The decision to rescrew a metal roof often arises from loose or missing fasteners, damaged washer seals, or aging panels. This guide provides actionable steps, safety considerations, and best practices to restore a secure, weather-tight roof. Proper resecuring extends the roof’s life, reduces leaks, and preserves warranty where applicable. Read on to understand when resecuring is appropriate, how to do it correctly, and how to maintain the roof afterward.
Assessing The Need To Rescrew
Before starting, evaluate the extent of the problem. Look for loose or protruding screws, corroded washers, or visible gaps where panels meet. Inspect for rust around fasteners, distorted panels, or granule loss near the edges. If water infiltration is localized to a few fasteners, resecuring may be sufficient. Widespread panel warping, missing panels, or structural damage could require professional repair or panel replacement. Document problem areas to guide the repair plan and potential warranty implications.
Tools And Materials
Gather reliable tools and components to ensure a lasting fix. Essential items include:
- Metal roofing screws with asphalt or rubber washers (color-matched to the panels)
- Magnetic screwdriver or drill with a clutch
- Sealant compatible with metal roofs (if needed for re-sealing)
- Sealant or flashing tape for water barriers
- Rag or mineral spirits for cleaning
- Ladder, safety harness, and non-slip footwear
- Marker or chalk line for alignment
- Touch-up paint or sealant to protect bare substrate
Choose fasteners appropriate for the existing roof material (e.g., steel, aluminum) and current thickness. Stainless steel or coated screws resist corrosion and extend fastener life. Ensure washers compress properly without cracking when tightened.
Step By Step Process
1. Safety And Access
Set up safe access to the roof. Use fall protection such as a harness and secured anchor point. Work during dry, mild weather to prevent slips. Have a helper on the ground to manage tools and monitor conditions.
2. Locate And Mark Problem Areas
Use a magnet or visual inspection to identify suspected fasteners. Mark each location with chalk or a marker. If a fastener is missing, replace it with a new screw of the correct length and type. Do not over-tighten, which can strip the hole or warp the panel.
3. Remove And Replace Fasteners
Loosen and remove the suspect screw. Clean the area, then reinsert a new screw with a washer. Tighten until the washer compresses evenly without deforming the panel. Install screws in the same pattern as existing fasteners, maintaining consistent spacing to avoid leaks.
Tip: If the washer is damaged or rubber deteriorates, replace both the screw and washer to restore a water-tight seal.
4. Inspect Seals And Edges
Check the gasket or washer seal around each fastener. If you see cracks or shrinkage, reseal with compatible sealant or flashing tape. Pay attention to ridge lines and panel overlaps where water tends to accumulate.
5. Address Damaged Panels
For bent or dented panels near fasteners, gently reshape with minimal force or replace the affected panel if necessary. Do not force panels back into place, which can create new gaps and leaks.
6. Clean Up And Final Check
Wipe down exposed metal to remove oil or lubricant residues that can attract dirt. Perform a water test by running a spray along seams to confirm all fasteners are sealed. Recheck for loose screws after a few rain cycles.
Common Mistakes And How To Avoid Them
- Over-tightening screws, which can strip holes or deform panels. Avoid using excessive force and rely on a snug, even seal.
- Using incompatible screws or washers. Use hardware specified for the roofing material and climate.
- Neglecting underlayment or flashing. Ensure proper flashing at transitions and edges to prevent leaks.
- Ignoring corrosion signs. Replace severely corroded fasteners to protect the roof structure.
Maintenance After Re Screwing
After resecuring, schedule periodic inspections—especially after heavy storms or freeze-thaw cycles. Clean debris from fastener lines to prevent moisture buildup. Repaint or touch up exposed metal to slow corrosion and maintain aesthetics. Keep a log of fastener locations and replacement dates for warranty documentation and future maintenance planning.
When To Call A Pro
Professional help is recommended if there is extensive panel damage, multiple missing fasteners, significant corrosion, or signs of underlying structural issues. A contractor can assess panel integrity, confirm warranty eligibility, and advise on replacement options if resecuring is insufficient.