How to Predator-Proof a Chicken Coop Floor (Hardware Cloth Underlay Spec)

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Install 1/2-inch welded hardware cloth under the floorboards or across open joists, stapled every 1–2 inches on every joist with washer screws at ends and every 12–18 inches, and turned 2+ inches up the wall plate so there is no rim gap. Cover bare wire with boards or deep bedding, and keep the exterior apron.

The bottom of the coop is a standard inspection point: University of Maryland Extension’s predator control guide says to inspect the bottom of the coop, patch any holes predators could use, and look for entry points larger than 1/4 inch.

Raised coops with open joists, rotting drop-board gaps, and plywood-only floors all leave a path under the hens’ feet. A solid wall and a clever latch do not matter if something comes up through the floor.

When You Need This

Use this when you are:

  • Building or retrofitting a raised coop and want mesh under the floorboards or across open joists
  • Closing dig-up / reach-up gaps after tracks or soil piles appear under the coop footprint
  • Replacing a soft chicken-wire floor that sagged, rusted, or got torn
  • Adding a hardware-cloth layer under new plywood or drop boards before bedding goes down

Skip this if diggers are working the outside run perimeter—that is still an apron job, not a floor underlay. Vents, windows, the night door latch, and run roofs are separate jobs.

Why Floors Fail While Walls Look Fine

Predators go under. A raised coop with bare joists is a ladder and a reach-up rack, and UC IPM’s raccoon pest note calls for open spaces beneath structures to be tightly screened with galvanized hardware mesh. Plywood with a rotten edge or an unmeshed clean-out gap is a pry start.

Soft hex chicken wire “floors” sag under bedding weight, then tear at the staple line. An apron around the run does not protect the coop footprint if the floor itself is open.

Rules of thumb that fail:

  • Open joists “because the coop is raised and nothing can climb that high”
  • Chicken wire stapled under the floor as the only barrier
  • Plywood floor with no mesh underlay and a soft, chewed, or gapped perimeter
  • Mesh that stops short of the wall line, leaving a rim gap for reach-through
  • Zip ties alone on joist bottoms; bedding load + climb pull walks them off
  • Treating the floor job as a substitute for the exterior dig-under apron

Spec: Mesh, Layout, Fasteners, Continuity

SpecTargetWhy
Mesh1/2-inch welded hardware clothStops dig-up and reach-up; same workhorse opening as walls
Layout A — under solid floorMesh on joists under plywood/boards, stapled/screwed to every joistBarrier stays even if boards warp or get replaced
Layout B — open-joist floorMesh across joist bottoms (or tops if no boards), pulled flatCloses the raised-coop undercroft without soft hex sag
Joist fasteningStaples every 1–2 inches along every joist the mesh crosses; washer screws at ends and every 12–18 inchesFloor mesh sees bedding weight + upward pry
Wall continuityMesh turns up the wall plate 2+ inches or laps wall mesh 2–4 inchesNo rim gap at the floor/wall corner
Panel overlaps on floor2–4 inches, tied and fastened on a joist when possibleSame seam rules as wall joins—no mid-span butt gap
Bedding / wear layerCover mesh with boards, linoleum scrap, or deep bedding so hens do not stand on bare wire long-termComfort + keeps manure off the wire crowns
Optional clean-out doorMesh the door leaf and frame the same as the main coop doorA soft clean-out is a floor-height breach

Do not use insect screen, soft hex chicken wire, or bird netting as the floor barrier. Do not leave a daylight rim between floor mesh and wall mesh. Do not skip the exterior apron just because the floor is meshed.

Raised coop vs slab-on-grade

  • Raised wood coop (most backyard builds): mesh under boards or across joists, continuous to walls
  • Slab or solid concrete floor: mesh underlay is usually unnecessary for dig-up; still mesh any drain openings, and run an apron at the exterior sill if the run attaches
  • Dirt floor coop: install hardware cloth across the footprint (buried or under a deep-bedding layer) and tie into wall mesh; pair with the exterior apron so diggers cannot flank the underlay

Install Path (Floor Underlay)

1. Choose layout and measure the footprint

Decide Layout A (mesh under a solid floor) or Layout B (mesh as the open-joist barrier). Measure inside the sill plates: length × width, plus 2–4 inches on each side for wall turn-up or wall-mesh lap. Count joists so every panel edge can land on wood.

