Sheet Metal Rust: HP, Cost & Upgrade Guide 2026

Updated for 2026

Every base in Rust lives or dies on one decision: how much of it you upgrade to sheet metal. It is the tier where a base stops looking like a suggestion and starts looking like a bad idea to raid, and it is the cheapest big jump in survivability the building system gives you.

Sheet metal is the third material grade you can build, sitting above stone and below armored. It doubles a block’s health to 1,000 HP, it takes zero fire damage, it needs no workbench and no blueprint, and it quietly costs you less in daily upkeep than the stone it replaces. That is a lot of upside for 200 metal fragments a wall.

This is the full guide to the whole tier: what sheet metal is, how to upgrade to it, what every piece costs, how it compares to the tiers around it, why fire and melee bounce off it, and where on your base the fragments actually belong. Where the deep raid maths lives on a dedicated page, we point you to it.

TL;DR Sheet metal is Rust’s third building grade. A full block (wall, floor, foundation, frame) has 1,000 HP, and a wall or foundation costs 200 metal fragments to upgrade to (floors and frames 100), with no workbench required. You upgrade by holding right-click with a Hammer and picking the grade from the wheel, and you can jump straight from twig. Sheet metal is immune to fire and hugely melee resistant, so only explosives raid it: a wall takes 4 C4. Decay is 8 hours with no tool cupboard and daily upkeep runs 20 to 66 fragments. Do not confuse the tier with the Sheet Metal component item, which is loot that recycles into 120 fragments.
Sheet metal Rust: a stone and sheet metal base under raid, the third building tier with 1,000 HP blocks
Sheet metal is the tier where the C4 bill starts to hurt a raider.

What is sheet metal in Rust?

Sheet metal is a building grade, not an item you place. Every building piece in Rust starts life as twig, and you upgrade it up a ladder of material grades: twig, wood, stone, sheet metal, then armored. Sheet metal is the fourth rung and the third one you actually pay materials to reach.

In game the grade is called Sheet Metal, which is why the same thing gets written as “metal tier”, “metal walls” and “sheet metal” depending on who is talking. It is unmistakable to look at: rusted, corrugated panels of slightly different shades riveted in overlapping sheets over a support frame.

Three facts define the whole tier, and they are the reason it is the most important upgrade decision in the game:

  • 1,000 HP per block. Exactly double a stone block, exactly half an armored one. That doubling is what moves a raider from “two C4 and I am in” to “four C4 and there is still honeycomb”.
  • No workbench, no blueprint. Building grades are not researched. If you have a hammer, the fragments and building privilege, you can build sheet metal on day one.
  • It does not burn. Sheet metal takes zero fire damage and enormous melee resistance, which kills two entire categories of cheap raiding stone was still exposed to.

Sheet metal stats

1,000HP per full block
200metal fragments
0fire damage taken
8 hdecay timer
StatValueNotes
Grade nameSheet MetalTier 4 of 5, above stone, below armored.
Health (full block)1,000 HPWall, floor, foundation, frame, roof.
Upgrade cost (wall)200 Metal FragmentsCut-out pieces cost a little less.
Workbench neededNoneHammer, materials and building privilege only.
Fire damageZeroImmune to flame turrets, molotovs, incendiary ammo.
Melee (pickaxe, hard side)345 hitsOffline melee raiding is effectively dead.
Upkeep20 to 66 fragments / 24 hScales with total base size.
Decay8 hoursFull health to destroyed, no tool cupboard.
C4 to break a wall4275 damage each.
Soft sideYes, melee and bullets onlyExplosives hit both faces identically.
These numbers have not moved Sheet metal has been 1,000 HP for a very long time, and nothing in recent patches has changed it. If a guide tells you 750, 800 or 1,250, it is either out of date or describing a modded server. You can sanity check any figure on this page against the Rust raid calculator on this site.

How to upgrade to sheet metal

Upgrading is one interaction. There is no crafting step, no bench, and no unlock. You place a piece, you point a hammer at it, and you pick the grade.

