Experts in New Zealand typically use various techniques to identify leaky roofs. Here are some common methods they employ:

1. Visual Inspection: Experts visually inspect the roof, both from the ground and by climbing onto it if necessary. They look for signs of damage, such as missing or damaged shingles, cracked tiles, deteriorated flashing, or gaps in the roof structure.

2. Water Testing: In some cases, experts may perform water tests to locate the source of a leak. They use water hoses or simulate rainfall to observe the path of water entry and identify potential areas of weakness.

3. Thermal Imaging: Thermal imaging cameras can be used to detect temperature differences on the roof’s surface. By identifying areas of heat loss or moisture intrusion, experts can pinpoint potential leak sources.

4. Moisture Meters: Moisture meters are useful for detecting moisture levels within the roofing materials. They help identify areas where water may be penetrating and causing leaks.

Once a leak is identified, experts take appropriate measures to fix it. The specific repair process depends on the nature and severity of the leak, as well as the type of roofing material. Here are some common steps:

1. Temporary Measures: In case of an active leak, experts may initially employ temporary measures to minimize water intrusion. These could include using tarps, sealants, or temporary patches to prevent further damage until a permanent fix can be implemented.

2. Repairing Shingles or Tiles: If the leak is due to damaged shingles or tiles, the affected pieces are replaced. Cracked tiles may be repaired with adhesive or replaced entirely. Similarly, damaged shingles are removed and replaced with new ones.

3. Flashing Repair or Replacement: Flashing, which is the metal or waterproof material installed around roof openings and transitions, is crucial for preventing leaks. Damaged or deteriorated flashing is repaired or replaced to ensure a watertight seal.

4. Sealant Application: Experts use appropriate sealants to seal gaps, cracks, or joints where water may be entering. This could involve applying roofing cement, silicone, or other suitable sealant materials.

5. Roof Deck Repair: If the leak is caused by a damaged roof deck, such as rotten or weakened sections, experts repair or replace the affected areas to restore structural integrity.

6. Gutters and Downspouts: Leaks can also occur due to damaged or clogged gutters and downspouts. Experts inspect and repair or replace these components as necessary to ensure proper water drainage.

It’s important to note that these steps are general guidelines, and the actual repair process may vary based on the specific circumstances and the recommendations of the roofing expert. It is always advisable to consult with a professional roofer who can provide an accurate assessment and appropriate solutions for your specific situation.