Refelt a Shed Roof: A Practical Guide to Adding Roofing Felt
The shed roof offers a simple, affordable shelter, but over time the felt underlayment wears, cracks, or water can seep through. Refelting a shed roof restores weatherproofing, extends the structure’s life, and can be a DIY-friendly project with the right tools and precautions. This guide covers suitable felt types, preparation steps, installation methods, and maintenance tips to ensure a durable, long-lasting result.
Preparation And Planning
Before starting, assess the existing roof for damage such as rotten boards, loose nails, or missing fascia. Replace deteriorated decking and repair any leaks in the interior. Measure the roof area to determine material quantities, and check local codes for ventilation or drainage requirements. Safety comes first: use a sturdy ladder, wear gloves and eye protection, and work with a partner when possible. If the shed has a steep slope or high wind exposure, consider seeking professional help.
Materials And Tools
Choosing the right materials is crucial for a durable refelting project. Typical components include:
- Roofing felt: mineral-surface or organic felt designed for cold-applied asphalt, with a typical thickness around 30 to 40 pounds per square (psi) for small sheds.
- Roof cement or asphalt roofing adhesive: to seal edges and overlaps.
- Fiberglass or roofing nails with sealing heads for securing felt (check gauge recommendations).
- Starter strip and cap shingles or drip edge as needed for the edge protection and water runoff.
- Roofing tar or sealant for flashing seams or penetrations (chimneys, vents).
- Brushes, rollers, or a weighted roller to smooth and set the felt.
- Scissors or utility knife, measuring tape, chalk line, and a straightedge.
Material selection depends on climate and shed structure. In wet climates, a heavier mineral-s surfaced felt often lasts longer, while organic felts may suffice in milder regions. Ensure compatibility with any existing shingles or underlayers and follow manufacturer guidelines for overlap and set times.
Step-By-Step Installation Process
The following steps describe a typical refelting project for a single-slope shed roof. Adapt as needed to specific roof dimensions and local conditions.
- Remove loose debris and clean the roof surface. Inspect for damaged boards and replace as required.
- Install a drip edge along the lower edge to direct water away from the fascia. Secure with appropriate nails, spacing per manufacturer recommendations.
- Install a starter strip along the eave, extending slightly over the drip edge to prevent water infiltration at the edge. Use roofing nails or staples and sealant as directed.
- Unroll the roofing felt starting from the bottom edge. Align the felt squarely with the eave and measure a straight, clean line for cutting.
- Apply roofing cement or adhesive along the top edge of the starter strip. Position the first row of felt over the starter strip, then press to seat firmly, ensuring full adhesion and eliminating wrinkles.
- Continue with successive rows, overlapping the lower row by about 2 to 4 inches (5 to 10 cm) depending on manufacturer guidelines and wind exposure. Smooth out air pockets as you go with a roller or brush.
- Overlap seams in the same direction for water run-off. At all hips, ridges, and penetrations, cut and fit the felt precisely, then seal seams with roofing cement or approved sealant.
- Install edging and flashing as needed, ensuring water is directed away from joints and fasteners. Inspect all seams for gaps and reseal if necessary.
- Test for wind resistance by gently lifting edges in a controlled manner. If any sections peel, re-secure and re-seal promptly.
Fastening And Sealing Best Practices
Proper fastening and sealing prevent wind uplift and water intrusion. Use nails or staples recommended by the felt manufacturer, with heads large enough to form a good seal. Do not over-tighten fasteners, which can damage the felt. Apply sealant along all seams, edges, and penetrations to create a continuous barrier against moisture. If the shed has multiple roof planes, use continuous felt sheets where possible to minimize joints and potential leaks.
Ventilation And Drainage Considerations
A well-ventilated roof helps extend the life of the felt by reducing condensation. Ensure sufficient airflow at the eaves and ridge if the shed roof design allows. For flat or low-slope sheds, add a small amount of ventilation to prevent moisture buildup under the felt. Adequate drainage is essential: confirm that gutters or downspouts are clear and functioning to carry water away from the shed foundation.
Tips For Durability And Longevity
To maximize the lifespan of the refelted roof, consider these tips:
- Choose high-quality roofing felt with proper cold-weather performance for the local climate.
- Inspect after heavy rains or windstorms to catch and fix loose edges early.
- Keep tree limbs away from the roof to reduce debris accumulation and potential punctures.
- Periodically check the flashing around vents, chimneys, and skylights and reseal as needed.
- Plan a future assessment after severe weather to determine if additional reinforcement is required.
Common Issues And Troubleshooting
Refelting is generally reliable, but a few problems can arise. Warped or loose decking can create air pockets and bubble formation under the felt. Inadequate overlaps or improper sealing can lead to leaks at seams. Wind uplift may detach edges if nails are insufficient. In colder climates, brittle felt may crack; if this occurs, replace affected sections to preserve performance. Regular inspections help catch issues before they escalate into larger repairs.
Maintenance Schedule
Establish a simple maintenance routine to protect the roof’s integrity. Perform a visual inspection twice a year, with additional checks after storms. Clean gutters and drainage paths to prevent ponding. Re-seal any joints or penetrations as needed and replace damaged felt promptly to avoid water damage to the shed’s interior and framing.
Frequently Asked Questions
What is the typical lifespan of refelted shed roofs? Most durable felt systems can last 5–10 years in moderate climates, longer in drier environments with proper maintenance. Can I install felt directly over existing shingles? It depends on the roof condition; if shingles are loose or damaged, remove them first for a proper seal. Is special equipment required for installation? Basic tools suffice, but a sturdy ladder and a helper greatly improve safety and efficiency. Should I hire a professional for refelting a shed roof? For complex roofs, steep pitches, or high-wind areas, professional installation ensures proper sealing and durability.