How to upgrade to sheet metal in Rust: build twig, hold right-click with the hammer, pick the metal grade, pay 200 metal fragments per wall
Twig to sheet metal in one hold of the right mouse button.
  1. Place the piece. Use the Building Plan to snap a wall, floor or foundation into a twig frame.
  2. Equip the Hammer and aim at the block you want to upgrade.
  3. Hold right-click. The upgrade wheel opens, offering every grade you can currently pay for. Grades you cannot afford are greyed out.
  4. Pick Sheet Metal. The fragments come straight out of your inventory and the block upgrades instantly.

You do not have to walk up the tiers one at a time. The wheel lets you jump twig straight to sheet metal in a single click and a single payment. Most experienced players throw up the whole shell in twig, then upgrade only the pieces that matter directly to their final grade.

You need building privilege You can only upgrade pieces inside the range of a tool cupboard you are authorised on. That is the same privilege that lets you place and repair, so if you can build there, you can upgrade there. A block outside any cupboard’s radius cannot be upgraded, only destroyed.

What sheet metal costs to build

Two hundred metal fragments for a wall. That is roughly a stack and a bit of metal ore through a furnace, and a single decent metal node plus a loop of barrels covers several walls. Metal ore is also denser to carry than the stone a stone wall wants.

Upgrading never refunds the lower grade Going from stone to sheet metal costs the full 200 fragments. The 300 stone you already spent is gone, and so is the 200 wood before it. Rust never gives materials back when you upgrade, which means a wall built the slow way costs 200 wood plus 300 stone plus 200 fragments. If you know a wall is ending up metal, take it straight from twig to sheet metal and skip the tiers in between.

Where do the fragments come from? Smelt metal ore in any furnace, recycle components at a recycler (road signs, gears and the Sheet Metal component all pay out fragments), or run a quarry. For a metal base you want a steady fragment income, not a one-off pile, because upkeep is charged in fragments too the moment you go metal.

Every sheet metal piece, health and cost

Almost every full sheet metal block is 1,000 HP. What changes is the price: floors, wall frames, low walls and roofs cost 100 fragments, and pieces with a hole in them cost slightly less than a wall.

Rust sheet metal building pieces: every full piece is 1,000 HP; walls and foundations cost 200 metal fragments, floors, frames and low walls 100, doorways and windows a little less
Full blocks are 1,000 HP. Cut-outs cost a touch less to upgrade.
PieceHealthUpgrade cost
Wall1,000 HP200 Metal Fragments
Foundation1,000 HP200 Metal Fragments
Floor / Ceiling1,000 HP100 Metal Fragments
Wall Frame1,000 HP100 Metal Fragments
Doorway1,000 HPSlightly less (cut-out)
Window Wall1,000 HPSlightly less (cut-out)
Half / Low Wall1,000 HP200 / 100 Metal Fragments
Stairs (L / U)1,000 HPAround a wall

The practical takeaway is that a full sheet metal base is cheaper than “200 times the number of pieces” makes it sound, because floors, frames, low walls, doorways and windows all sit below the wall price. It is the wall that sets the ceiling.

The piece is only as strong as what fills it A sheet metal wall is 1,000 HP, but the sheet metal door, window bars or embrasure that fill its opening have their own, much lower health. Raiders always attack the cheapest thing on the path, so a 1,000 HP frame with a soft insert is a 1,000 HP frame in name only. Match the insert to the frame.

The five building tiers compared

Here is where sheet metal sits against every other grade. Health, upgrade cost, and the C4 bill for a wall of each.

Rust building tiers compared: twig 10 HP, wood 250, stone 500, sheet metal 1,000 for 200 metal fragments, armored 2,000
Every building grade in Rust. Sheet metal is the value jump.
GradeHealthUpgrade costC4 (wall)Decay
Twig10Free build state11 hour
Wood250200 Wood13 hours
Stone500300 Stone25 hours
Sheet Metal1,000200 Metal Frags48 hours
Armored2,00025 HQM812 hours

The jump that matters most is stone to metal. Not for the raw health alone, but because it doubles the entry price and turns off fire and melee at the same time. A stone base is two C4 and a molotov story. A metal base is four C4 and nothing else, and that difference is what makes raiders scroll past.

