Rimworld Roof Collapse Size: Essential Guide and Tips

Last updated on February 19, 2024

Collapsing roofs in Rimworld cause significant damage, making understanding roof collapse size vital because it determines how to build and protect your colony effectively.

Navigating the intricacies of roofing in RimWorld ensures the safety and efficiency of your colony’s structures. Understanding the critical 6.4-tile radius for stability is the linchpin in preventing disastrous collapses and optimizing your shelter’s span.

Whether leveraging the natural support of overhead mountains, cognizant of their risks, or strategically placing support beams, this article provides the essential guidelines for secure and expansive roofing.

Planning your build with foresightedness can safeguard against the perils of cave-ins, and with the aid of the game’s planning tool, you’ll master the art of safe roof construction.

The knowledge laid out here is indispensable for both novice architects and seasoned builders seeking to perfect their RimWorld sanctuaries.

Key takeaways:

  • Roofs require walls or pillars within a 6.4-tile radius for stability.
  • Maximum unsupported roof span is 6.4 tiles from any support.
  • Overhead mountains provide stability but can spawn infestations.
  • Strategic placement of support beams and columns maximizes roof coverage.
  • Use planning tool to visualize safe roof spans and prevent collapses.

Understanding RimWorld Roof Support Structure

understanding rimworld roof support structure

In RimWorld, the stability of roofs relies on properly placed support structures. A fundamental aspect to grasp is that roofs require walls or pillars within a 6.4-tile radius to remain stable—any span of roofing beyond this distance risks collapse. Thus, a roof can extend 6 tiles from a wall or support before needing additional support.

When dealing with overhead mountains, stability is inherent, and such roofs won’t collapse regardless of span. However, it’s still crucial to be cautious as these areas come with their own set of challenges.

It’s important to strategically place support beams and columns to maximize the covered area without wasting materials or risking structural integrity. This often involves planning your layout to leverage walls as natural supports and adding beams where large rooms or open spaces necessitate extra reinforcement. When expanding your base, consider how new walls can serve dual purposes as room dividers and roof supports to create safe and efficient spaces.

Maximum Unsupported Roof Span

maximum unsupported roof span

In RimWorld, the basic rule for roofing is the 6.4-tile span from any wall or support column; this is often referred to as the “radius” of support.

Roofs will automatically collapse if they extend beyond this safe span because they lack the necessary structural support.

It’s important to measure your interiors to ensure that any point of the roofed area is within 6.4 tiles of a wall or column.

If expanding a room or constructing a large building, plan to include additional supports accordingly.

Note that constructed roofs and thin rock roofs require supports, whereas thick mountain roofs, which are created by mining out rock, do not collapse regardless of the span.

However, removing too many natural supports from a thick roof area can lead to instability and eventual collapse.

Overhead Mountain Mechanic and Roof Stability

In RimWorld, an overhead mountain roof type is naturally occurring and cannot be constructed or removed by players. These mountainous areas present unique challenges when compared to constructed roofs due to their immunity to collapse from a lack of support. This makes them a potential haven against mortar and other aerial attacks.

However, stability comes with inherent risks. Overhead mountains have a higher likelihood of spawning infestations, dangerous events where insectoid creatures burrow out from the rock. For this reason, careful management of these areas is crucial.

To ensure stability when excavating underneath overhead mountains:

  • Regularly place walls or columns as support when creating large rooms to mitigate the infestation risk by breaking up the open space.
  • Avoid hollowing out areas larger than necessary to reduce the surface area where insects might spawn.
  • Incorporate pre-existing walls into your base design where possible, as natural rock has a high durability.

By understanding and respecting the unique properties of overhead mountain areas, players can skillfully integrate them into their base designs for strategic advantage while managing the associated threats.

Support Beam and Column Placement for Optimal Roof Coverage

To achieve optimal roof coverage in RimWorld, strategic placement of support beams and columns is crucial. Here’s what you need to know:

  • Distance Between Supports: Support structures, including natural rock walls, constructed walls, or columns, must be placed within 6 tiles of each other to prevent the roof from collapsing. This creates a 12-tile diameter of a safe roofing area with the support in the center.

