Understanding Built-Up Roofs (BUR)
Built-up roofs (BURs) have been a staple in commercial roofing for decades due to their durability and weather resistance. Constructed with multiple layers of roofing felt and bitumen, these roofs offer excellent waterproofing qualities and reflectivity. However, like any roofing system, BURs may require repairs over time due to wear and tear, exposure to elements, or other unforeseen damages. This guide will walk you through the process of repairing a built-up roof, ensuring you restore its integrity.
Steps to Repair a Built-Up Roof
1. Assess the Damage
Before diving into repairs, it’s crucial to evaluate the condition of the roof. Look for:
- Blisters: Bulges that form when moisture gets trapped under the membrane.
- Cracks or Splits: Common in aging roofing materials.
- Ponding Water: Standing water that could indicate drainage issues.
- Loose or Broken Flashing: Areas where the roof meets vertical surfaces that can allow leaks.
2. Gather Necessary Tools and Materials
To ensure you are well-prepared for the repair process, gather the following tools and materials:
- Roofing felt or membrane
- Bitumen (hot or cold applied)
- Tar or roof cement
- Putty knife
- Roof broom or brush
- Utility knife
- Safety ladder
- Safety gear (gloves, goggles, etc.)
- Torch (if using hot bitumen)
3. Prepare the Area
Before you begin repairs, clean the roof area where you will be working. Remove debris such as dirt, leaves, and other materials using a roof broom or brush. This ensures a clean surface for adhesive application and helps prevent future problems.
- Inspect Flashing: Ensure that all flashing is secure and in good condition.
- Remove Damaged Material: Cut away any blisters, cracks, or damaged sections with a utility knife.
4. Repair Blisters
Blisters can be a common issue on BURs, and addressing them promptly can prevent leaks:
- Cut the Blister: Use a utility knife to slice through the blister to release trapped moisture.
- Dry the Area: Allow the area to dry completely.
- Apply Bitumen: Fill the area with hot or cold bitumen and flatten it down.
- Cover with Roofing Felt: Place roofing felt over the blistered area and seal it with additional bitumen.
5. Fix Cracked Sections
For cracks or splits, the same preparatory process applies before embarking on repairs.
- Cut and Inspect: Cut out a section around the crack to ensure you are not sealing in moisture.
- Apply Roof Cement: Use a putty knife to spread roof cement into the crack. For deeper cracks, you might need to cover it with a piece of felt.
- Seal with More Bitumen: Apply another coat of bitumen to ensure a waterproof seal.
6. Address Ponding Water Issues
Ponding water can lead to severe structural damage. If your assessment identifies any areas where water pools:
- Determine Cause: Often, the cause is inadequate drainage or a low spot on the roof.
- Install Drains: If needed, install new roof drains or sumps and make sure existing ones are clear of debris.
- Regrade the Surface: If necessary, add roofing material to create a slope towards the drainage areas.
7. Reinforce Flashing
Check flashing along parapets, curbs, and equipment bases:
- Replace Damaged Flashing: Remove worn or cracked flashing and replace it with new material.
- Seal Edges: Use a liberal amount of roofing cement to seal the edges of your new flashing to prevent leaks.
8. Final Seal and Inspection
After completing repairs, it’s crucial to seal everything again to ensure longevity.
- Apply a Final Coat: Using a brush or roller, apply a final coat of bitumen to all repaired areas.
- Conduct a Thorough Inspection: Check for any missed spots, ensuring all repairs are well-executed and complete.
Conclusion
Repairing a built-up roof can seem daunting, but with careful assessment, appropriate materials, and the right techniques, you can effectively restore the roof’s integrity. Regular inspections and maintenance can also prolong its lifespan. Remember, if the repairs feel beyond your skill set, don’t hesitate to reach out to professionals for assistance. For expert roofing services, consider checking out Roofing Near Me for Work.
FAQs
Q1: How often should I inspect my BUR?
A: It’s recommended to inspect your BUR at least twice a year, ideally in spring and fall, to catch any potential issues early.
Q2: Can I make repairs myself, or should I hire a professional?
A: If you have experience and proper safety gear, some repairs can be done yourself. However, for extensive damage or if you’re unsure, hiring a professional is advisable.
Q3: What are the signs that my BUR needs replacement instead of repair?
A: Signs include extensive water damage, significant wear across multiple sections, or failing seams. If repairs are frequent and costly, it may be time to consider a replacement.
Q4: How long does a BUR typically last?
A: A well-maintained built-up roof can last between 15 to 30 years, depending on the materials used and environmental factors.
Q5: Is there a way to prevent future damage to my BUR?
A: Regular inspections, proper maintenance, and prompt repairs are key to preventing future damage. Keeping drains clear and maintaining a proper slope for water drainage can also significantly reduce wear.
