Steve Jackson Games - Site Navigation
Home General Info Follow Us Search Illuminator Store Forums What's New Other Games Ogre GURPS Munchkin Our Games: Home

Go Back   Steve Jackson Games Forums > Roleplaying > GURPS

Reply
 
Thread Tools Display Modes
Old 09-25-2017, 09:16 PM   #1
David Johnston2
 
Join Date: Dec 2007
Default Walls

How many dice of damage would it take to shoot through an exterior house wall into someone's head with a decent chance of killing them? What about an apartment wall?
David Johnston2 is online now   Reply With Quote
Old 09-25-2017, 09:48 PM   #2
Rupert
 
Rupert's Avatar
 
Join Date: Aug 2004
Location: Wellington, NZ
Default Re: Walls

It depends on the wall. An interior drystone wall probably has DR1. A brick or concrete exterior wall could have DR30+, while a timber exterior wall probably has DR2, at best.

It also depends where on the head you hit. A person's skull has DR2, and any penetrating damage is multiplied by x4. A hit to the eye with a bullet means no DR and the same damage multiplier. A hit to the face means no DR, but the damage multiplier is that of the attack (pi, pi+, etc.).

Thus at the low end we have an attack through an interior wall into the eye - DR1, needing 20 points of damage to force a death check (and thus 4 points of penetrating damage). This requires 1d+2 damage, and a .22 long rifle bullet fired from a rifle is sufficient.

At the high end we have a shot through a DR32 (4" thick) brick wall to the face, requiring ~52 points of damage if it's a pi attack, and thus 15d pi. As that's beyond a normal full-bore rifle (pi), let's look at pi+: 32 + 20 / 1.5 = 46 points -> 13d. Not much lower, so we'll check pi++: 32 + 20 / 2 = 42 -> 12d. Realistically you need an anti-tank rifle if you're shooting through that wall, or armour-piercing ammo and a skull/brain hit (7d(2) pi- for a 7.62x51mm APHC round gives ~30 points of damage if you hit the skull through that wall).

In conclusion - brick and concrete exterior walls are quite good cover. Interior walls are not.
__________________
Rupert Boleyn

"A pessimist is an optimist with a sense of history."
Rupert is offline   Reply With Quote
Old 09-25-2017, 09:49 PM   #3
evileeyore
 
evileeyore's Avatar
 
Join Date: Jul 2006
Location: 100 hurricane swamp
Default Re: Walls

What's the exterior wall made of*? And the interior walls?


Personally I'd call each 1/2 of sheetrock (wallboard) 1 DR and 2 HP, most interior wall are 2 layers (1 inch) of sheetrock (two separate layers, one of each side). Better built homes (more noise proofed) will be 4 layers, however this is 2 separate layers of 2 on each side of the wall, so 2 DR 4 HP and then another 2 DR 4 HP.

The walls between different units in an apartment building should also be 4 layers often times with a mesh screen between (chicken wire) which should add a separate 2/0 DR 4/0 HP (the second number is versus pi).

Each layer of sheetrock is 30 minutes fire rated**, so versus fire it has a lot more DR.



* Basic Set recommends 6 DR exterior walls for modern buildings, which if made of empty cinder block almost*** sounds right. If it's properly filled with concrete however (which it should be! And reinforced to boot!) that's 6 inches of concrete... which I would treat as brick for blow through purposes only, so DR 16 HP 16.

** Which with only 1 layer drops to mere minutes at seams. This is also why better built homes use multiple layers on each side of a wall, they overlap the seams better to give a greater heat and fire insulation.

