Break DCs for large, huge, gargantuan and colossal objects - Suggestions?

[Archasimos]

Does anyone have any ideas for break DCs for large, huge, gargantuan and colossal objects? Hit points weren't too hard to figure out, but there isn't any way that I can find to scale up the break DC of items based on size.

I'm think in terms of characters knocking over objects such as pillars and statues.

Is there any precedent for this? You'd think this would be something that could definitely be done in some Pathfinder games by strong characters, and definitely in mythic games.

One reason I'm interested is that there is an upcoming scenario in the game I'm running where the characters can try to knock over these colossal obsidian statues onto the big bad for a substantial amount of damage, and a chance to pin it.

I don't expect any single character to do it alone, but there are several player characters and a number of large sized NPCs with high strength that can help. To make it slightly easier the characters can also try to damage the statues down to half HP to reduce the break DC by 2 (not much I know). I'm also going to allow a knowledge engineering check to determine if a statue may already be cracked enough at its base to make it easier to knock over.

So, any suggestions or precedents for scaling up the break DCs of larger objects?

Thanks.