Structural Roof Repair in Austin · Sister Rafters, Decking, Chimney Crowns
The Direct Answer
Most roof failures are structural, not surface. Soft decking, sagging ridges, separated rafters, cracked chimney crowns, and decayed roof-to-wall flashing are the items that turn a clean reroof into a leak two seasons later. Austin Area Roofers diagnoses every one of them on inspection and rebuilds them to the International Residential Code structural spec before any new shingle goes down. Twenty-seven years in Central Texas. Sister rafters set with Simpson Strong-Tie connector plates, OSB decking replaced at 7/16 inch with ring-shank nails on a six-and-four pattern, chimney crowns rebuilt before flashing returns.
The premise nobody explains to homeowners
Most roof failures are not surface failures. The shingle stops a small fraction of the work · the rest is decking integrity, rafter span, flashing geometry, and the structural soundness of every penetration. Reroofs that bury a structural failure under new shingles fail again inside three seasons. Reroofs that diagnose and rebuild the structural failure first hold for the full warranty term. The diagnostic discipline is what separates a clean install from a return service call.
The six structural failures we find most often
Item 01
Soft and rotted decking
Original sheathing fails under prolonged moisture from a failed underlayment, missing ice and water shield, or a slow leak around a penetration. Soft decking returns no nail-pull tension and accepts a screwdriver tip without resistance. We test every roof for soft decking on inspection and again before new underlayment goes down.
Item 02
Ridge sag and rafter separation
Ridge boards that have separated from rafters or rafters that have rotated under load show up as a sag in the ridge line, a high spot at a hip, or a sponge feel walking the peak. Visible deflection over a fifteen-foot run is structural. We document the deflection, sister the affected rafters, and tie them back to the ridge before new decking goes on.
Item 03
Cracked chimney crowns
The masonry slab on top of a brick chimney is the crown. Hairline cracks across the wash let water into the brick course below, freeze-thaw cycles widen the crack, and the crown eventually shells off in pieces. A chimney with a cracked crown loses flashing integrity even with new step flashing installed. Crowns get rebuilt before flashing returns.
Item 04
Roof-to-wall flashing decay
Step flashing and counter-flashing fail at the wall-to-roof intersection where two planes meet under a sidewall or dormer. Rusted-through metal, failed sealant, and shingles that have crept past the flashing edge are the visible signs. The repair is a full flashing rebuild with new step and counter at every overlap, not a sealant patch.
Item 05
Pipe boot collar failure
The rubber gasket around every plumbing vent fails first under UV. Cracked gaskets, split collars, and lifted boot bases are the most common single cause of ceiling stains around bathrooms and kitchens. We replace every pipe boot at reroof, document any visible interior staining, and check the framing under each vent for moisture history.
Item 06
Attic framing damage from prior leaks
Old leaks leave a record in the attic · stained sheathing, mold colonies on rafter faces, deflected joists, and insulation displacement. Photos of the attic from inside, taken before tear-off, document the history. Where rafters show damage, we sister a new member alongside the original and tie it to the ridge and the top plate per IRC R802.
The repair specs we install to
Every structural repair on an AAR roof gets executed to a written spec. The spec ties to the International Residential Code, the manufacturer warranty registration for the new shingle, and the Texas-specific wind-uplift requirements for our zone. No vague headings. No discretionary substitutions on the job.
Sister rafters · IRC R802
New rafter sistered the full length of the damaged member, fastened with structural screws on a staggered pattern, tied at both the ridge and the top plate with Simpson Strong-Tie connector plates. Connector plate spec selected to match the original rafter dimension and span. No nail-only sistering. No partial-length sisters.
OSB decking · 7/16 inch ring-shank pattern
New 7/16 inch OSB on every replaced sheathing course. Ring-shank nails set at six-inch field spacing and four-inch edge spacing, per manufacturer specification for the shingle warranty we are registering. Decking H-clips installed on every unsupported edge to prevent flutter and seam telegraph.
Chimney crown rebuild
Cracked crown removed in full. New crown poured with reinforcing mesh, sloped two-degree wash toward the perimeter, drip-edge overhang on every side. Cured 48 hours minimum before flashing returns. Two-part urethane bead between the crown and the top brick course.