*** I was popping cinder blocks with a .38 as a kid, so... maybe 6 DR is a leetle high for a 'void' cinder block construction house. And it feels weak for a solid 6-7 inches of reinforced concrete and block , which is what I'd call a 'modern middle class home'.
__________________
Feel free to steal, borrow, fold, spindle, mutilate any rule, advantage, etc I come up with it.
evileeyore is offline   Reply With Quote
Old 09-25-2017, 09:50 PM   #4
(E)
 
Join Date: Jul 2014
Location: New Zealand.
Default Re: Walls

A timber weather board house might have a DR of 3 (one inch of good timber, insulation and then gib board) and a one in ten chance of hitting something harder on the way through. Most of the time the harder material might add a D6 to the DR but there is a slim chance a piece of heavy steel might be in the way.
__________________
Waiting for inspiration to strike......

Last edited by (E); 09-25-2017 at 09:54 PM.
(E) is online now   Reply With Quote
Old 09-25-2017, 10:00 PM   #5
evileeyore
 
evileeyore's Avatar
 
Join Date: Jul 2006
Location: 100 hurricane swamp
Default Re: Walls

Note, that sheetrock (wallboard, drystone, etc), though stone, should not be treated as Homogeneous or Amorphous.
__________________
Feel free to steal, borrow, fold, spindle, mutilate any rule, advantage, etc I come up with it.
evileeyore is offline   Reply With Quote
Old 09-25-2017, 10:04 PM   #6
Rupert
 
Rupert's Avatar
 
Join Date: Aug 2004
Location: Wellington, NZ
Default Re: Walls

But it is homogenous. It just has cruddy HP for its weight (and probably HT).
__________________
Rupert Boleyn

"A pessimist is an optimist with a sense of history."
Rupert is offline   Reply With Quote
Old 09-25-2017, 10:11 PM   #7
Buzzardo
 
Buzzardo's Avatar
 
Join Date: Mar 2008
Location: Austin, TX
Default Re: Walls

When I lived in Houston, the gangs had a thing for shooting into each other's houses at knee height, figuring they'd get the kids (as happened once in a while). They'd use AK-47s. So an AK-47 does enough damage to kill through the wall of a house. I don't suppose those walls had more than about DR 10.
__________________
Play Ogre? Want an interactive record sheet?

Want a random dungeon? How about some tables for that? How about a random encounter?

Google Plus Profile
Buzzardo is offline   Reply With Quote
Old 09-26-2017, 04:40 PM   #8
(E)
 
Join Date: Jul 2014
Location: New Zealand.
Default Re: Walls

The series mythbusters had an episode devoted to shooting through walls, a 9mm fired from a pistol went through only fractionally slowed.

https://en.m.wikipedia.org/wiki/Myth...s_(2015_season) episode; supernatural shooters.
__________________
Waiting for inspiration to strike......
(E) is online now   Reply With Quote
Old 09-26-2017, 05:29 PM   #9
Purple Haze
 
Join Date: Jul 2006
Default Re: Walls

Standard modern house exterior wall here would be brick veneer. That would be a brick, 0.5" chipboard/beaverboard, 9" fiberglass batting, 0.5" drywall.

Standard old house exterior wall would be "double brick". Two bricks (three for the ground floor), ~3" of crappy insulation, 0.5" wood lath, ~0.5" of horse hair and plaster.

Used to be different, but every apartment/condo built since the early 70's, units are separated by at least 4" of reinforced concrete.
Purple Haze is offline   Reply With Quote
Old 09-26-2017, 05:42 PM   #10
evileeyore
 
evileeyore's Avatar
 
Join Date: Jul 2006
Location: 100 hurricane swamp
Default Re: Walls

Quote:
Originally Posted by Purple Haze View Post
Used to be different, but every apartment/condo built since the early 70's, units are separated by at least 4" of reinforced concrete.
I'll accept that. My first hand knowledge of apartments comes being a repair man (in the 90's) to several communities built back in the 40-50's.
__________________
Feel free to steal, borrow, fold, spindle, mutilate any rule, advantage, etc I come up with it.
evileeyore is offline   Reply With Quote
Reply

Tags
architecture, material strength

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Fnords are Off
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 11:28 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.