So the demolitions rules allow for additional damage in one of two ways:

You can add +2 damage for each degree of sucess you get.

You can add +2 damage for each minute you spend preparing the charge. The thing about that is there is no limit that it places.

So if I, or the NPC, spends an hour do I really get +120 damage to it? It just seems that it is a bit overpowered to just say time with no ultimate cap on it would be to powerful. I was thinking of putting a max cap on the damage you could put on it of the Intelligence Bonus of the character placing the charge. So a character with a 50 intelligence could put in a max of +10 to the charge.

Depends on what the charge will be used for. I interpreted it as the extra time would be spent placing the explosives more effectively, and consequently for more damage. For something like a booby trap, obviously there is only so much you can do as regards proper placement so capping it makes sense (Personally I would cap the damage bonus to be the same as if they acheived their personal maximum degrees of success), whereas if you are fixing to demolish a structure, it's much more flexible and wouldn't put any hard caps on it, so long as it's reasonable (Taking down an entire hive spire with 1kg of explosives is rediculous, for example)

I agree with Tex. What you have to work with would be the biggest factor. 1kg of explosives maynot bring a Hive down, but if you tied it to the main reactor then iit'll do the trick. You'd also have to see if the PC has the nessary associated skills to do what they want to do. If he has no engineering/artcitectual knowlege he'd be limited on the amount of damage he could do to a building.

Ichiban11 said:

Ah, I was operating on the assumption that the demolitions skill imparted just such knowledge. Placing explosives and rigging them to detonate is really a relatively simple task, knowing how to place them where they will have the most effect is much trickier.

Now depending on the what the structure is, what the PC wants to do and how it effects the game no check or follow on skill checks may be needed. If he just wants to blow a hole in the wall and not care where the debris goes one check should do it, but if the debris falls back on him or the other PC's so be it.