Roof flashing protects your chimneys, vents, and skylights from water damage. Over time, weathering and age can damage it, leading to costly repairs. Knowing what to watch for and how to repair damaged roof flashing can save you both time and money.
1. Identify the Problem
Begin by thoroughly inspecting your roof flashing for common signs of damage.
- Rust or corrosion. This is especially common with metal flashing materials like galvanised steel or aluminium. Rust can weaken the metal, creating holes or gaps that allow water to penetrate.
- Cracks or holes. These can occur in any flashing material, including metal, plastic, or rubber. They may be caused by aging, extreme temperature changes, or debris impact.
- Loose or missing nails. Flashing is typically secured with roofing nails. Over time, these nails can become loose or fall out, causing the flashing to lift and allow water to seep in.
- Caulking issues. Caulk or sealant creates a watertight seal around the edges of the flashing. Dried-out, cracked, or missing caulk can compromise the seal and lead to leaks.
- Water stains. Stains on your ceiling or walls near chimneys, vents, or skylights often indicate flashing problems. These stains may be accompanied by peeling paint or a musty odour.
2. Gather your Tools and Materials
Once you’ve identified the issue with your flashing, gather the necessary tools and materials for the repair.
Safety gear:
- Include safety glasses, gloves, and a steady ladder.
Tools:
- A hammer is needed for nailing flashing.,
- A pry bar helps remove old flashing or lift shingles.
- A utility knife is useful for cutting flashing and shingles.,
- A caulk gun is needed to apply sealant.
- A putty knife helps scrape off old caulk and debris.
- Tin snips are necessary if you’re working with metal flashing and need to cut it to size.
Materials:
- If the existing flashing is severely damaged, you may need replacement flashing. Choose a material that matches your existing flashing and is compatible with your roofing material.
- You’ll also need roofing nails, cement to patch small holes or cracks, and sealant/caulk specifically designed for roofing applications.
3. Repair the Flashing
The repair method will depend on the type of damage and the flashing material. Here are some common repairs:
- Resealing. If the flashing is in good condition but the sealant has failed, carefully remove the old caulk using a putty knife. Clean the area thoroughly with a wire brush and a damp cloth to ensure good adhesion for the new sealant. Apply new roofing sealant in a continuous bead, providing a complete and watertight seal.
- Repairing minor damage. Small holes or cracks in the flashing can often be repaired with roofing cement. Clean the area around the damage, then apply the roofing cement liberally, ensuring it fills the gap and overlaps the surrounding area. For metal flashing, you may use a rust-inhibiting primer before applying the cement.
- Replacing damaged sections. If the flashing is severely damaged, you may need to replace the affected sections. Remove the old flashing using a pry bar, then install new flashing pieces and ensure they overlap correctly. Secure them with roofing nails and apply sealant around the edges to create a watertight seal.
- Addressing rust. For metal flashing, remove loose rust with a wire brush. If the rust has penetrated the metal, replace the flashing. If the rust is only on the surface, treat it with a rust-inhibiting primer and apply roofing cement or sealant to protect the metal and prevent further corrosion.
When to Call a Professional
While minor flashing repairs can often be tackled as a DIY project, there are certain situations where it’s wise to call a professional roofing contractor.
For example, if the damage to the flashing is extensive or affects the surrounding roofing materials, it’s best to have a professional assess and repair the issue to ensure it is done correctly.
Additionally, if you’re uncomfortable working at heights or have physical limitations that make it difficult to work on a roof, hiring a professional is always safer to avoid accidents.
A L King Roofing: Your Roofing Experts
If you live in the Melksham, Bath, or Bristol area and need assistance with your roof flashing, contact A L King Roofing. With over 40 years of experience in the roofing industry, we provide reliable, affordable, and high-quality roofing repair services.
Our roofing merchant centre in Melksham offers a wide selection of roofing materials, including flashing. Call 01225 705 918 to speak to a member of our team about your roofing needs.