QUESTIONS & ANSWERSAsk BCM a Question
How many bats does a Double Chamber bat house hold?
The rule of thumb on most any bat house capacity is to add up the length of the linear roost crevices, then assume a safe holding capacity is 2 bats per inch.
For the Double Chamber bat house, it is 18'' wide with 2 chambers, so that is 36'' of roost space. Multiplied by 2 bats per inch is 72 bats. If Mexican free tailed bats or Myotis spp. move in, they may double stack the wide crevice bringing the capacity close to 100.
A Single Chamber bat house at 18'' wide will hold ~36 bats.
A Triple Chamber bat house at 18'' wide may hold ~108 bats.
The 4 Chamber Premium bat houses at 18'' wide on paper may hold 144 bats, but the Universial model is a special beast with a clever baffle cluster inside. If a myotis spp. or Mexican free tailed bats take up residence, there may be upwards of 210 bats due to the way those bats "double stack" in a wide crevice and when the additional "attic space" is accounted for.
You can use the "2 bats per inch" rule with other manufacturers bat house and test their marketing claims, as sometimes this figure is exaggerated.
My kit included two pieces of 3/8 plywood - roughed. About 8”x2” What are they intended for?
The two pieces of wood you are referring to are “pup ledges”. Nursing females will leave their young in the roost for short periods to forage for insects. Although nursing pups rarely loose their grip, it does sometimes happen when they awkwardly move around within the bat house during this time or are knocked loose by other bats in the colony. The pieces of wood act as a small ledge on either side of the baffle to give the pups something to grab onto if they lose their grip at the top of the bat house. Please refer to the PDF assembly manual for instructions about attaching the Pup Ledges. We offer another product called a Pup Catcher as an accessory if you observe a chronic pup issue. This is much larger, more robust "basket" intended to go below the entire bat house. Pup Ledges in contrast are small wooden ledges inside the bat house between certain baffles.
I just wanted to confirm double chamber boxes will work for this area because your website says the 3 chambers are better.
Yes the double chambers would work anywhere in the US. The larger chamber is ideal for big brown bats (found almost nationwide) and Florida bonneted bats. The narrower chamber is great for a host of species that prefer smaller 4/4'' crevices, such as little brown bats, northern longear, Indiana bat, Southeastern bats, cave myotis, and Mexican/Brazillian free tail bats, to name a few. Just install in a sunny location as the smaller mass of the 2 chamber makes placement a bit more sensitive.
How high above the ground should I set up my bat house?
The bat house should be situated at least 10’ above the ground.
What color should my bat house be?
Because bats need an adequate amount of warmth during the day, solar exposure is very important when setting up a bat house. However bats can also get too warm, so coordinating bat house color with your geographic location can aid in having a successful bat house. Refer to the temperature zone map located on our Four-Chamber bat house page.
Cedar vs. yellow pine wood for the most durable bat house and lowest maintenance?
The wood thickness has something to do with it, how many screws are used to hold it all together, and how well the bat houses have been finished (how many coats of paint used, etc.). So, material is actually not a big player in this in my opinion. True cedar may be more insect resistant, but either box will probably fall apart from normal weathering long before insect damage comes into play.
BCM pre-scratches all interior surfaces of all kits in multiple directions, so bats have the maximum ability to hold on. We do not use screen that bats can become trapped under.
The longest lasting bat houses will be the plastic shells such as the Four Chamber Premium.
I have had your 2 chamber bat house for a couple of years but no bats !😥. Does bat attractant help? I placed it near water 10ft up in a west sided location near trees but not in the trees. Any advice would be appreciated.
It may take a few seasons for something to happen at a bat house, and unfortunately some areas bats just do not need the additional roost space. Feel free to send a photo and approx location of the bat house to firstname.lastname@example.org for more advice.
I live in Fredericksburg VA. We don’t have an ideal home since we aren’t extremely close to fresh water (about .5 mile from a lake), but I’d like to attract bats if we can to deal with the insects naturally. I’m debating what size house we should mount. Purely for aesthetics, I’d prefer to attach it to the side of our house (gets terrific sun and wouldn’t be unsightly to neighbors) but concerned about the amount of bat droppings. Any suggestions?
Hello Christi- I suggest placing 2x4 spacers on the building, then the bat house on those spacers. Bat urine will then not be running down the siding. You will still get guano splattered on the siding, and a small amount directly under the bat house. The siding could be washed once or twice a season if desired, being careful not to spray water into the bat house. If it becomes "too many" bats, you can move the bat house to a location on a post the receives similar sunlight up to 300' away and bats should still take to it.
I am looking for a bat house for my dad's birthday next week and wondering what your turnaround time is for shipping?
Any item that is in stock usually ships the next 1-2 business days , then allow a few days for UPS Ground. Some bat houses occassionally need a week or two lead time, particularly the Universal 4 Chamber (if so, it will indicate on the website description page).
Can this be purchased in black?
Hello - all of our wooden bat houses are shipped unpainted; you should select a paint for your area, then add the included roof shingle to finish.
I am trying to purchase 5 double chamber bat houses (assembled with pole mount kit) and it will only let me add 4. Do I need to do two separate orders or can I do a custom order of 5?
That error message is because right at this moment we are only showing 4 left in the online inventory. This may not actually reflect how many we have in stock (there may be more rather than less), and we can replensih these quickly within ~1 week or so because they are made in house. For exact stock call Jenni at 717-241-2228 between 9-4 EST.