Project Zomboid Processing Guide: B42 Material Quantities, Tools and Building Requirements | gemelog

Edition: PC Steam base game (app 108600), a new solo game without mods. Based on Stable 42.21 and standard Apocalypse rules. Rising is identified separately as a beginner practice example; differences in town, traits, Sandbox and MP settings are kept distinct.

Verification scope: The official “Stable Build: 42.21” label and the September 28 stable-release announcement were checked on 2026-10-04. This is separate from Build 41 (legacy41) and the earlier Build 42 Unstable branch. Basic processing quantities were compared with public B42 game data and 42.20.4 material, and the 42.21 change announcement was checked. Not every recipe has been verified in a running 42.21 game.

Sources checked: 2026-10-04

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Use B crafting and the building interface on the left separately

In Build 42, distinguish crafting an inventory item from placing furniture or structures through the building interface. If a name is absent from the B41 right-click path, that does not necessarily mean its materials are unavailable.

Decide whether the intended result is an inventory item or a facility placed on the ground. Open crafting with B or the building list through the icon on the left.
If a name search fails, search by ingredient or output. Distinguish Japanese and English names, bag and tarp variants, and lower- and higher-tier names.
Select the recipe and read its materials, tools, skills, knowledge and work-facility requirements. Resolve red/missing conditions one at a time.
If ingredient alternatives are selectable, specify which items to use. Check that cloth, bags or tools you want to keep are not selected for consumption.
Stand somewhere safe to craft and gather the required items in personal inventory or an accessible nearby container. Perform the recipe once first.
Check the output quantity, consumed materials and tool condition. For building, also confirm access to the placement location and usability after placement.

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Use B crafting and the building interface on the left separately: 5 entries
Interface/action	Main targets	What you can check	Common confusion
Crafting	Sawing logs, bags and similar items	Ingredients, tools and output	Pressing B does not necessarily show every piece of furniture.
Building	Crates, rain collectors, campfires and similar facilities	Skills, materials and placement	Similar-looking facilities can use separate recipes.
Right-click	Actions specific to the target	Window reinforcement, facility use and similar actions	Do not combine requirements from separate action paths.
Skills panel	Current skill and XP multiplier	Check the relevant skill with L.	Do not assume reading a book alone meets the required level.
Recipe knowledge	Whether it has been learned	Skill, occupation/trait, magazine and other requirements	Do not equate skill books with recipe magazines.

This material table uses the overlap between public B42 game data and guide material. The sources identify minor versions from 42.13 through 42.20.4, or only B42. It is not a complete runtime check in the adopted Stable 42.21; prioritize the item’s displayed requirements if they differ.

Cloth is shared between screening, carrying and first aid

Before ripping every sheet you find, check window screening and bag needs. You cannot use the same sheet for several purposes simultaneously; this example starts with the purpose currently lacking.

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Cloth is shared between screening, carrying and first aid: 4 entries
Item made/used	Skill/knowledge/facility prerequisites	Tools and material quantities	Action	Use/version differences
Sheet Sling Bag	No skill, knowledge or workbench required	1 sheet → 1 bag	Use Make Sheet Sling Bag, equip it on your back and put items inside.	Possession and equipment are separate. A B42 item.
Sheet Rope	Crafting and installation at a window are separate actions	1 sheet → 1 rope	After crafting, check the required length and fastener at the upstairs target.	Crafting 1 rope does not let you descend from any height.
Window screening	A window that accepts a sheet	Example using 1 sheet per window	Right-click the window to hang it and confirm it is closed.	Screens sight; does not add barricade durability.
Cloth for improvised bandages	Rippable clothing/fabric; action requirements differ by material	Use the selected clothing/fabric; check the yield on screen.	Apply the clean cloth produced by ripping to a body part in Health.	Different sheets and clothing yield different quantities; do not use one universal number.

Before dismantling a bag back into materials, check its contents and equipment state. Ripping fabric, applying a bandage and healing a wound are separate stages.

Follow the process from logs to planks

Crate and rain-collector requirements call for planks. A log may not substitute directly. Even apparently light work can increase load and muscle strain if sawing and carrying continue for too long, so stop at the amount needed.

Read the facility’s required plank quantity first.
Prepare a log and a compatible saw, then perform Saw Log once.
Check that you gained 3 planks, retained the tool and are not carrying too much.
Move the materials near the intended location and recheck quantities in the building interface.

