Core samples made simple

By Dani Sheehan. 

KARNAK repair products make it easy to inspect roofing insulation while keeping systems watertight. 

When it comes to evaluating a commercial roofing system, core samples are the gold standard. They give a true cross section of the roof assembly and reveal what the eye can’t see from the surface. With the right process and repair products, contractors can properly inspect a roof without leaving it vulnerable to leaks from the core cut. 

Why core samples are important 

Core cuts answer the most important questions about a roof’s health: 

• They reveal hidden damage. From wet insulation to deteriorated materials, core samples expose issues that could compromise performance and shorten a roof’s lifespan. 
• They guide cost-effective decisions. By showing thickness, layers and overall condition, core cuts clarify whether repair, restoration or replacement is the best option. This helps building owners avoid unnecessary expenses. 
• They provide documentation. Core cuts create a record of the roof system’s composition and condition which can be useful for warranty discussions, insurance claims or code compliance. 

How to take – and seal – a core sample 

KARNAK’s step-by-step method for how to inspect roofing insulation ensures contractors can gather the information they need while keeping the roof watertight: 

1. Cut a hole in the roof system using tools such as a hammer, chisel, or axe. 
2. Remove the material carefully, exposing the insulation below. 
3. Inspect the material. If the insulation shows signs of moisture, that’s a red flag that repairs or replacements may be necessary. 
4. Repack the material back into the opening. 
5. Replace the cap securely. 
6. Repair the location with KARNAK repair products to restore a watertight seal. 

Some building owners worry that cutting into the roof will create leaks. When you follow the proper procedures and reseal the core cut with high-quality products, the process is completely safe. In fact, it’s the only way to get the full picture of a roof’s condition without the risk of guessing.