PU Sandwich Panel: Factory & Warehouse Installation Guide

Thanks to good thermal insulation, moisture resistance and fast assembly performance, PU sandwich panels are widely applied for walls, roofs of steel‑structure factories and enclosures of constant‑temperature warehouses. The final service performance of PU sandwich panel largely depends on the complete workflow including material selection, incoming inspection, on‑site construction, sealing treatment and final acceptance. Improper operations may lead to water leakage, degraded insulation, panel delamination and even failure of fire‑safety and project acceptance. This practical workflow is prepared for engineering contractors and procurement staff for ordinary steel‑structure factory and constant‑temperature warehouse projects.

🔎 Step 1: Pre‑project selection of PU sandwich panel according to working conditions Material selection is the starting point of the project. Do not judge PU sandwich panel only by price. Confirm specifications of PU sandwich panel considering fire‑protection grade, humid South‑China climate and application for wall or roof.

For ordinary steel‑structure factory walls, B1 flame‑retardant PU sandwich panel with 50‑75 mm color‑steel facings is preferred. Factory roofs suffer stronger wind and rain impact, so 75‑100 mm PU sandwich panel is recommended to improve wind‑resistance, waterproof and thermal‑insulation performance.

Constant‑temperature warehouses demand higher insulation capacity. 75‑100 mm PU sandwich panel is suggested for walls, and 100 mm or thicker PU sandwich panel for roofs. For heavy‑dust or slightly corrosive conditions, choose stainless‑steel faced PU sandwich panel.

Important reminder: B2 combustible PU sandwich panel shall not be used for indoor enclosures of factories and warehouses. If Class‑A non‑combustible performance is required, switch to rock‑wool panels.

When you are confused about specifications, SAMZOON, the original manufacturer in Foshan, offers material‑selection advice for PU sandwich panel and supports free samples to reduce early‑stage selection risks.

✅ Step 2: Incoming inspection to control quality of delivered PU sandwich panel Before hoisting and installation after PU sandwich panel arrives on site, complete incoming inspection to prevent inferior PU sandwich panel from entering construction sites.

Check appearance: flat surface without collision damage or scratches; protective film intact; complete panel corners free from squeeze damage.

Check foam core: cut sample pieces of PU sandwich panel. Foam cells shall be fine and uniform without voids, blackening or yellowing. Metal facings shall bond firmly with PU sandwich panel core without delamination or hollow areas.

Check documents: verify panel thickness, fire‑retardant grade and facing material match purchase order. Never receive B2‑grade combustible PU sandwich panel for factory and warehouse projects. SAMZOON strictly inspects every batch of PU sandwich panel before delivery.

⚒️ Step 3: Standard on‑site construction and sealing for PU sandwich panel Handle PU sandwich panel gently during lifting and transportation. Avoid knocking, squeezing or bending PU sandwich panel, which may deform internal foam core and damage thermal‑insulation performance.

Adopt male‑female tongue‑and‑groove splicing for PU sandwich panel. Keep even joint gaps. Too‑wide gaps cause air leakage and water seepage; too‑narrow gaps bring extrusion deformation of PU sandwich panel. Minimize on‑site cutting. If cutting is unavoidable, fully seal cut edges to stop moisture penetrating into PU sandwich panel core.

Fill all joints with high‑quality weather‑resistant sealant. For roof PU sandwich panel, strengthen lap‑joint waterproof treatment. Poor sealing is the main cause of water leakage and early‑stage failure of PU sandwich panel. SAMZOON provides on‑site construction technical guidance for PU sandwich panel.

📑 Step 4: Completion inspection and acceptance of PU sandwich panel After installation of PU sandwich panel, carry out comprehensive acceptance work. Check surface flatness of PU sandwich panel, firm fixing condition, no delamination or hollow core. Inspect all joints for complete sealant without breakpoints or gaps, confirm no water‑leakage risk on walls and roofs. Verify actual thickness and flame‑retardant grade of PU sandwich panel comply with project requirements.

SAMZOON draws on abundant South‑China factory and warehouse project cases to assist customers in acceptance coordination and rectification suggestions for PU sandwich panel projects.

🛠️ Step 5: Basic routine maintenance to extend service life of PU sandwich panel Keep surface of PU sandwich panel clean. Avoid strong acid and alkali cleaning agents which may corrode facings and sealant. Periodically inspect sealant condition of PU sandwich panel joints. Re‑seal aging or peeled sealant timely, so PU sandwich panel can maintain stable thermal‑insulation and waterproof performance for long‑term operation.