Utilizing Existing Structures: Whenever possible, integrate natural rock formations or pre-existing walls into your roofing plans to minimize material costs and labor time.

Underground Expansion Planning: When expanding underground bases within mountains, preemptively place columns as you dig to support the new roofing areas. This avoids accidental collapses that can occur from removing too much rock without adequate support.

Column Efficiency: Although walls serve as excellent support, columns are more material-efficient when sole support is needed. They occupy only one tile and allow passage, making them perfect for maintaining open spaces within your base.

Remember, careful planning and knowledge of these key points can keep your colonists safe from unexpected roof collapses.

Calculating Safe Roof Collapse Distances

To ensure the safety of your colonists and the integrity of your structures, it’s crucial to monitor roof collapse distances. RimWorld’s basic guideline is that any roof section must be within 6.4 tiles of a wall or support—in other words, the maximum span of unsupported roofing is approximately 6 tiles from any support point. Beyond this threshold, the risk of collapse increases significantly.

Here are some practical points to consider:

  • Walls as Supports: Incorporate walls within your designs that can double as room partitions while providing the necessary roof support.
  • Planning Tool Utility: Utilize the planning tool to mark out where your supports will be placed before building; this is an excellent way to visualize the maximum safe spans.
  • Regular Checks: Periodically check your roofing spans, especially after expansions or alterations to structures, to ensure they haven’t exceeded safe limits.
  • Mining Cautions: Always brace the roofs when mining by strategically leaving or adding pillars, especially when working under an overhead mountain where roof collapse can be fatal.

Remember, the stability of your roof not only provides safety for your colonists but also ensures the protection of your resources and infrastructure from exposure to the elements and potential raiders.

Clear Understanding of the 6.4-Tile Rule

The 6.4-tile rule is pivotal for ensuring the stability of your constructions. It dictates that any roof section must be within 6.4 tiles of a wall or strong support to remain standing.

Here are essential points illustrating this rule:

  • Roofs can extend up to 6.4 tiles away from a support, such as a wall or pillar. Beyond this reach, they risk collapsing.
  • This distance is calculated in a straight line from the closest support, not diagonally.
  • When planning large rooms, place intermittent supports to prevent any portion of the roof from exceeding the critical distance.
  • Visualizing this rule is simplified by paying attention to when the in-game cursor changes from green to yellow while placing roofs, indicating a nearing limit.
  • If you want to create open spaces without internal supports, consider breaking the area into smaller, well-supported rooms.

Keep these points in mind, as effectively applying this knowledge can ensure the safety of both your structures and colonists.

Role of Walls in Preventing Roof Collapse

Walls are a structural backbone in RimWorld, providing essential support for roof spans. They serve as the primary means to prevent collapses, effectively holding up the roof in areas beyond the 6.4-tile span limit.

Direct Support: Every wall block directly supports an adjacent roof. This is invaluable in large rooms where pillars are impractical.

Perimeter Guarding: Building walls around the perimeter of a structure ensures that any roof within the confines is secure.

Material Matters: The durability of the wall matters; stone walls can bear more weight and are less susceptible to fire or raid damage, leading to a more stable roof structure compared to wood.

Strategic Placement: Positioning walls in calculated intervals breaks up expansive areas, allowing for larger, open interiors without the danger of collapse.

By integrating walls at strategic points within your base, you can extend the reach of your roof and create larger rooms without risking structural integrity.

Preventing Roof Collapses During Construction

To thwart roof collapses while expanding your RimWorld base, adhere to these constructive practices:

Begin with a solid plan: Use RimWorld’s planning tool to outline your structures. It visualizes where support columns and walls should be, ensuring a safe distance from each endpoint.

Construct in phases: Build small sections at a time, immediately establishing support structures before expanding. This minimizes the risk of accidental collapses.

Utilize existing walls: When possible, build adjacent to existing walls. They serve as ready-made supports for new roofing, limiting the need for additional structures.

