Tree Creepers build their nests in tight spaces, so this triangle – shaped house is a perfect fit. Lineseed oil rubbed on the out side of the house (never the inside) is a natural method of weatherproofing. Attach this house to the trunk of a tree 8 to 15 feet off the ground rather than a branch. These birds spend most of their time searching for insects in the trunks of trees, so they’re more likely to nest in a house close ot their food source.