How best to set off flea & roach foggers? A room now, a few days later other rooms? Is this effective?

If you set some flea foggers off in one room , then a few days later set a few more off and so on until all house has been fogged, can this work or will it just get rid of a few? This can't be good. So, anyone " know "??

Answers:
You should bomb the whole entire house at the same time.

Other answers:
when we did our house we did one room a day at a time. They packet about the foggers said that the medicine in the fogger would still be on the floor and in the furniture so they wont go back to that room when you set it off in another. Hope thats what you were talking about. It got rid of our problem!
when we did our house we did one room a day at a time. They packet about the foggers said that the medicine in the fogger would still be on the floor and in the furniture so they wont go back to that room when you set it off in another. Hope thats what you were talking about. It got rid of our problem!
When I was a kid, we had serious roach problems in one of the places we lived in. The only way my folks were successful was by bombing everything at once. Befor that, the roaches just relocated to the outdoors and/or other areas of the home until things dissipated, and then moved right back in.... it may not have been immediate, but within months, the infestation problem came back. My father FINALLy went out, bought exterior and interior caulking, did as much sealing as he possibly could and then bombed the place. We stayed at my grandparents for four days. Never saw another roach after that.
set them all at once, place one in each avg sized room, hall, bath, and underneath of the home as well--if you cant crawl under it, try tossing them thru crawlspace opening and vents. if it calls for 6 use 9
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