Monitor construction progress: Keep an eye on partially completed buildings. Unfinished projects can lead to hazardous unsupported areas as your colony grows.

Prioritize stability: Even if it requires additional resources, prioritize the installation of walls and pillars during construction. A sturdy infrastructure prevents future hazards.

Sequential Building Techniques

When expanding your base with additional roofing, take a gradual approach to ensure safety and structural integrity:

1. Plan Ahead: Use the planning tool to mark out the area you intend to cover, arranging future walls and supports.

2. Stage Your Construction: Begin by building the outer walls, followed by any necessary internal support before adding the roof.

3. Small Sections: Work on small roof sections at a time, especially if covering large areas, to avoid accidental collapses.

4. Immediate Support: As soon as a roof segment is added, make sure it is within the safe span limit by promptly constructing support structures.

5. Monitor Roof Thickness: Keep an eye on the roof thickness indicator when building inside mountains, as thin rock roofs can collapse easily.

6. Expansion Joints: Consider leaving temporary gaps in walls during expansion to create ‘expansion joints’, giving you time to add supports without risking large sections.

By adopting a methodical building method, you can extend your structures safely and efficiently, mitigating the risk of roof collapse disasters.

Using the Planning Tool for Safe Construction

Leverage RimWorld’s planning tool effectively to forecast your construction projects and map out necessary support structures.

By plotting the blueprint of future buildings, you’re able to visualize the maximum span of roof without support, keeping it within the safe 6.4-tile distance from walls or pillars.

Start by drawing the perimeter where walls will stand and then from each corner measure outwards to mark where additional support columns may be necessary.

Use different colors to distinguish between existing structures and planned ones, thereby ensuring clarity in your project.

This preemptive step is crucial to minimizing the risk of roof collapses, allowing you to proceed with building in confidence.

Remember, these plans can always be adjusted before actual construction begins, providing flexibility for optimizing layout and support.

Roof Collapse Warnings and Signs

RimWorld alerts players to potential roof collapses through an in-game warning system. Pay attention to notifications indicating areas are too far from a supporting wall or column. These warnings usually appear as yellow or red exclamation marks, signaling immediate action is required to prevent a collapse.

Visually, players can detect precarious roofing by the presence of thin rock roofs over large, open areas devoid of support structures. It’s important to observe roof types; while constructed roofs can be removed safely, thick stone roofs resulting from mining overhead mountains present a potential hazard and cannot be removed.

During construction, always watch for the automatic formation of roofed areas. The game tends to auto-roof any constructed enclosed space, which can inadvertently trigger collapses if the space is too large and poorly supported. Use the “remove roof” area tool proactively to designate areas where roofing should not be auto-generated.

In-Game Warning System

RimWorld features an intuitive warning system to alert players of potential roof collapses. When a roof is at risk due to improper support, a yellow triangle with an exclamation mark appears, prompting builders to take action. The alert indicates that the roof span has exceeded safe limits and requires additional support to prevent a sudden collapse.

Regularly checking for these warnings during construction prevents accidental deaths or injuries to colonists. It’s important to immediately address any warnings received by either building new columns or walls to support the roof or by deconstructing the unstable sections before they cause harm.

Visual Cues for Dangerous Roof Areas

In RimWorld, players must keep an eye out for visual indicators signaling potential roof instability:

1. Cursor Feedback: Hovering over a roofed area will prompt your cursor to display the roof icon. The absence of this icon in expected places may indicate a roof beyond its safe span.

2. Wall Proximity: Notice gaps between walls and overhead roofs. Larger gaps typically mean higher risk of collapse.

3. Color Coding: The build roof area is color-coded in blue when designated. If you see patches without the blue overlay within a roofed zone, those are unsupported and at risk.

4. Rubble and Debris: Debris under a roof can suggest previous collapses, signaling caution ahead in that zone.

5. Audio Cues: Creaking noises within rooms can be a forewarning; constant awareness of in-game sounds is crucial.

By recognizing these signs, players can preemptively address risky areas to maintain a stable and safe colony.

