Livestock Steel Structures · Poultry
Egg-Laying Poultry House — Steel Built to Beat Heat & Ammonia
A layer house has two silent enemies: midday heat that drops egg size, and ammonia that eats ordinary steel. This building is engineered against both — so the structure works for the flock 24/7, not just as a roof.
Widths 8–20 m open-sided to tunnel-ventilated | Lengths to 120 m matched to your cage rows | HDG Inside galvanized vs. ammonia, not painted | Cage-First Layout building fits your equipment |

Four Numbers That Decide Your Laying Rate — and What the Steel Does About Each
Hens don't read brochures; they respond to climate. Our building dimensions are set backwards from these four targets.
| Herd target | In numbers | How the building delivers it |
|---|
| Temperature | 18–27 °C comfort band | Wide eave overhangs shade the side walls; insulated or aluminum-foil roof panels kill radiant heat — above 27 °C, egg size drops before mortality does |
| Ammonia | < 10 ppm at bird height | Ridge + sidewall openings sized per flock count — air changes are designed with the frame depth, not guessed after erection |
| Air speed | 0.2–2.5 m/s, wind-tunnel mode in hot months | Length-to-width ratio kept tunnel-vent compatible (≈ 5:1…8:1); cooling-pad wall pre-framed even if pads come later |
| Light program | 16 h light / 8 h dark, dimmable | Light-tight end walls + curtain overlap designed so outside dawn doesn't steal your photoperiod |
Send flock size and your cage supplier's drawing — we reverse-engineer width, length, eave height and every opening from those two inputs. The house is built around the hens, and the hens around your cages.
"Paint Peels in a Layer House. Galvanizing Doesn't."
| Painted frame in ammonia air | Our hot-dip galvanized system |
|---|
| Scratches at every bolt-up; rust blooms from the scratch within 2–3 flock cycles | HDG (ISO 1461, ≥55 µm zinc) on purlins, girts, bracing & connectors — self-sacrificing at scratches |
| Repaint with chickens inside? Impossible — house must be emptied and disinfected | Primary frames: abrasive blast + zinc-rich primer + PU topcoat, or full HDG for high-humidity coastal farms |
One week of empty-house maintenance costs more than a whole year of feed savings — so we spec the corrosion system for a 30+ year structure life with zero in-flock repaints.
Specification & Reality

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| Item | Layer House Package |
|---|
| Structural system | Light steel portal frame or truss; bolted site assembly, no on-site welding |
| Dimensions | Width 8–20 m · length to 120 m · eave 2.7–4.5 m — set by flock size & cage layout |
| Roof / walls | 0.45–0.5 mm color steel (+ optional insulated panel / aluminum foil); galvanized side curtains, UV-stabilized |
| Ventilation openings | Ridge vent + sidewall curtain slots sized per air-change target; cooling-pad & fan wall pre-framed on request |
| Corrosion system | HDG secondary members standard (ISO 1461); frames blast + zinc primer + PU, or full HDG option |
| Biosecurity details | Personnel room & egg-collection passage framed at design stage; light-tight door sets |
| Loads & codes | Wind per ASCE 7-22 / EN 1991 (site-specific; cyclone zones reinforced) · AISC 360 / Eurocode 3 · ISO 9001 |
| Lead time | 20–35 days · T/T 30% deposit, 70% before shipment |
| A layer-house quote needs just three lines: |
| 1) number of hens (or cage rows × tiers) · 2) open-sided or closed tunnel — and your hottest month · 3) site city — design + BOQ come back within 24 hours. |