On this page5 sections
- Wood Iron Poles are the strongest structural support in Valheim: a grounded column stays stable to about 50 meters.
- They must start from the ground, a boulder or a tree; stacking them on
Stone does not reset stability. - Use
Iron as a hidden skeleton and attach cheaper 
Wood, Core Wood or Stone pieces to it. - Iron cannot go through portals, so ship bars to the build site and keep a Forge nearby.
- Cover exposed poles: rain decays them to 50% durability.
Why Wood Iron Poles Change Everything
If your roofs keep collapsing and nothing will go past two stories, the Wood Iron Pole is the fix. It is the single strongest structural support in Valheim. Regular Wood poles cap out around 16 meters and Core Wood around 24, but a column of Wood Iron Poles stays stable to about 50 meters from the ground.
That height opens up lighthouses, multi-story fortresses and cathedral-height great halls. The secret is the Iron material class: it has the highest maximum support in the game and the lowest stability loss per connection, in both directions. Each pole passes more support to the piece above than any other material.
You unlock them as soon as you smelt your first Iron. They sit under the Forge category in the Hammer menu, and many players scroll past them without realizing what they are.
IronMaterial · Swamp1 Iron per pole or beam; not teleportable, so ship it to the build site
- Weight
- 12
- Stack size
- 30
- Teleportable
- No
Wood Iron Structures Recipes
Many players scroll past Wood Iron Poles in the crafting menu, assuming they are just cosmetic wood pieces. They are not. They are the strongest structural support material in the entire game. If you have Iron and a Forge, check your building menu carefully.
Wood Iron Pole Properties
| Durability | 2000 |
| Size | 0x0x2 (2m vertical) |
| Support Type | Iron |
| Max Support | 1500 (grounded) |
| Min Support | 20 (breaks below this) |
| Vertical Loss | 1/13 per connection |
| Horizontal Loss | 1/13 per connection |
| Weak To | Chop (1.5x damage) |
| Resistant To | Pierce (0.5x damage) |
| Immune To | Poison, Spirit |
| Damaged by Rain | Yes (decays to 50%) |
Understanding Stability: Why Iron Dominates
Stability works like support flowing up from the ground. A piece touching the ground starts at its material's maximum support. Each connection loses a fraction based on the material's loss values, and a piece breaks when its support falls below the material's minimum.
How the materials compare
- Iron loses only 1/13 per connection, vertically and horizontally, so it is the only material that excels at both towers and long spans.
- Wood loses 1/8 vertically and a brutal 1/5 horizontally, topping out around 16 meters.
- Core Wood manages about 24 meters thanks to higher max support and lower vertical loss.
- Stone loses 100% on horizontal connections, which is why a Stone floor never extends sideways without support below.
Iron reaches roughly twice the height of Core Wood and about three times that of regular Wood.
Iron feeds everything attached to it
Pieces attached to Iron poles inherit their high support. Wood pieces fixed to an Iron pole high up still show blue or green, because the Iron passes along so much support. You never need to build everything from Iron: use it as the skeleton and attach cheaper materials.
Structural Material Comparison
| Stat | Wood | Core Wood (Hardwood) | Stone | Iron (Wood Iron) |
|---|---|---|---|---|
| Max Support | 100 | 140 | 1000 | 1500 |
| Min Support | 10 | 10 | 100 | 20 |
| Vertical Loss | 1/8 (12.5%) | 1/10 (10%) | 1/8 (12.5%) | 1/13 (7.7%) |
| Horizontal Loss | 1/5 (20%) | 1/6 (16.7%) | 1/1 (100%) | 1/13 (7.7%) |
| Max Vertical Height | ~16m | ~24m | ~16m | ~50m |
“Iron poles are the skeleton of every ambitious build. Use them as the frame, and let cheaper materials be the skin.
How to Use Wood Iron Poles Effectively
Start from the ground
The most important rule: Iron poles must start from the ground. Support is calculated along the whole chain from ground to piece. If a Stone pillar is already at 50% stability, an Iron pole placed on top starts from that remaining value, not a fresh 1500.
Run a core column
For tall builds, run a column of Iron poles straight up from the foundation, then attach floors, walls and decoration at each level. Floor tiles attached to Iron poles 30 meters up still glow blue. Above that, stability fades through green and yellow to red.
Horizontal beams
A single horizontal Wood Iron Beam can support roughly 15 Stone floor tiles or about 27 Wood floor tiles extending outward. That is ideal for bridges over water, wide throne rooms, and any clear span without a forest of pillars.
Hide the Iron
Veterans treat Iron as an invisible layer. Run poles up inside your walls, hide beams behind decorative panels, and let the visible surfaces be whatever fits your style: Stone fortress outside, Iron bones inside.
Building a Tall Structure with Iron Poles
- 1
Set up your Forge at the build site
- 2
Place Iron poles from ground level
Start your Iron pole column directly on the ground, a boulder, or a tree. These count as terrain and give the pole its maximum 1500 support value (blue color). Stack poles straight up, snapping each one on top of the last. Each pole is 2 meters tall, so 25 poles gets you to the full 50 meter height limit.
