Boxes In Attic
If they are 2x6 you can probably get away with some boxes filled with relatively light stuff.
Boxes in attic. You want to make sure you can lift the boxes easily and if they happen to tumble over they don t hurt anyone. Whether a birds or moths in the attic a raccoon in the garage or mice in the basement critters aren t concerned with taking care of your belongings as a general rule of thumb nothing in your attic. A few more universal. Boxes also break down and disintegrate which will attract pests even more.
Think empty boxes and suitcases. Pests are attracted to the cardboard and to the glue used in construction of the box says santoro. Joists that are 2x8 or larger can likely support more weight. Those cardboard boxes stacked up in your attic could become a veritable buffet for mice and bugs if you re not careful.
Cardboard boxes will deteriorate due to heat and water and animals and bugs will snack on them in the meantime. Use the attic to store anything that is impervious to heat.