Sheet metal vs stone vs armored

Stone is cheap and free-ish to farm. Armored is the hardest wall in the game. Sheet metal sits between them, and for most players most of the time it is the correct answer.

Rust building tier comparison: stone 500 HP vs sheet metal 1,000 HP vs armored 2,000 HP, cost, C4 and decay
Sheet metal is the sweet spot. Armored is for a core, not a shell.

Stone keeps a soft side you can pickaxe through in about 90 hits, and it burns to nothing under a flamethrower. It is what your outer honeycomb should be, because honeycomb only exists to be chewed.

Sheet metal doubles the health, kills fire and melee raiding, and, as the upkeep section shows, actually costs fewer daily units than stone. The only real price is that fragments have competing uses and stone does not.

Armored doubles health again to 2,000 for 25 high quality metal, which is excellent per wall. The catch is that HQM is the hardest resource to farm at volume and armored upkeep is billed in HQM too. Almost nobody runs a full armored base. They run a sheet metal base with an armored core, the same way they run a armored door in a sheet metal wall.

Fire, melee and the soft side

This is the property that separates the metal tier from everything below it. Wood burns. Stone has a soft side you can mine. Sheet metal shrugs off both.

Sheet metal in Rust takes zero fire damage and 345 pickaxe hits on the hard side, immune to fire and highly melee resistant
Zero fire damage and 345 pickaxe hits. Guns and flame do nothing.

Fire does nothing. A sheet metal wall takes zero damage from flame turrets, molotovs, incendiary rockets, incendiary ammo and fire arrows. Every one of those tools that opens a wooden door for pennies is dead weight against metal.

Melee is a rounding error. A pickaxe needs 345 hits on the hard side of a metal wall, and a jackhammer still needs hundreds. That effectively ends offline melee raiding as a threat, with one exception below.

Bullets do not raid it. A standard 5.56 round does about 0.0025 damage to the hard side of a metal wall. You would need hundreds of thousands. Only explosive 5.56 counts, and even that is a raid tool, not gunfire.

The soft side only matters for melee Every block has a soft side, the face with the visible support struts, and it must point inwards. On sheet metal the soft side does nothing at all against explosives, C4 and rockets deal identical damage to both faces. What it changes is melee: a pickaxe drops from 345 hits on the hard side to about 35 on the soft side. A backwards exterior wall is the one thing that makes melee raiding a metal base viable, so check your struts before you log off.

How to raid sheet metal

Because fire, melee and gunfire are off the table, raiding sheet metal means one thing: explosives. The exact counts depend on the piece, and we keep the deep maths on the dedicated pages so it stays current.

TargetC4Cheapest realistic route
Sheet metal wall43 C4 + 70 explosive 5.56 (8,350 sulfur)
Sheet metal floor / foundation4Same as a wall, 1,000 HP
Sheet metal door14 satchels, often cheaper than a wall
Garage door2The stronger door option in a metal wall

The headline for a wall is four C4, but the cheapest carryable route is three C4 plus about 70 rounds of explosive ammo for 8,350 sulfur, which beats four straight C4 by 450 sulfur per wall. The full breakdown, including rockets, satchels, beancans and siege weapons, lives in the metal wall guide and the Rust explosives overview.

Raid the cheapest piece, not the strongest A raider prices the whole path and attacks the softest link. If your sheet metal wall sits next to a wooden door or a plain window, that is where the raid goes, and your 1,000 HP wall never gets touched. This is the entire reason the “match the insert to the frame” rule exists.

Sheet metal upkeep and decay

This is the section that changes minds. Sheet metal is not just tougher than stone, it is cheaper to keep.

GradeUpkeep per 24 hDecay timeHealth
Wood20 to 66 Wood3 hours250
Stone30 to 99 Stone5 hours500
Sheet Metal20 to 66 Metal Fragments8 hours1,000
Armored3 to 8 HQM12 hours2,000

A stone wall bills up to 99 stone a day. A metal wall bills up to 66 fragments. You get double the health for a third fewer upkeep units. The only reason to hold off is that early on your stone is genuinely free while your fragments have a queue of other uses.