Understanding RimWorld Roofing Materials

In RimWorld, the type of roofing material does not affect structural integrity; all types provide the same level of support. However, it is crucial to understand the nuances that come with various roofing scenarios:

  • Natural rock roofs, created by mining overhead mountain tiles, are unremovable and provide a unique challenge as they cannot be constructed or deconstructed.
  • Constructed roofs, which players can build over any area once it is enclosed with walls, need to be managed carefully to avoid collapses during expansion or restructuring.
  • Thin rock roofs, initially present on the map, can be safely removed without the risk of collapse, allowing for easier manipulation of covered areas.
  • No Roof areas designate zones where players can explicitly prevent roofing, useful when managing outdoor farms or intentionally exposing areas to weather.

By recognizing how different roof types function, players can effectively design their bases to ensure both the safety and efficiency of their colonists.

Strength Variance Between Material Types

Different roofing materials in RimWorld offer varying degrees of structural integrity. Stone walls, for example, are the sturdiest option and ensure the greatest span of supported roof. Wooden walls provide a quicker construction solution but at the risk of lower strength and reduced support distance. Steel walls strike a balance between wood and stone in terms of strength and building time.

For players aiming to maximize their roofing support:

  • Wood should be used cautiously, as it supports smaller roof areas and is susceptible to fire damage.
  • Stone walls, including limestone, slate, and granite, create the most reliable supports for expansive roofing.
  • Bear in mind that the type of material chosen will impact the construction time, resource availability, and overall structural stability.

Careful material selection tailored to the roof’s purpose and location within your base is essential for maintaining the safety and integrity of your structures.

Management of Roof Areas

Effectively managing roof areas in RimWorld is crucial to base safety and expansion. To do so, ensure that every constructed roof is intentional and strategically placed by following these key points:

  • Regularly inspect roofs using the ‘Remove Roof’ area tool to prevent accidental collapses during expansion projects.
  • When deconstructing, use the ‘Remove Roof’ zone before tearing down walls to avoid unintentional damage from sudden collapses.
  • Keep an eye on the automatic roof area that is generated with new structures. Adjust it as needed to maintain a safe roofing structure.
  • After mining or altering terrain, reassess roof areas to confirm their stability without relying solely on auto-generated zones.
  • Create no-roof zones over outdoor areas intended for growing plants or open-air stockpiles, which can help in managing spaces efficiently and safely.

By actively monitoring and adjusting roof zones throughout the building process, you can ensure the integrity of your structures and protect your colonists from unexpected accidents.

Deconstructing Roofs Safely

When deconstructing roofs, prioritizing safety prevents disastrous collapses. Start by removing any roof sections that are furthest from supports, such as walls or pillars, gradually working inwards towards these anchors. This technique spreads the load as you decrease the roofed area, reducing the risk of abrupt and large-scale collapses.

Always keep a close eye on the roof stability indicator in the game. It will highlight dangerous areas in red, signaling where you should not proceed without additional support. For any large roofed area, consider temporary supports during the deconstruction process to prevent accidental collapses that can harm colonists and damage infrastructure.

It’s crucial to have a constructed building plan before starting to remove any roofs. Plan and execute in phases: deconstruct a zone, build necessary support for the next section, and then proceed. By avoiding deconstruction of roofs that are more than six tiles away from a wall or support, you minimize the potential for collapse.

Remember that colonists will deconstruct roofs in their immediate area first. Managing colonists’ positions manually ensures they don’t inadvertently strand themselves under an unstable roof.

Lastly, always be aware of the weather. Removing a roof during a rainy or snowy season can affect indoor stockpiles or damage electrical components, leading to further complications beyond structural concerns.