2. Cut panels and plan 2–4 inch overlaps

Wear gloves and eye protection. Cut 1/2-inch hardware cloth to the footprint with lap and turn-up allowance.

Where two floor panels meet, plan a 2–4 inch overlap on a joist—same seam discipline as wall joins. Deburr wires that would sit under bedding or against hens’ feet.

3. Fasten to every joist—start at the center, work out

Pull the first panel flat. Staple every 1–2 inches along each joist the mesh crosses. Add washer screws at panel corners, at each joist end, and every 12–18 inches on long joists.

For Layout A, install the plywood or boards over the mesh after the underlay is tight. For Layout B, keep the mesh flat with no soft mid-span belly—add a mid-joist sister if a bay is wide enough to sag.

4. Turn up at the walls and close the rim

At each sill, turn mesh up the wall plate at least 2 inches and staple every 1–2 inches, or lap the floor mesh onto the existing wall mesh by 2–4 inches and fasten through both layers into the plate. From outside (or from under a raised coop), check for a rim light gap—if daylight shows at the floor/wall corner, add a washer-screwed patch.

5. Mesh clean-out doors and drop-board gaps

Any floor-height clean-out, egg-access, or drop-board opening gets the same 1/2-inch mesh and latch discipline as the main coop door. Do not leave a soft flap under the roosts—that is the breach predators find after the people door is fixed.

6. Cover for hen comfort, then undercroft pull test

Add boards, a sacrificial wear sheet, or deep bedding over bare wire so birds are not standing on mesh crowns all day. From under a raised coop, push and pull on mid-bay mesh and every rim—any lift means more washer screws. Confirm diggers still cannot flank the coop via the run perimeter; finish or verify the dig-under apron.

7. Match the rest of the coop

A hard floor under soft walls, an open roof, or a weak door only moves the breach. Finish the walls, the roof, the vents, and the night door latch.

How Much Mesh for the Floor Alone

Floor underlay is usually one or two panels from the same 1/2-inch roll used on the walls. Rough check:

(coop_length_ft × coop_width_ft) × 1.20 ≈ sq ft for floor + turn-ups/laps

Example: a 4×6 foot coop → 24 sq ft × 1.20 ≈ 29 sq ft. That is a modest cut from a 36" × 100' roll (~300 sq ft). Cut the floor from the same roll as the walls and apron, never from a soft hex remnant.

Required Hardware

VEVOR 1/2-inch hardware cloth, 36 in × 100 ft, 19 gauge hot-dipped galvanized, for coop floor underlay

This is the workhorse 1/2-inch roll for coop floor underlay and the wall mesh it laps into. Cut the floor panel so every joist gets a real fastener line, the rim laps the walls, and dig-up paths under the hens close for good.

Use it when: you are predator-proofing a chicken coop floor and need stiff 19-gauge 1/2-inch mesh that will not sag between joists.

Common Floor Mistakes

  • Open joists with no mesh. Reach-up and climb-under win on a quiet night.
  • Soft chicken wire as the floor. It sags, tears, and becomes a trampoline breach.
  • Mesh that stops short of the wall plate. The rim gap is the new door.
  • Zip ties only on joist bottoms. Bedding weight and pry force walk them off.
  • Hard floor while the exterior apron is missing—diggers flank the underlay from the run.
  • Floor done while walls, roof, vents, or the coop door stay soft—predators move to the next opening.

Quick Floor Checklist

  • 1/2-inch welded hardware cloth under boards or across open joists
  • Staples every 1–2 inches on every joist; washer screws at ends and every 12–18 inches
  • 2+ inch wall turn-up or 2–4 inch lap onto wall mesh; no rim daylight
  • Floor panel overlaps 2–4 inches on a joist; no mid-span butt seams
  • Clean-out / drop-board openings meshed and latched
  • Wear layer or deep bedding over bare wire; undercroft pull test passed
  • Exterior apron, walls, roof, vents, and door still get their own jobs

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