Decay runs 5 hours to 8 hours. If your tool cupboard runs dry while you sleep, a stone base has five hours of life left and a metal base has eight. Those three hours are often the difference between logging in to a base and logging in to a foundation. The full upkeep and decay mechanic is covered in the tool cupboard guide.

Switch your cupboard over the day you go metal Upkeep is charged in the material of the piece. The moment you upgrade to sheet metal, the tool cupboard starts asking for fragments, not stone. Plenty of bases have decayed because the cupboard was still stocked with stone and nobody noticed the fragment slot had run dry.

Where sheet metal actually belongs

Having the fragments is not the same as knowing where to spend them. The most common building mistake in Rust is metalling the outside first.

Rust base strategy: a stone honeycomb shell around a sheet metal loot room core with an armored last wall
Stone shell, metal core. Nothing on the outside advertises the loot.

A metal exterior is a billboard. Everyone on the server can read it from a hill. It says two things at once: someone in here has fragments to spare, and this base is worth more than the two C4 a stone base would cost. Plenty of raids happen purely because a base looked expensive.

  1. Stone shell. Keep the outer walls and honeycomb in stone. It looks like every other base on the map, and honeycomb only exists to be broken.
  2. Metal core. Upgrade the loot room, the airlock and the walls immediately around your tool cupboard to sheet metal. That is where the C4 bill needs to bite.
  3. Armored the last layer. If you have the HQM, the single wall between the raider and the boxes is the one worth 2,000 health.

The effect is that a raider pays a stone price to get in, then discovers the expensive part starts after they have committed their charges. That is when raids get abandoned halfway.

Building for the next wipe? Do not sink fragments into a base you are about to lose. Check exactly how long you have left before the next force wipe.

Force wipe countdown

The Sheet Metal component item (not the tier)

Search “sheet metal” in Rust and you get two different things. One is the building grade this whole guide is about. The other is a loot component literally named Sheet Metal, and they are not the same.

The Sheet Metal component item in Rust recycles into 120 metal fragments and is sold at Outpost, not the building grade
The component is scrap fuel. It recycles into fragments, it does not build walls.

The Sheet Metal component is a stack of corrugated panels you find in crates and barrels. You never place it. What you do with it is recycle it: one Sheet Metal item gives 120 metal fragments at a normal recycler, or 80 at a safe zone recycler, plus a little scrap. It is also sold at Outpost for around 30 scrap.

So the two are linked in a neat loop: the component recycles into the fragments you spend on the grade. If a guide tells you to “craft sheet metal to build a wall”, it has confused the two. You build the grade with fragments, and the component is just one of the ways to get those fragments.

Five sheet metal mistakes that cost people bases

  1. Metalling the shell instead of the core. You paid extra to advertise your loot room. Stone outside, metal inside.
  2. Walking up the tiers. Wood then stone then metal wastes 200 wood and 300 stone you never get back. Go twig to sheet metal in one hop for anything you know is ending up metal.
  3. A cheap insert in a metal frame. A wooden door or plain window in a 1,000 HP wall means the wall is decoration. Raiders price the cheapest route.
  4. Soft side facing out. It does nothing against C4, but it turns a 345 hit wall into a 35 hit pickaxe job. Check exterior struts before you log off.
  5. Forgetting upkeep is in fragments now. The cupboard needs metal fragments the moment you go metal. A stocked-with-stone cupboard on a metal base is a base on a timer.

