I had a bat problem for which I did an exclusion. They have not been back since. I cleaned the attic and sprayed a bleach mixture at the time. All seemed ok but at certain times I still get a smell. I was hopeful that it would just stop by it’s self but that doesn’t seem to be the case. It only seems to happen when the weather is humid. Any thing I can do to get this smell out once and for all? Thanks.
Absolutely. If you review the products listed in our BAT CONTROL article, you’ll see we have several designed for cleaning up bat droppings and the odors associated with their presence. As you’ve already learned, bleach will not get rid of the smell. In fact bleach will take away the color of many things but it’s not designed to kill anything and since odors are very much “alive”, you’ll need to use special agents to render them useless and non offensive. Odors will live for many years and in most cases, just go dormant when it gets dry and/or cool. But once the local air temperature reaches a certain level along with the right humidity, you’ll no doubt notice the smell come back.
Now the best product for killing the smell is NNZ. This material can be applied to the attic by either spraying or misting. Use a standard PUMP SPRAYER if you feel the risk of run off and overspray is low because you don’t want the treatment leaking onto your ceiling below and causing stains.
Remember to treat the insulation thoroughly and if this can’t be done properly by spraying, get a BG2300 MISTER. This will allow you to get the entire attic treated without having to navigate around the attic space much since the mist will permeate well and carry the NNZ to key areas.
As a last resort, you may have to remove all the old insulation, treat the exposed wood and then re-insulate. I’ve seen where bat droppings can accumulate so much that the old insulation is not “savable” and since you didn’t mention just how bad the bat problem was you had, I cannot say for certain if this will be required or not.