Survival Log Door Durability and Window Values
Quick answer
A stock Survival Log front door has 100 durability, a Security Door around 150-155, and a Security Window 130. Titanium Alloy doors and Bulletproof windows sit above those as the top purchasable tiers. Because door and window home slots are counted separately and are extremely limited, the practical question is rarely "which is best" but "which two can I actually install".
"What is the maximum defense of the alloy door and bulletproof window?" is an unanswered question on the Survival Log Steam forum, and every wiki currently online describes fortification without printing a single number. The values below are read off the game's own interface in published screenshots. Where a value is not visible anywhere, this page says so instead of guessing.
Verified Survival Log door durability values
| Barrier | Max durability | Confidence | Evidence |
|---|---|---|---|
| Front Door (stock) | 100 | Verified | Day 7 siege HUD: 80/100 |
| Security Window | 130 | Verified | Day 16 in-world label: 100/130 |
| Security Door | 150-155 | Verified | Day 16: in-world 120/155, HUD bar 120/150 |
| Titanium Alloy Door | Not published | Tier confirmed | Sold at renovation store; community-reported |
| Bulletproof Window | Not published | Tier confirmed | Top window tier; community-reported |
The 150 versus 155 Survival Log discrepancy is worth explaining rather than smoothing over. In the same Day 16 frame, the alert bar at the top of the screen reads Security Door 120/150 while a door in the scene is labelled 120/155. The most likely reading is that these are two different doors of the same type on different floors, with a small variance from installation or repair state. Treat 150-155 as the Security Door band.
What those numbers mean in practice
Raw Survival Log door durability is only useful measured against the rate sieges remove it. Two reference points from official footage make the curve visible:
- Day 7: a stock Survival Log front door sits at 80/100 during the first Zombie Siege. Twenty percent gone in week one, before any upgrades.
- Day 16: a Security Door is at 120/155 and a Security Window at 100/130 during "Undead Swarm! Part II" - both roughly 77% intact while a multi-part event is running.
The pattern that emerges is that upgrading Survival Log door durability roughly keeps pace with escalation rather than outrunning it. A Security Door on Day 16 is in about the same relative condition as a stock door on Day 7. That is the central Survival Log defense insight: upgrades buy you parity with the schedule, and traps are what buy you an advantage.
Survival Log door and window upgrade order
- Buy the door tier during prep. Doors are the highest-value fortification purchase in the ten-hour phase, because the first siege lands in week one.
- Windows next, but check your Survival Log slot counts. A window counter at 2/3 means limited room. Windows are often the weaker point once doors are upgraded.
- Craft supplementary supports. Survival Log defense crafting includes Security Door and Security Window support items, which is how you reinforce without a fresh purchase.
- Reinforce during sieges only when necessary. Reinforce Door is an available action mid-event with a progress bar, but it costs the day's capacity.
- Shift to traps. Once repair cycles dominate your Planning Points, more durability stops being the efficient answer.
The Survival Log slot limit nobody warns you about
Screenshots of the Survival Log prep-phase Home Slots panel show door and window capacity tracked separately from every other furniture category, with counters reading DOOR 2/1 and WINDOW 2/3. Owned quantity can exceed installable slots.
In practice this means a Survival Log run cannot simply buy its way to safety. You are choosing which one or two entrances get the good tier, and the rest get crafted supports and traps. Plan that allocation before you spend, not after - the layout guide covers how floors change which entrances actually matter.
Help complete this Survival Log durability table
If you have a Survival Log screenshot showing a Titanium Alloy Door or Bulletproof Window with its durability visible during a siege, that number would complete this page. Until it is verified, this wiki leaves it blank rather than publishing a figure that looks authoritative and is not. Contact details are on the contact page.
Survival Log FAQ: Doors & Windows
What is the maximum defense of a Titanium Alloy Door in Survival Log?
The exact ceiling is not shown in any published screenshot, so this wiki will not invent a number. What is verified: a stock front door caps at 100, a Security Door reaches roughly 150-155, and a Security Window caps at 130. Titanium Alloy sits above Security as the top purchasable door tier, sold at the renovation store.
How much durability does a Security Door have?
Around 150-155. Official Day 16 footage shows a Security Door reading 120/155 mid-siege, with a companion HUD bar showing 120/150 - the small variance likely reflects two separate doors rather than one changing value.
How much durability does a Security Window have?
130. A Day 16 screenshot shows one at 100/130 while an Undead Swarm event is active.
How many doors and windows can you install?
Very few. Home slots are typed and counted separately, and screenshots show a door counter at 2/1 and a window counter at 2/3 - meaning you can own more than you have room to install.
Should I repair or upgrade?
Upgrade while you can afford the daily actions. Repairing consumes Planning Points every siege; a higher tier reduces how often you need to spend them at all.