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Follow the process from logs to planks: 3 entries
Output	Skill/knowledge/facility prerequisites	Tools and material quantities	Action	Use/version differences
3 planks	No skill, recipe knowledge or workbench requirement	1 log + 1 compatible saw (retained)	Select Saw Log in crafting.	Use for crates or rain collectors. Do not assume a flint saw always substitutes.
1 plank	No skill, recipe knowledge or workbench requirement	1 large branch + 1 compatible saw (retained)	Select Saw Large Branch.	Do not confuse it with differently sized branches such as Tree Branch.
Finding planks locally	The location containing the materials is reachable	Check construction/tool-related containers.	Bring back only what is needed or process nearby.	No fixed spawn quantity or guaranteed shop is promised.

Do not judge a tool solely by its appearance or the name “saw”; check whether it is an accepted recipe option. Tools may deteriorate even when not consumed whole like an ingredient.

Materials for facilities used in an early base

Read quantities against the specified recipe’s requirements. Do not invent conversions between nail boxes, bundles and display units; check that the screen shows the requirement met. This table is limited to the basic crate, small/large rain collectors and campfire.

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Materials for facilities used in an early base: 6 entries
Output	Skill/knowledge/facility prerequisites	Tools and material quantities	Action	Use/version differences
Basic wood crate (Wood Crate / Shoddy)	Carpentry/Woodworking 3. Furniture in building. No additional magazine/workbench.	1 hammer (retained) + 4 planks + 4 nails	Select the basic wood crate in building and place it clear of passageways.	Open it after placement and transfer materials. Separate from higher-tier crates.
Small rain collector, garbage-bag variant	Carpentry/Woodworking 3. Outdoors in building. No additional magazine/workbench.	1 hammer + 4 planks + 4 nails + 4 garbage bags	Select the bag-based Rain Collector Crate and place it outdoors.	Check rain access and water quality. Do not use B41 skill values.
Small rain collector, tarp variant	Carpentry/Woodworking 3. Outdoors in building. No additional magazine/workbench.	1 hammer + 4 planks + 4 nails + 1 tarp	Select the separate recipe with Tarp in its name, not the bag variant.	It does not require both 4 bags and 1 tarp.
Large rain collector, garbage-bag variant	Carpentry/Woodworking 5. Outdoors in building. No additional magazine/workbench.	1 hammer + 6 planks + 5 nails + 4 garbage bags	Select the bag-based Rain Collector Barrel.	Do not use the small collector’s plank/nail quantities.
Campfire	Outdoors in building. No skill, knowledge or workbench required.	3 stones. Fuel and fire-starting supplies are separate.	Select Campfire and place it outdoors, considering fire spread and movement routes.	Do not use the older plank-and-cloth kit recipe.
Plank barricade on a window/door	Target can be barricaded; a compatible tool is required	A hammer-type tool, planks and nails. Check the current requirement for the nail quantity.	Check the target’s right-click menu or corresponding building entry.	B42 building data and older context-action sources disagree on nails; an exact quantity is withheld.

Rain-collector hammers are also retained tools. Check accepted tools in the recipe and choose a compatible one, such as a claw hammer. This table excludes conversions between old capacity units and liters, barricade HP and durability guarantees.

Placing stones does not light a fire

Prepare campfire construction materials, ongoing fuel and the items needed for initial ignition separately. Cooking or water purification also requires a container for the contents.

Build the campfire with 3 stones. Choose a working location away from flammable objects and your usual walking route.
Right-click it and add usable fuel through Add Fuel. Do not select books or materials you want to keep.
Keep matches/a lighter and usable ignition materials in accessible inventory, then read the Light Fire options.
Once lit, move the cooking target into the campfire container and monitor cooking or water-quality displays.
When finished, remove needed items and manage the fire before leaving. Do not step into the burning area.

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Placing stones does not light a fire: 3 entries
Ignition problem	Inventory/facility check	Action to try	Result to check
No ignition option appears	Whether fuel and usable ignition items are present	Prepare fuel first, then an ignition method.	An available Light Fire option
Cooking does not progress	Whether it is lit and which container holds the food	Move the target into the facility’s container.	The cooking display changes.
You cannot judge whether heated water is ready	Container/equipment compatibility and contamination label	Use a compatible cooking pot or similar container and check quality.	Use for drinking after contamination is gone.

Working near flames risks burns or fire. A placed stone ring does not prove that all fire precautions are complete.

