Learning Center · Roof Edge
Soffit and Fascia: What They Do, Why They Rot, and How They Are Repaired
The fascia is the board at the edge of the roof that carries the gutter. The soffit is the underside of the overhang, where the attic breathes in. Both sit downhill of every drainage mistake above them, and both are usually repaired at the same time as the roof edge.
Updated October 12, 2026
Read This First
The short version
- Fascia is the vertical board at the roof edge; soffit is the horizontal underside of the overhang.
- Fascia rots from the top down when water gets behind the drip edge or the gutter, and a sagging gutter is usually rotten fascia.
- Soffit vents are the intake half of attic ventilation, and the code sizes the whole system at 1 square foot of vent per 150 square feet of attic.
- The repair replaces the soft wood, keeps or adds the vents, and is best done when the drip edge and gutter are already off.
To have your roof edge looked at, start with Get Help or call or text 512-575-5052.
Short version: 2 min. Full page: 6 min. Want the detail? Each section below opens with a tap, or switch to Full at the top to open them all.
Direct Answer
What are soffit and fascia?
Fascia closes off the rafter ends and holds the gutter; soffit closes the overhang and holds the intake vents.
Two boards, two jobs
They are the finished edge of the roof. The fascia is the vertical board nailed to the ends of the rafters along the eave and the rake. The drip edge laps over its top and the gutter hangs on its face. The soffit is the horizontal panel under the overhang, running from the fascia back to the wall. On most Texas homes both are wood or a wood composite, sometimes wrapped in aluminum, and on newer homes the soffit may be fiber cement or vinyl. Our roof edges and drainage guide puts both in the full path water takes off a roof.
Failure
Why fascia rots and where soffit fails
Fascia gets water from a bad drip edge or spilling gutter; soffit gets it from the attic, the overhang or animals.
Fascia rots from the top down
The top edge is the weak point. Water that gets behind the drip edge, or spills over a clogged or badly pitched gutter, soaks into the top of the fascia. The paint blisters first, the wood softens, and eventually the gutter hangers have nothing to grip. That is why a sagging or pulled away gutter is usually a fascia problem, not a gutter problem, and why fascia is checked by pressing it with a tool, because paint hides soft wood well.
Soffit fails from three directions
Soffit gets wet from above, behind and below. Water running back along the underside of the overhang in a hard rain, moisture from an attic that cannot breathe, and squirrels or birds that found a way in at a vent all show up as stained, sagging or open soffit panels. A soffit that is stained near the eave is a reason to look at the drip edge and gutter above it.
Texas sun does the rest
Sun opens the joints. South and west fascia boards take the afternoon sun, the paint chalks and the caulk at the joints opens, and every open joint is a way in for the next storm. Our painting guides cover how long exterior paint lasts in Texas and why those walls go first.
Building Code
The soffit is where the attic breathes in
IRC R806 requires attic ventilation, sizes it at 1 to 150, and keeps a 1 inch air space at the eave.
What the code requires
Attic air comes in low and leaves high. IRC R806.1 requires cross ventilation of enclosed attics through openings protected against rain, with screened openings between 1/16 and 1/4 inch. R806.2 sets the minimum net open vent area at 1/150 of the attic floor, with a 1/300 exception when 40 to 50 percent of the vent area is high on the roof and the rest is in the bottom third of the attic. R806.3 says insulation may not block the eave vents and requires at least a 1 inch space between the insulation and the roof deck at the vent.
Why a soffit repair can wreck the ventilation
The intake is easy to lose. A solid replacement panel over a vented one, or a new soffit with fewer or smaller vents, starves the attic, and the ridge vent above it then pulls air from wherever it can, including the house. A soffit repair should keep at least the vent area that was there, and a soffit that never had vents is the right place to add them. The sizing math and the kinds of vents are in our attic ventilation guide.
Method
How soffit and fascia are repaired
Soft wood is cut back to sound wood, new boards primed on all sides, vents kept, drip edge and gutter back on last.
Fascia
The gutter and drip edge come off first. The soft board is cut back to sound wood or replaced full length, the rafter tails behind it are checked and sistered if their ends are rotten, and the new board goes up primed on every face and edge. Then the drip edge goes over the top of the fascia and the gutter hangs on the face. Fascia replaced without pulling the gutter is a board with its top edge still exposed.
Soffit
Soffit is replaced panel by panel. The stained or sagging panel comes out, the lookouts and the wall ledger it hangs from are checked, and a new panel goes in with the same or better vent area. Where the attic insulation has slumped into the eave, a baffle is set so the vent stays open. Our siding service covers the soffit, fascia and trim package with the siding it meets.
Why a re-roof is the best time
The edge is already open. On a roof replacement the drip edge comes off and the gutter is often re-hung, so fascia repair at that moment costs the labor of the board instead of the labor of taking everything down twice. Ask for fascia condition in the roof estimate, by section, with photos. Where the fascia rot came from a roof edge detail, the rafter and deck repair guide covers what is behind the board.
Inspection
What to look for from the ground
Peeling paint on the top edge, a gutter pulling away, stained or open soffit, and animals at the eave.
A five minute walk
Walk the house after a rain. Look for paint blistering along the top of the fascia under the gutter, a gutter that has pulled away or sags between hangers, water stains on the soffit, panels that have dropped or opened at the wall, and any gap at a vent where something could get in. Any of those is a reason to have the edge pressed and photographed.
Common Questions
Questions homeowners ask
What is the difference between soffit and fascia?
Fascia is the vertical board at the edge of the roof, nailed to the rafter ends, that the gutter hangs on. Soffit is the horizontal panel under the overhang between the fascia and the wall, where the attic intake vents are.
Why is my fascia rotting?
Water is getting to its top edge, usually from behind the drip edge or from a gutter that spills over or sits wrong. Paint hides the rot until the gutter starts to pull away.
Do soffit vents matter?
Yes. They are the intake half of attic ventilation. IRC R806 sizes the whole system at 1 square foot of net open vent area for every 150 square feet of attic, and a ridge vent without soffit intake has nowhere to pull air from except the house.
Can fascia be replaced without replacing the roof?
Yes, but the gutter and the drip edge have to come off to do it right, which is why a re-roof is the cheapest moment to do it.
Who repairs soffit and fascia?
Roofing and siding contractors do. The Roof Shepherd handles soffit, fascia and trim with its siding work and during roof replacements, based in Round Rock and working anywhere in Texas.
Keep Learning