Expanding Base Without Triggering Collapses

When you’re ready to grow your base, it’s crucial to plan expansions with roofing safety in mind. Keep these critical pointers in hand to ensure a smooth and safe extension:

Use Planning Tool: Before you break ground, lay out future walls using the planning tool. This foresight allows you to design a structure that won’t exceed safe roof spans. – Build in Phases: Erect the structural walls first to provide immediate support for new roofs. Only then should you remove any existing walls that might compromise roof integrity. – Progressive Roofing: After the walls are raised, zone for roofs in manageable sections. This step-by-step method allows you to monitor stability as you go. – Monitor Roof Status: Keep an eye on the roof status in the zone/room stats to detect any areas at risk of collapse due to inadequate support. – Temporary Supports: In large structures, you may need to build temporary interior walls or columns that can be removed once the permanent walls are in place. – Revisit Supports: As your base expands, periodically check existing supports. The integrity of what was once a perimeter wall may change as it becomes an interior wall.

By following these strategies, you’ll maintain a sturdy roof over your colonists’ heads even as your settlement scales.

The Danger of Digging Into Overhead Mountains

When excavating into overhead mountains, players face unique challenges due to the increased risk of roof collapses and infestations. Mountains can collapse if large areas are mined out without proper support, and the darkness of overhead mountain tiles is an ideal breeding ground for insectoid infestations.

To ensure safety and stability:

  • Leave pillars of the original rock at regular intervals as natural supports.
  • Gradually mine in small sections, especially when creating large rooms, to avoid removing too much support at once.
  • Install columns in extensive underground bases to prevent unexpected collapses.

Be cautious of the infestation risk:

  • Infestations typically occur in areas under overhead mountain tiles that are dark and have a temperature between -17°C and 40°C.
  • Minimize infestation chances by lighting all underground areas and controlling temperatures through heating or cooling.

Monitor the roof:

  • Check the roof type by hovering over the “Expand No Roof Area” tool; natural rock roofs won’t collapse but constructed roofs will.
  • Observe mood debuffs in your colonists, as cave-ins and infestations can severely affect their morale.

By carefully managing overhead mountain excavation, you can utilize these areas safely and maintain the structural integrity of your base.

Managing Infestation Risks

To curb the risk of infestations when building under overhead mountains, consider the following points:

  • Temperature Control: Insects are less likely to spawn in cold areas. Maintain a sub-zero temperature in mountainous regions of your base to deter hives.
  • Light the Way: Infestations tend to occur in dark areas. Keeping your mine networks and rooms well-lit reduces the chances of an infestation.
  • Frequent Monitoring: Periodically check for infestation markers, such as jelly deposits or unusual insect activity, to pre-empt possible outbreaks.
  • Zone Designation: Designate low-traffic or non-essential areas for digging into mountains, minimizing the impact in case of an infestation.
  • Strategic Layout: Leave open spaces and create choke points in your base design. In the event of an infestation, these will allow for more effective defensive maneuvers.
  • Emergency Response Plan: Have a plan that includes drafted colonists and animals that can quickly respond to any infestations, ensuring swift and decisive action.
  • Regular Drills: Conducting mock drills can prepare your colonists for the actual event, reducing panic and improving coordination during an infestation combat.

Implementing these strategies will not completely eliminate the threat but will significantly reduce the probability and potential damage of an infestation.


How do you roof an area in Rimworld?

In Rimworld, roofing an area is accomplished by designating a ‘Build roof area’ and ensuring there are enough constructed walls around it, and a pawn assigned to construction will automatically build the roof accordingly.

How do columns work in Rimworld?

In Rimworld, columns function as supports, carrying the weight of roofs up to six tiles away in every direction, and demolishing these supports will result in a sudden collapse of the roof, which could harm or even kill anything beneath it.

What are the repercussions of a roof collapse in Rimworld?

In Rimworld, a roof collapse can cause severe injuries to colonists, damage to surrounding structures, and loss of stored items.

How can one prevent roof collapse in Rimworld?

In Rimworld, roof collapse can be prevented by ensuring support structures, such as walls or pillars, are placed not more than six blocks apart from each other.

What materials can be used for roofing in Rimworld?

In Rimworld, roofing materials include wood, steel, silver, gold, uranium, jade, and plasteel.