Step + counter-flashing rebuild
Hand-folded copper or 24-gauge galvanized step flashing at every shingle course. Counter-flashing inset into a fresh mortar joint, sealed with two-part urethane. No surface-mounted flashing strips. No reused step. No sealant-only patches.
Pipe boot replacement · two-part urethane
Original boot removed in full, shingle cut back to expose the deck flange, new lead-base boot set into the new shingle field with proper weave. Two-part urethane bead at the collar-to-pipe transition. Manufacturer warranty registers on this detail.
Our process when we walk a structural repair with you
Step 01
Free structural inspection
We are on the roof within 48 hours of your call. Every slope walked, every penetration checked, attic inspected from inside, every rafter felt for deflection. About thirty percent of structural concerns we are called for turn out to be cosmetic. We tell you so.
Step 02
Photo documentation
Photo report delivered same day. Every soft decking sample, every rafter deflection, every chimney crown crack, every roof-to-wall flashing failure documented with location and measurement. Attic photos included. The packet is yours regardless of whether you hire us.
Step 03
Engineered repair scope
We write the scope to IRC R802 structural code, manufacturer warranty spec, and Texas-specific wind-uplift requirements. Line-itemed by repair, with the material spec, the labor spec, and the warranty terms. No vague headings.
Step 04
Same-crew execution
Benny and the family-built crew walk every structural repair from tear-off through inspection. No subcontracted framing crew. No day-labour for the heavy work. The same supervisor signs off the rafter sistering as signs off the shingle install.
Featured repairs · documented across Central Texas
A documented sample of recent structural repairs from three Central Texas reroofs. The tear-offs revealed soft decking, sister-rafter needs, cracked chimney crowns, decayed roof-to-wall flashing that had been hidden under sealant patches, and pipe boots that returned no UV-tension. Every item documented, every repair executed to spec, every photo pulled directly from CompanyCam. Client names redacted to courtesy form, street names without numbers, per our documentation privacy standard.
Service area
Austin Area Roofers serves Round Rock, Cedar Park, Tarrytown, Westlake Hills, Bee Cave, plus every neighborhood in between across the Austin metro.
Frequently asked questions
Do you handle structural roof repair as a stand-alone job?
Yes. A structural repair scope · sister rafters, decking replacement, chimney crown rebuild, flashing rebuild · gets executed as its own job when the rest of the roof is in good shape. We have done structural-only repairs on five-year-old roofs where a small section of decking failed under a hidden leak.
What is sister rafter framing and when does my roof need it?
A sister rafter is a new rafter set alongside an existing one and tied to the ridge and top plate, used when the original has cracked, deflected, or rotted. Common indicators are a visible ridge sag, a soft spot underfoot on the roof, or stained insulation directly under a rafter in the attic. The repair restores the structural span without removing the original member.
Why do chimney crowns crack and what does the repair involve?
Chimney crowns crack from freeze-thaw cycling on water trapped in hairline shrinkage cracks. Once a crack is open, every freeze widens it. The repair is a full crown demolition, a new crown poured with reinforcing mesh and a two-degree slope away from the chimney, and 48-hour cure before flashing returns. Surface-sealant patches on a cracked crown buy three to five years before the same crack returns.
How much does structural roof repair cost in Austin?
A targeted structural repair on a single rafter, single course of decking, or single chimney crown typically runs in the low thousands. A multi-rafter sister job with associated decking replacement runs higher. Every job is scoped after a free inspection. The number on the quote ties to the documented repair, line item by line item.
Can structural roof repair be done without replacing the whole roof?
Yes. The repair is targeted to the failed members. We open the shingle field over the affected section, execute the structural work, and reinstall a matching shingle weave. Where the existing shingle is more than ten years old or no longer in production, we discuss a partial reshingle or full reroof so the warranty terms remain clean.
Do you photograph the work and provide a copy of the file?
Yes. Every structural repair is photographed before, during, and after. The file lives in CompanyCam, you get a copy as a documentation packet, and the AAR office keeps a copy for the warranty period. The same documentation standard we use on insurance claims.
Free structural inspection
The deep work other crews paper over handled to IRC R802 spec by the family-built crew that has rebuilt Austin roofs for twenty-seven years.
Free instant quote online, or call the office and ask for Dennis or one of the highly trained sales specialists. They walk you through every line item before any work starts. That is confidence in our work product.