What Fascia and Soffit Do
- Fascia. InterNACHI describes it as the board that caps the rafter ends and may hold the gutter. Because it sits at the roof's lowest edge, InterNACHI notes fascia can act like a sponge for misdirected water, and rot there can hide rot in the rafter tails behind it.
- Soffit. The underside of the roof overhang. On homes with vented attics, it often holds the intake vents. ARMA notes intake vents are generally in the eave or soffit area and calls for balanced intake and exhaust. Our roof ventilation page covers why that matters in this climate.
Why They Fail in Albuquerque
Water at the roof edge. Even in a dry climate, monsoon storms bring heavy, fast rain. The National Weather Service has recorded rain rates of 3 to 4 inches per hour in Albuquerque storms. When water overflows a gutter or runs behind it, it soaks the fascia.
Missing or poorly installed drip edge. The 2021 IRC, which New Mexico adopts, requires a drip edge at the eaves and rakes of shingle roofs, extending at least 1/4 inch below the roof sheathing (R905.2.8.5). InterNACHI notes drip edge protects the sheathing and trim by directing water away. JLC has documented drip edge installed too tight to the fascia letting water run behind the gutter instead of into it. Drip edge wasn't required by the IRC until the 2012 edition, so many older homes don't have it.
Sun and paint failure. The USDA Forest Products Laboratory explains that ultraviolet light breaks down the wood surface, and paint over UV-degraded wood doesn't hold well. Once paint peels, water gets in, especially through end grain, which the Forest Products Lab says absorbs water 10 to 100 times faster than other faces.
Animals. NMSU Extension lists crevices in the soffit and fascia as common entry points for bats, which can use gaps as small as 3/8 inch. Birds and rodents use the same openings. NMSU notes bats shouldn't be excluded from May through August in New Mexico, while young are present.
Warning Signs
- Peeling or flaking paint, especially at board ends.
- Soft, dark or crumbling wood.
- Gutters pulling away or sagging.
- Water stains on the soffit.
- Gaps, missing sections or broken soffit panels.
- Nesting, droppings or brown staining below openings.
- Soffit vents blocked by debris, paint or insulation.
Fascia rot rarely stops at the fascia. This Old House notes visible damage is often only part of the problem, and replacing just the visible section can leave weakened wood behind. Check the rafter tails and roof sheathing behind it.
How a Lasting Repair Is Done
- Find where the water came from. A missing drip edge, an overflowing or mis-set gutter, a roof leak at the edge, or a sprinkler. Fixing the board without fixing the water brings the rot back.
- Open it up and check behind. Remove damaged fascia and soffit and inspect the rafter tails and sheathing. This Old House recommends replacing rotted rafter tails with pressure-treated lumber.
- Replace rotted wood. Prime new wood on all sides and seal cut ends before it goes up. The Forest Products Lab recommends sealing end grain and back-priming.
- Restore the roof edge. Install or correct the drip edge and rehang gutters with proper pitch.
- Keep vents working and screened. Where the attic is vented, the IRC (R806.1) requires ventilation openings to be protected against birds, rodents and other creatures, and R806.3 requires at least 1 inch of clearance between insulation and the roof sheathing at the vents. Not every house needs soffit vents: the IRC also permits unvented attic assemblies that meet its requirements (R806.5), so what's right depends on how your roof and attic are built.
- Finish for the sun. Paint with a quality exterior coating, or clad the fascia.
Metal cladding. Custom-bent metal over fascia can protect it from sun and water and match a metal roof. It should go over sound, dry wood. Wrapping rotted or wet wood hides the problem and can trap moisture. Timberwolf's Edgewood fascia and soffit project shows one example: broken soffit sections closed up and weathered fascia covered with metal bent to match the roof.
PVC trim. Cellular PVC trim doesn't rot, but it expands and contracts with temperature, so it needs proper fastening and, in dark colors, heat-reflective paint, per manufacturer guidance.
When to Do It
If the roof is being replaced, that's the best time: the drip edge goes on with the new roof, and fascia problems are easy to see. Otherwise, fascia and soffit repair is its own job and doesn't require touching a sound roof.
Timberwolf repairs fascia and soffit as part of roof repair. A Free Roof Report includes the roof edge, gutters, fascia and soffit.