Housing Guidelines for the Birds
Important Do's and Dont's
1. Don't build a house just for birds. Build houses, nesting boxes, and other structures with specific types of birds in mind because each species has different size and entrance-hole requirements. See the chart below for suggested dimensions and allowable entrance-hole sizes for songbird species. (A hole cut to the correct size keeps unwanted birds out. For instance, sparrows will enter holes 1-1/4" and larger.) Drill all holes -- entrance and ventilationat a slight upward angle to prevent rain from blowing in.
2. Wood is the preferred material for birdhouses. Metal does not provide heat insulation. But use only pine, cedar, redwood, or cypress not treated wood or plywood for functional birdhouses.
3. Assemble cedar and redwood birdhouses with galvanized screws or concrete-coated or ring-shank nails. If you don t, the joints will eventually loosen. For pine houses, use standard fasteners.
4. Always build the birdhouse so that the sides enclose the floor. This keeps rain from seeping into the sidewall/floor joint. To slow deterioration of the floor, recess it 1/4".
5. Make the front edge of the birdhouse roof overhang at least 2". The overhang protects the entrance hole from rain and keeps predators from reaching in from above.
6. So that you can clean out birdhouses semi-annually (before and after nesting season), always build them with a hinged side or roof. Use rust-proof hinges and either a screw closure or a pair of roofing nails and wire to discourage raiding by raccoons.
7. Drill at least four 3/8"-diameter drain holes in the bottom of a house (except on some special designs for bluebirds and wood duck nest boxes). Drain holes allow rain and condensation to escape. Clear them every time you clean the house.
8. For ventilation in all birdhouses (except duck boxes), drill at least two 5/8" holes near the top on both sides. Wood provides great insulation, but interiors can overheat.
9. Never put a perch on a birdhouse. Perches encourage sparrows and European starlings, which compete with -- and often kill -- songbirds.
10. Do not paint, stain, or treat with preservative the inside of a birdhouse. You may coat the outside back of a birdhouse (the most prone to rot) with preservative, or paint the entire exterior.
11. Firmly attach all houses to a support post, building, or tree. If you think that cats and/or raccoons will be a problem with a post mount, discourage them with sheet-metal shields tacked to the post. Or, smear the post with grease. Wren houses can swing suspended from an eave or tree limb with a two-point suspension system.
How high to mount a birdhouse? Most songbirds nest in a range of from 4 15' above the ground. Remember, though, that you need to reach it for cleaning. And remember to provide shade for at least part of the day.
12. To avoid territorial fights, space houses for songbirds at least 20' apart. Space bluebird houses 100 yards apart. Purple martins and wildfowl, such as wood ducks, don't defend their territories.
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