Stopping a treatment does not automatically remove residues from the store. They can persist in building materials and dust and contaminate a later crop. Treat sprout control and assessment of the store’s cleanliness as separate tasks. The fact that a treatment once worked does not establish that the building is suitable for the next season.

High relative humidity helps keep tubers from drying out, but water should not drip onto them from the roof. Condensation forms when moist air meets a sufficiently cold surface. A thermal bridge or air leak can create such a spot even in a generally well-insulated store.

Look for uneven temperatures and airflow, especially in corners, around ceiling edges and near the door. Drying out the entire store can increase crop weight loss. First locate the source and rule out a roof leak. Distinguish liquid water on the tubers from humid air around them: these conditions may need different responses.

Freshly harvested potatoes need different handling from crops in long-term storage. Drying, wound healing, gradual cooling and maintaining storage conditions are distinct stages. Use the condition of the tubers to decide when to move on. A fixed setting without observation can cause further losses. Tubers continue to release heat, so controlled airflow must complement the insulated enclosure.

The target temperature also depends on the intended use. Seed potatoes, table potatoes and crops for processing do not necessarily need the same conditions. Design the building around the storage process. Construction materials help maintain the chosen conditions; they do not determine the correct settings for every batch.

Uninsulated metal sheeting can heat up and cause large temperature swings below the roof. A poorly sealed door admits air as the wind changes. Both place uncontrolled demands on the ventilation system. PIR insulation boards or sandwich panels can reduce fluctuations when they form a continuous enclosure around the store.

Insulating a large surface is only part of the job. Floor junctions, service penetrations and the edges of openings also matter. A small gap at a frequently used door can cause more trouble than slightly higher thermal conductivity in a wall. Inspect the whole building, rather than looking only at the type of panel.

A building used for many seasons may retain traces of former storage treatments. An empty store is not necessarily free of contamination. Residues may be present in dust and building materials. Assessment depends on knowing the building’s past use and choosing an appropriate cleaning procedure.

New lining does not establish that a food product is safe. Appropriate tests and the applicable maximum residue levels matter. Not every detectable trace has the same legal implications. The extent of cleaning and the future use of the building require specialist assessment, particularly when the store is being repurposed: requirements can differ between crops.

Record temperature and humidity in several locations and log ventilation run times. Compare the readings with the weather, door openings and crop condition. A recurring problem in one corner calls for inspection of that junction. If the whole pile is affected, investigate airflow. Mark measurements and observed losses on a simple plan of the store. This helps the designer locate problems and makes it easier to tell whether a repair worked.

Use these observations to prioritise spending. Fixing a leak, sealing a door, altering the air ducts and insulating the roof can have different priorities. PIR is a useful choice when it addresses an identified thermal problem. Lasting reductions in crop losses depend on the building, equipment and operators working together.