Switzerlands Netstal Limestone can be used for exterior applications in cold climates, as limestone is known for its durability and resistance to weathering. However, it is important to consider a few factors when using limestone in cold climates:

1. Freeze-thaw cycles: In cold climates, water can seep into the pores of limestone, freeze, and expand, causing the stone to crack or spall over time. To mitigate this issue, choose a limestone with a low water absorption rate and ensure proper installation techniques, including adequate drainage and protection from water infiltration.

2. Frost resistance: Verify that the Netstal Limestone meets proper frost resistance standards. Limestone with good frost resistance will have a low potential for damage due to freezing and thawing cycles.

3. Surface treatment: Applying a suitable surface treatment, such as a water repellent or sealant, can help protect the limestone from water penetration and reduce the risk of damage in cold climates.

4. Maintenance: Regular maintenance is crucial to ensure the longevity of limestone in cold climates. This may include periodic cleaning, inspection for cracks or damage, and prompt repair if necessary.

By considering these factors and consulting with a local expert or stone supplier, you can determine if Netstal Limestone is suitable for your specific exterior application in a cold climate.