Mulch against siding is a moisture sandwich
Bark piled against wood, fiber cement, or stucco holds water and hides pests. Inspectors and termite companies look for soil or mulch contacting siding. Leave a clear inspection gap at the foundation when you spread.
Practical clearance rules
Local termite practices vary — when in doubt, leave a visible band of foundation clear. Edge the bed with edging options so bark stays put.
- Keep mulch several inches below the bottom of siding / stucco weep screed
- Do not bury siding, brick ledges, or hose bibs
- Pull mulch back from wood steps and deck posts
- Use rock or bare soil strips against the foundation if you want a neat edge
- Slope grade away from the house under the mulch layer
How this changes your yardage
A clearance strip slightly reduces bed area — measure the planting bed, not the entire strip to the wall. Recalculate in the mulch calculator if you carve out a rock border along the house.
Fixing beds that are already piled high
Rake mulch down and away from siding; check for soft wood or mud tubes. Refresh the bed with even spreading and proper depth from mulch depth.