KM Ant Pro stations must be placed wherever the ants would normally feed. They act as a replacement food source which is readily available. Ants do not feed at the roof level. They will feed at the ground level. If you place the KM Ant Pro Stations at the ground level near shrubs, under a deck or in other cool shady places, the ants can find them and will probably feed. If you place the KM Ant Pro stations on the roof, the sun will bake the plastic and heat the bait which will render it useless. Placing in an attic is also not advisable. Place them outdoors and you will get results.