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when you have a unit in a building that explodes is it just str 3 hits to everyone in the building and then a crater that is not dangerous terrain? it seems more dangerous for the wrecked result to come up on a building. that way its at least dangerous terrain. I'm sorry for the poorly worded questions. From my understanding if you get a penetrating hit on a building you then roll a 5 the building becomes dangerous and the unit would have to test for dangerous terrain. rolling a 1 is instant kill. then if the unit tried to move out of the dangerous terrain they would test again. with a 6 rolled on the penetrating hit agents buildings the building explodes and there is a crater remaining where your units are nice and safe inside of the crater. str 3 hits with no ap aren't very dangerous. am i wrong or is wrecked a more dangerous result?

If you roll a 5 the building is wrecked and the occupants have to disembark the building the same way they would have to disembark a vehicle that was wrecked. So the occupants would end up outside the ruin.

@kmdl1066: I'm not so sure about that. Buildings are treated like normal vehicles, not transport vehicles. I don't see anything about units on or in a building having to "disembark". But I may have missed something. Would'nt be the first or last time
@OP: They way I see it, if a unit is inside or on top of a building that is wrecked, they are placed in difficult & dangerous terrain. But they don't have to test unless they move. Some might point out that they "entered" the dangerous terrain when the building is destroyed, and I can see their point, but it's just not the way I see it.
If the building explodes, it explodes just like a vehicle, forcing models within d6 to suffer a str 3 AP - hit. I would rule that the models in or on the building are within the d6, even if a 1 is rolled, and so would take the hit. Then they are placed within difficult, but not dangerous terrain.
So it's kinda pick your poison: Test now (explosion) or take a chance and test later (Wrecked, move through dangerous terrain).

An occupied building works just like a transport.

Treat the building as an immobilized transport with no weapons, so a pen hit will force them out on a 3-5, and on a 6 they all take a S4 hit

You follow all the rules for vehicles and embarked troops

So on a wrecked! result - no immediate damage, they disembark through any access points / emergency disembark, and the building is now difficult and dangerous terrain

On an explodes - they all take a S4 hit, units within D6" take a S3 hit, and they are placed in a diff terrain crater.

IG - you are entirely incorrect there. The rules for buidlings EXPLICITLY state they ignore all results but wrecked and explodes. You CANNOT wreck it through getting an immobilised or weapon destroyed result.

IG-Sqroot wrote:Treat the building as an immobilized transport with no weapons, so a pen hit will force them out on a 3-5, and on a 6 they all take a S4 hit

IG - you are entirely incorrect there. The rules for buidlings EXPLICITLY state they ignore all results but wrecked and explodes. You CANNOT wreck it through getting an immobilised or weapon destroyed result.

Both wrong, weapon destroyed, immobilized and stunned are treated as "Crew Shaken" (BRB pg. 79).

I stand corrected :-)