Weapon Elemental Damage Stack?

[Darwishy]

Hiya, i was just wondering if my rifle will do more damage if i have multiple elemental damage in my weapon. I currently only have freeze damage. Will my damage increase if i add fire/lightning aswell or does it only pick one elemental ?

[Cryp2Nite]

Every element adds additional elemental damage based on your base-damage.

 

http://warframe.wikia.com/wiki/Damage

[Archistopheles]

Short answer is: Yes.

[Dovahjim]

It will increase, it adds additional damage for example a 100 damage weapon with 50% fire damage and 30% ice damage will do 100 normal damage, 50 fire damage and 30 ice damage so on a mob with no weaknesses, armour or resistances it will do 180 per shot.