The BlockPenetration package can be used to add block and material hardness values to Immersive Intelligence's block damage system.

ZenScript
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import mods.immersiveintelligence.BlockPenetration;

Type	Name	Required
Type IMaterial	Name Material	Required Yes
Type int	Name Integrity	Required Yes
Type int	Name Density	Required Yes
Type String	Name Penetration Type	Required Yes
Type String	Name Sound	Required Yes

Integrity is the amount of hitpoints a block has. Damage is dealt in a similar way it is done to entities.
Density is the modifier of speed loss after contact with the block. The higher the density, the more a bullet will be slowed down after penetration.

ZenScript
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mods.immersiveintelligence.BlockPenetration.addMaterial(IMaterial material, float integrity, float density, String penetrationType, String sound);

Name	Used for
Name metal	Used for all the metals
Name ground	Used for dirt, sand, etc.
Name solid	Used for stone, bricks
Name flesh	Used for unarmored mobs
Name light	Used for glass, wool, leaves, cloth

ZenScript
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mods.immersiveintelligence.BlockPenetration.addMaterial(crafttweaker.blocks.IMaterial.cake(), 1, 1, "light", "immersiveintelligence:siren");

This function is an easy way to add a metal block and sheetmetal along with their slab variants using an Ore Dictionary name.

Type	Name	Required
Type String	Name Sound	Required Yes
Type int	Name Integrity	Required Yes
Type int	Name Density	Required Yes

ZenScript
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mods.immersiveintelligence.BlockPenetration.addMaterial(String name, float integrity, float density);

ZenScript
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mods.immersiveintelligence.BlockPenetration.addMaterial("unobtainium", 1, 1);

Type	Name	Required
Type IBlockState	Name BlockState	Required Yes
Type int	Name Integrity	Required Yes
Type int	Name Density	Required Yes
Type String	Name Penetration Type	Required Yes
Type String	Name Sound	Required Yes

ZenScript
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mods.immersiveintelligence.BlockPenetration.addMaterial(IBlockState state, float integrity, float density, String penetrationType, String sound);

ZenScript
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mods.immersiveintelligence.BlockPenetration.addMaterial(<blockstate:minecraft:log:variant=spruce>, 1, 1, "light", "immersiveintelligence:siren");