Sheet metal Rust FAQ

What is sheet metal in Rust?
Sheet metal is the third building material grade you can upgrade to, sitting above stone and below armored. Full sheet metal blocks have 1,000 HP and cost 200 metal fragments to upgrade to, with no workbench or blueprint required. It is immune to fire and highly resistant to melee, so only explosives can raid it.
How much HP does sheet metal have in Rust?
One thousand health for a full block, which covers walls, floors, foundations, wall frames and roofs. That is exactly double a stone block and half an armored one. Half walls and low walls have the full 1,000 HP too. The figure has not changed in years, so guides quoting 750 or 800 are out of date.
How do you get sheet metal in Rust?
Sheet metal is a building grade, so you do not craft or find it. You place a piece in twig, hold right-click with a Hammer to open the upgrade wheel, pick the Sheet Metal grade, and pay the metal fragments. There is no research and no workbench. The separate Sheet Metal component item, which recycles into fragments, is found in crates or bought at Outpost.
How much does sheet metal cost to build in Rust?
Two hundred metal fragments per wall. Foundations and half walls are also 200, floors, wall frames and low walls are 100, triangle floors are 50, and doorways and window walls cost slightly less because of the cut-out. Upgrading never refunds the wood or stone already spent on lower grades, so build straight to sheet metal if you know a piece is ending up metal.
Does sheet metal need a workbench in Rust?
No. Building grade upgrades are not blueprints, so there is nothing to research and no workbench to build. You only need a Hammer, the metal fragments and building privilege from a tool cupboard. This is why a small solo base can be sheet metal well before it has a Workbench Level 2.
Is sheet metal fireproof in Rust?
Yes. Sheet metal takes zero fire damage. Flame turrets, molotovs, incendiary rockets, incendiary ammo and fire arrows all do nothing to it. This is one of the biggest advantages over wood, which burns, and it means fire-based raiding tools are dead weight against a metal base.
How many C4 for sheet metal in Rust?
Four C4 for a full 1,000 HP block such as a wall, floor or foundation. Each Timed Explosive Charge deals 275 damage, so three take a wall to 175 health and the fourth finishes it. You can save sulfur by using three C4 plus roughly 70 explosive 5.56 rounds. A sheet metal door is much softer at one C4 or four satchels.
Is sheet metal better than stone in Rust?
Yes, and the upkeep is the reason people miss it. Sheet metal doubles a stone block’s health from 500 to 1,000, doubles the C4 bill from two to four, adds immunity to fire, and extends decay from five hours to eight, while daily upkeep drops from up to 99 stone to up to 66 fragments. The only real cost is that fragments have competing uses and stone does not.
How long does sheet metal take to decay in Rust?
Eight hours from full health to destroyed once the tool cupboard runs out of upkeep or the piece sits outside building privilege. That compares with three hours for wood, five for stone and twelve for armored. Decay only starts after the upkeep grace period ends, so a well stocked cupboard stops it entirely.
Which side of a sheet metal wall is the soft side?
The face with the visible support struts crossing the panels. It must always point inwards, into your base. Explosives deal identical damage to both faces, so the soft side does not change your C4 or rocket bill, but melee tools do about ten times the damage to it. A pickaxe needs 345 hits on the hard side and about 35 on the soft side.
Is the Sheet Metal item the same as the building grade?
No. The Sheet Metal component is a loot item found in crates and barrels that recycles into 120 metal fragments at a normal recycler, or 80 at a safe zone recycler, and sells at Outpost for around 30 scrap. You cannot place it as a wall. The building grade is upgraded with fragments using a hammer, and the component is simply one source of those fragments.
Can you upgrade straight from twig to sheet metal?
Yes. The hammer upgrade wheel offers every grade you can currently afford, so you can jump from twig directly to sheet metal in one interaction and one payment, skipping wood and stone entirely. Because Rust never refunds a lower grade, this is the cheapest way to reach metal on any piece you already know will end up there.
Is there a high external sheet metal wall in Rust?
No. Rust only has a High External Wooden Wall and a High External Stone Wall. There has never been a metal or armored external wall. For a genuinely hard perimeter the answer is a real building block shell upgraded to sheet metal, with external walls used only to stop people casually walking up to your door.

Final thoughts

Sheet metal is the tier where a Rust base becomes a real problem to raid. Two hundred fragments a block for double the health, immunity to fire, near-immunity to melee, three extra hours of decay protection and a lower daily upkeep count is the best trade in the whole building system, and almost every player who gets wiped early got wiped in stone.

Spend the fragments inward, keep the struts pointing indoors, match every door and window to the wall beside it, and stock the cupboard with fragments before it runs dry. Then check the countdown, because none of it matters if the wipe lands on Thursday.

Sources and further reading