- 3
Attach floors and walls to the Iron frame
At each floor level, snap your floor tiles, walls, and other building pieces to the Iron poles. Wood pieces connected to well-supported Iron will show blue or green stability, letting you extend outward much further than without Iron reinforcement. Use horizontal Iron beams for extra-wide spans.
- 4
Protect against rain decay
Wood Iron Poles are damaged by rain, decaying to 50% durability when exposed. Encase exposed Iron poles in Stone walls or ensure they are covered by a roof. Stone does not decay in rain and acts as a perfect protective shell for your structural Iron. You can repair damaged poles with a Hammer at no material cost as long as a Forge is nearby.
Forge
Coal
Copper
WorkbenchIron poles can support Stone building pieces up to about 27 meters vertically. If you add horizontal Iron beams near the top, you can push that to roughly 29 meters. This means Iron is essential for any serious stone castle. Without it, stone maxes out at the same 16 meters as basic wood.
When to Use Iron Poles (and When Not To)
You do not need them early. Each pole costs 1 Iron and a tall tower can eat 25 or more bars. While you are still saving for an 
Iron Mace, Iron armor and an 
Iron Pickaxe, those bars are too precious for architecture.
For one or two stories, Core Wood poles are plenty: their 24-meter limit fits a comfortable base with a loft. Save Iron for:
- builds of three or more stories
- wide open interiors without support pillars
- tall towers
- treehouses extending far from the trunk
- stone construction above the basic 16-meter Stone limit
The right time
The sweet spot is after Bonemass, when repeated Sunken Crypt runs leave you swimming in Iron. By the Mountain it gets more common, and by the Plains you will likely have stacks sitting unused. Then the cost is trivial and you can build without compromise.
The treehouse exception
Indestructible trees count as terrain, so an Iron pole touching one starts at the full 1500 support. You can build huge platforms out from a single tree, carrying stone floors far beyond what other materials allow. For a great treehouse spot, a handful of Iron is well spent.
Wood Iron Pole: Pros and Cons
Pros
- Highest structural support in the game (1500 max)
- Reaches about 50 meters vertical, twice Core Wood and three times Wood
- Equal loss in vertical and horizontal (1/13 both ways)
- Reinforces stone to reach 27+ meters
- Enables massive open rooms without mid-floor supports
- 2000 durability makes them tough to destroy
Wood Iron Poles will decay to 50% durability when exposed to rain. For exterior columns, encase them in Stone walls or ensure they are fully covered by a roof. A 2000 durability pole at half health is still 1000 HP, but ongoing decay combined with enemy attacks can cause structural collapse. Always build your roof before relying on exposed Iron supports long-term.
Advanced Iron Pole Techniques
Hidden frame
The most common technique. Run vertical poles through the centers of Stone or Wood walls and Iron beams inside floors to span large rooms. The finished build looks like normal Stone or Wood, but an Iron skeleton allows heights and spans that would otherwise be impossible.
Bridges and over-water builds
A single horizontal beam supports about 15 Stone floor tiles outward, so you can build docks, bridges and elevated platforms without pillars in the water. For longer spans, add Iron beam supports every 5-6 floor tiles to keep stability blue or green.
Mixing materials does not reset limits
Placing Iron poles on a Stone tower never lets you exceed 50 meters total, and switching material mid-build resets nothing. The color indicator can mislead: a blue Wood piece on an Iron pole at 40 meters has less real support than a blue Wood piece on the ground.
Frequently Asked Questions
Can I transport Iron through Portals to build at remote locations?
No. Iron cannot pass through 
Portals. You need to transport Iron bars by boat or cart to your build site. A common strategy is to build a 
Smelter near the Swamp, smelt your 
Scrap Iron there, then sail the bars to wherever you need them. Alternatively, some players set up a secondary base near their Swamp with a Forge specifically for Iron construction projects.
How many Iron bars do I need for a tall tower?
Each Wood Iron Pole is 2 meters tall and costs 1 Iron. A 50-meter tower needs 25 poles per column, so 25 Iron for a single central column. A practical four-column tower frame needs about 100 Iron bars just for the vertical structure, plus more for horizontal beams at each floor. Budget 120-150 Iron for a serious multi-story build.
Do Iron poles support stone building pieces?
Yes, and this is one of their best uses. Iron poles can support Stone structures up to about 27 meters vertically. Without Iron reinforcement, Stone is limited to the same 16 meters as basic Wood. If you want a tall stone castle, Iron poles inside the walls are essential.
What is the difference between a Wood Iron Pole and a Wood Iron Beam?
They have identical stats, materials (2 Wood + 1 Iron), and durability (2000). The difference is orientation. The Pole is vertical (size 0x0x2), while the Beam is horizontal (size 0x2x0). There are also angled variants: the 45-degree beam (0x2x2) and 26-degree beam (0x2x1), both perfect for roof supports and diagonal bracing.
Wood Iron Pole Data
Exact values from the game files (version 1.0 (build 2026-09-17)).
Recent Updates
- Updated for Valheim 1.0: verified Iron and Forge data, corrected the height comparison with Core Wood, and reorganised the guide for easier reading.