Double building health on anti air traps is the same as only having 1 building health buff. I'll share the image of a ceiling piece with a ceiling trap with only 1
Fortnite Trap Damage: How Significant Is the Trap Buff? - GameRevolution
Fortnite v8.20 Patch Notes Revealed: Floor is Lava LTM, Poison Dart Trap and Creature Spawner - TheNerdMag