Cover the top—not the whole stack

EPA guidance says to store wood outdoors, off the ground, with only the top covered because covering the sides traps moisture.

The goal is a small rain-shedding roof over a stable stack, not an airtight wrap.

Backyard tarp arranged as a sloped outdoor cover
A sloped top cover sheds rain while open sides allow air to move through the stack.

Measure the top footprint

  1. Measure stack length and top width.
  2. Add modest overhang at both ends and both sides to move water clear of the wood.
  3. Allow for a raised center, ridge board, or support that creates drainage slope.
  4. Choose attachment points that do not pull the stack over or create trip hazards.

For a simple top sheet, minimum length = stack length + two end overhangs. Minimum width = the sloped top path + two side overhangs. Avoid full height drops.

FIELD DIAGRAMFlat cover measurement
Flat cover measurementAdd working allowance at both ends and both sides—not just once.OBJECT LENGTHTARP LENGTHALLOWANCEALLOWANCE
Add working allowance at both ends and both sides—not just once.

Keep the sides open

Place the stack off the ground on a stable base and leave gaps for airflow. Do not let a tarp sag against the sides or collect water. A loose full wrap can trap moisture and flap against the wood.

Wind needs a plan

Use a small cover, smooth slope, and suitable attachments. Heavy objects placed loosely on top can fall; ropes and loose corners can create hazards.

Choose material for the real job

A lightweight PE tarp is a common top-cover starting point because it is easy to reposition. Canvas may breathe but its rain resistance and treatment vary. Mesh does not provide a solid rain barrier. Whatever the family, inspect holes, seams, and tie points.

Seasonal checks

  • Drain standing water and correct sagging.
  • Keep the bottom of the stack dry and ventilated.
  • Repair sharp protrusions and loose corners.
  • Check moisture before burning; EPA says wood burns best below 20% moisture content.

Source: US EPA Best Wood-Burning Practices. EPA notes the Burn Wise material is now a historical record.

How this guide was prepared

We separate geometry and unit conversions from product claims, use exact standards where available, and flag specifications that vary by manufacturer. See our editorial policy for the review process.