Check crafting failures one cause at a time in this order

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Check crafting failures one cause at a time in this order: 10 entries
Crafting problem	Inventory/tool/location check	Action to try	Settings differences
The name is missing entirely	Crafting versus building, search and category	Switch interfaces and search by ingredient/output too.	B41 and B42 use different interfaces.
Wood is present but requirements are unmet	Log/large branch/small branch/plank type	Process it into the planks required by the specified recipe.	Do not assume modded substitutions apply.
You have a box of nails	Required nails and box/bundle display	Check the option for unpacking the required item, then recheck requirements.	Do not equate paths that unpack automatically with those that do not.
Bags/cloth are present but insufficient	Bag versus tarp recipe and selected inputs	Specify the ingredient option and distinguish separate recipes.	Watch for different items with the same appearance.
The tool is not recognized	Accepted tool options and condition	Bring a compatible tool and improve its condition if needed.	A sledgehammer does not necessarily substitute for every hammer.
A skill is red	Current skill in L and required level	Raise the relevant skill. Check the XP multiplier from the appropriate-tier book.	Growth differs with occupation, traits and XP multipliers.
Insufficient knowledge	Whether the recipe is unlearned and how to learn it	Check the specified magazine or other source and skill requirements.	A skill book alone may not meet the knowledge requirement.
Insufficient facility/light	Required work facility, location and time of day	Move near the recipe’s facility and meet the requirements.	Not every desk is every kind of workbench.
Invalid placement	Furniture, passageways, accessible sides and orientation	Change the destination and orientation so you can work there.	Buildings, terrain and mods can differ.
The action stops after starting	Movement, approaching enemies and material locations	Secure the surroundings and try once again.	In MP, check server-side completion and inventory.

Before discarding all materials or repeatedly changing mods, preserve one unmet-condition display and investigate it. Repair success rates and material refunds belong to different recipes; do not generalize this table’s retained-tool statements.

Calculation example: 1 crate and 1 small rain collector

This example assumes Carpentry/Woodworking 3 and makes one basic wood crate and one small garbage-bag rain collector. Adding requirements before sawing makes unnecessary carrying and shortages easier to spot.

Check Carpentry/Woodworking 3 with L and open the requirements for the basic crate and small bag-based collector in building.
Choose somewhere for the materials, then gather a compatible hammer, saw, logs, nails and garbage bags.
If sawing logs 3 times, confirm the result is 9 planks. Take a break if weight or muscle strain worsens partway through.
Place the crate indoors clear of passageways and the small collector outdoors where rain reaches it.
Check that the crate accepts items, then check the collector’s amount and quality after rain. Crafting it and having drinking water ready are separate outcomes.

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Calculation example: 1 crate and 1 small rain collector: 4 entries
What to prepare	Required-quantity calculation	First check
Planks	Crate 4 + small collector 4 = 8	Subtract planks already owned.
Nails	Displayed recipe quantities: 4 + 4 = 8	Meet the required display rather than counting boxes.
Garbage bags and tools	4 garbage bags, 1 hammer. For sawing, also 1 compatible saw.	Bags are for collection; tools are not consumed, but check their condition.
Making all planks from logs	3 log-sawing actions × 3 planks = 9. Use 8, leaving 1.	Assumes no existing planks and recipes matching the table above.

This is an original arithmetic example based on published recipes, not a record of carrying everything in one trip during play. Carrying capacity, rainfall, days of drinking water and uses for leftovers are not guaranteed.

Frequently asked questions

I cannot find a rain collector after pressing B.

B opens crafting. Open the building icon on the left and look for rain collectors under Outdoors. Also check small/large and garbage-bag/tarp recipes and the required Carpentry level.

I gathered planks and cloth for the Build 41 campfire kit.

The B42 Campfire building material checked for this article is 3 stones. Fuel and ignition supplies are also needed after construction. Check building instead of reusing the old kit’s material list.

I read a skill book but cannot build a crate.

Skill books apply an XP multiplier to the relevant skill. Check the actual Carpentry/Woodworking level with L, whether it meets the basic crate’s requirement of 3, and whether the tools and materials are recognized.

Do I need both 4 garbage bags and 1 tarp?

The small collector’s bag and tarp variants are separate recipes. Along with 4 planks, 4 nails and a compatible hammer, use either 4 garbage bags or 1 tarp according to the selected recipe.

Does a barricade require 1 nail or 2?

A discrepancy remains: B42 building data lists 1, while right-click barricading sources list 2. Both paths have not been checked in a running 42.21 game, so this article does not declare one value correct. Prioritize the requirements for the action you actually select.

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Based on site-wide views, captured July 6, 2026 (previous 28 days plus capture day).