely: hairline cracking in the paint around the fixings, a dimple in the plasterboard, the rail standing slightly away from the wall at the top. Any of those means the fixing is working and will eventually let go.

For a quick pull test, hook a luggage scale over the hook and pull down and outward, which is the direction that actually matters, until you reach three times your worst case. Do it before the hallway is full of coats, not after.

Then check it again in six months. Creep is slow, and the whole point of a sustained load is that it does its damage while you are not watching. A hook that has pulled out 2mm and stopped is telling you something.

Buying for the direction of the load

Look for two fixing holes, vertically separated, not one. A single screw lets the hook rotate under load, and a rotating hook works its own fixing loose. Look for thickness around the holes. Look for an upturned tip. Look at the projection: a hook that stands 110mm off the wall holds a coat nicely and multiplies the leverage on the top fixing, so a shorter projection is kinder to the wall.

For small loads, the shape matters more than the strength. Keys, a lead, a tote and a cap do not need engineering, and smaller cast hooks are fine for that work. For coats and bags, buy for the fixings and the projection first and the look second.

The last point is the honest one: a good hook on a bad fixing fails, and a mediocre hook on a sound fixing does not. Which is the subject of the next article.

Questions people actually ask

How much weight does a coat hook need to hold?

Work out the heaviest realistic load for the busiest hook, which is often a 6kg to 9kg bag rather than a coat, then allow three to four times that for shock loading. A hook people will sling a loaded backpack onto wants a fixing arrangement good for roughly 20kg to 25kg.

How much does a wet wool coat weigh?

A heavy wool overcoat is commonly 1.5kg to 2.5kg dry, and a soaked one can carry enough water to add a kilogram or more. It also hangs at that weight for hours, and sustained load is what finds a marginal fixing.

Why do coat hooks pull out of the wall?

Because a coat hangs out from the wall rather than flat against it, so the load tries to rotate the hook off the wall and pulls the top fixing straight out. Plasterboard has very little resistance to that, and the pull is multiplied by how far the hook projects.