A Bluebird Home
I took a couple days in between furniture Projects to make a new bird house. Here’s the story.
Of all the delightful songbirds of New England, the Eastern bluebird (Sialia sialis) is my favorite. Not as charismatic as the feeder birds, not as regal as the robin, nor melodious like the wrens, bluebirds are, hands down, the most handsome. Of course, all of these descriptors are human-defined attributes that we project onto the creatures sharing our world. That’s okay if it helps us to appreciate their existence, and the valuable niches they inhabit alongside of our own. My wife and I enjoy promoting an environment where wildlife, and in particular birds, can thrive through the cultivation of native plants (aka weeds) in our gardens, augmenting the understory shrubs to create border sanctuaries, and by permitting much of our backyard to become an un-mowed meadow. Providing water sources and housing also helps to sustain an amazing variety of birds on our property: 44 different species have been recorded to date; 12 of which are verified nesters. As it turns out, bluebirds are especially reliant on human-made houses for they require a cavity, such as a hollow tree, in which to build their nest, and available cavities are scarce. Decaying trees tend to be removed before they can fall and cause property damage, and the hollowed ones that remain are hot commodities for a wide range of birds and mammals. Bluebirds hardly stand a chance. We have 2 bluebird houses in our yard that have hosted their namesake families, as well as chickadees, house wrens, tree swallows and (ahem) house sparrows over the past two summers. They are each booked 2 or 3 times during the busy season of April through July and also serve as a shelter for many species over the winter months. One of these structures had developed a crack in the roof board and upon closer inspection was generally rotting away. Time to build a new house!
Design
Birdhouse design follows some rather strict dimensional constraints that vary depending on the species you seek to accommodate. The entrance hole diameter, height of that hole above the floor and the inside floor dimensions are key. Fortunately, these parameters have been worked-out empirically for all of the box-nesting birds and you can find them listed in many reference books and websites. The remaining house features are secondary and, in general, less is best. For this bluebird house there will be nothing cute or gingerbread. No perch, no paint. In addition to the appropriate “box”, the proper habitat and height above the ground are important factors for nesting success. Bluebirds like to be out in the open and about 5 feet off of the ground - easily done. Two distinct bluebird house designs have evolved over the years and you have probably seen them both if you look about roadside fields and fence lines. I have chosen the simpler of these in an attempt to duplicate (with improvements) the house that I am replacing. The plan comes from an amazing book found for $1.00 at the annual Harvard, MA library book sale: Woodworking for Wildlife by Carol L. Henderson. This beautifully illustrated and informative work was produced by the State of Minnesota, Department of Natural Resources, specifically funded by the proceeds from that checkbox on the State’s tax forms. Hunh?! Anyway, I will be following their crystal-clear plan which “… may be reproduced for non-web educational purposes only.” Sorry. Just get the book, you’ll like it!
Materials
The beauty of this birdhouse plan is that in can be constructed entirely from a 1 in. x 6 in. x 6 ft. long piece of lumber, provided you make no mistakes along the way. I bought an 8 footer. Their box is fastened by nails, but I will use steel screws to match the expected longevity of the rot-resistant Western red cedar wood.
Dimensioning
The box is constructed of six parts, all 11/16 in. thick and 5 1/4 in. wide (i.e., the actual dimensions of my nominal 1 x 6 board). That means five chops at the miter saw and a rip cut to narrow the floor board is the extent of “woodworking for wildlife” to be enjoyed on this one. Take it slow; make it last. There is also some drilling to create the entrance hole and floor drains which was accomplished at the drill press. A hand saw and hand held drill would also have done the trick, so if you have any tools, and are so inclined, I encourage you to make your version of this house and mount it somewhere before Spring comes.
House parts
Assembly
Assuming squarely cut materials birdhouse assembly is a matter of lining things up appropriately and then fastening the parts together. I started with the floor board which is elevated about 3/4 in. off of the “true” bottom to avoid moisture creep from the walls. The floor is attached to the front, back and left side walls with 2 screws per side. The right wall will hinge and thereby serve as an opening for nest inspection and clean-out. It was attached to the front and back by using two stainless steel pan head screws affixed near the top. These screws need to be co-linear for they serve as a pivot hinge. The left side was then screwed to the front and back to complete the cavity. The roof comes next. I had toyed with a pitched roof, similar to the old house being replaced, and had even cut the appropriate parts at a 10 degree angle to make this happen, but the dry-fitted structure looked somehow “uppity”, whereas, the flat posture appeared more “welcoming” (now applying human-defined attributes to the inanimate). And since shedding rain on a surface this small is secondary to the hunting perch function served by bluebird house roofs I re-cut the parts square and went with that form. After creating a small ventilation space between the top of the walls and ceiling the roof was screwed into place. I chose to countersink the screws connecting the body of the house and then filled these divots with cedar plugs to enhance the look, however, I kept the roof screws accessible, just in case it needed a replacement before the rest of the dwelling succumbed. Finally, a small screw hook was installed to act as a door latch and the house was then bolted to that rusty pole in the front yard. A couple hours later we spotted a happy bluebird couple beginning to establish their squatter’s rights.
“Everything is satisfactch'll”!
