Why the roof edge rots first
The Wood Handbook singles out the roof edge. It names roof edges and the points where roofs interface with walls among the critical places for decay in a building, and its advice for keeping them dry is an overhang with gutters and downspouts kept free of debris. A fascia board sits at exactly that line: it takes the run-off, it carries the gutter, and the rafter tails behind it are end grain facing weather.
A blocked gutter turns a drainage detail into a soaking detail. Water that cannot leave the gutter sheets over the front edge and runs down the fascia, or backs up behind it onto the sheathing and the tail ends. Mature street trees put that condition on the same buildings each autumn, and the fascia is usually painted, so the wood behind the film stays wet without showing it.
Old painted trim brings two rules with it. Removing rotted fascia and soffit from housing built before 1978 disturbs paint that may contain lead, and the work follows the lead-safe work practices in the EPA's Renovation, Repair and Painting rules. The second rule is height. Almost all of this work happens from a ladder, a scaffold or a lift, and Cal/OSHA requires fall arrest, restraint or positioning for anyone exposed to a fall of more than 7 1/2 feet from an unprotected edge.
A soft fascia is a commonly controllable moisture condition, and the pest rules say so. They list commonly controllable moisture conditions that would foster the growth of a fungus infection materially damaging to woodwork among the conditions deemed likely to lead to infestation or infection, and they require that such a condition be corrected. An overflowing gutter is the plainest example on a building.
What fascia and eave repair includes
The gutter line, the fascia run and the soffit are checked from a ladder or a lift, the soft lengths marked, and the rafter tails behind them probed at the ends where the decay starts. The roof covering above the edge is looked at in the same pass.
The gutter comes down along the affected run so the fascia behind it can be seen and taken off, and the brackets and the fall are noted before it is re-hung.
Rotted fascia is cut out to sound wood at a scarf, and rafter tails that have gone at the end are cut back and lengthened rather than left short.
Eave sheathing and soffit boards are replaced where the water reached them, and the ventilation openings that were there before are kept, because a closed eave dries slowly.
Drip edge and flashing are set so run-off leaves the roof into the gutter, and the gutter is re-hung to fall toward its outlets.
New wood is set in and the run closed, and photographs of each length, with the moisture readings taken on the day, go into the file.
A fascia repair that leaves the gutter as it was is a repainted problem. The wood at a roof edge only stays sound while the water that lands above it keeps moving past it.
Where fascia and eaves fail
Strip centers and pads
Wood fascia and mansard framing run the whole frontage, and a single blocked scupper or downspout wets a length of it above the shopfronts.
Restaurant canopies and trim
Canopy beams and wood trim sit under the roof edge and over the entrance, so the decay shows up where customers walk in.
Apartment and condominium blocks
Long eave runs over walkways and parking take the run-off from a large roof area through a small number of downspouts.
Older houses and rentals
Painted fascia on pre-1978 housing has to come off under lead-safe work practices, which changes how the run is set up rather than what is replaced.
Buildings under mature trees
Gutters fill with leaf litter faster than they are cleared, and the fascia below them stays wet through the rain months.
Ranch and packing buildings
Long open eaves on sheds and packing buildings carry no gutter at all, so the run-off lands at the base of the wall instead.
Questions about fascia and eave repair
Because the water problem is at the edge, not on the field. The Wood Handbook names roof edges and roof-to-wall junctions as critical points and recommends an overhang with gutters and downspouts kept free of debris. A roof membrane can be in good order while the gutter above a fascia run has been overflowing for seasons.
Only what has gone, cut back to sound wood and scarfed to the length that stays. The pest regulations set the same test for a fungus-damaged member: one weakened to the point where it no longer serves its intended purpose comes out, while one with only surface fungus damage may be treated or left.
Along the run being repaired, yes: the fascia is behind it and carries it. It goes back on brackets set to fall toward the outlets, because the condition that rotted the wood was water standing in or behind the gutter rather than leaving it.
Housing built before 1978 may carry lead-based paint, so removal of painted fascia, soffit or trim follows the lead-safe work practices in the EPA's Renovation, Repair and Painting rules. It changes the set-up and the clean-down, not the carpentry underneath.
The dry half of the year. Open sheathing and bare rafter tails should not meet a storm, and the Valley's rain normals sit in November to March. In midsummer the work starts early in the day.
Fascia and eave repair by city
This work is requested through the dry rot repair page for your city, where the local stock and the permit route are covered.
Related dry rot services
