Tile roofing
Architectural shingles
GAF
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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Roof Replacement in Simi Valley: What Opening Up a 1960s Roof Actually Turns Up
If you own a home in Simi Valley built before 1980, especially in the flatlands east of Tapo Canyon Road, a roof replacement here rarely stops at shingles. What our crews find under the old wood shake or dried-out composition shingle is what changes the quote: decking nailed every 12 to 18 inches instead of the 6-inch pattern today’s wind-uplift code requires, rotten sheathing at chimneys and plumbing boots, and flashing that predates current seismic shear standards. So the honest answer for most Simi Valley homeowners is this: expect a permit-triggered reroof to include some decking re-nailing or full sheathing replacement before the new covering goes down. Call (350) 240-5534 and we’ll walk you through what that means for your exact roof, in writing, before any work starts.
Key Takeaways for Your Simi Valley Roof Replacement
- Most full Roof Replacement projects in Simi Valley run $14,000 to $38,000 depending on size, pitch, covering choice, and how much decking needs to be re-nailed or replaced once the old roof comes off.
- Original 1960s wood shake roofs east of Tapo Canyon Road almost always fail current wind-uplift inspection unless every sheet of decking is re-nailed to the trusses.
- Permits are pulled on every replacement in Simi Valley, and the inspection pass is part of the job, not an afterthought.
- Birchbark Roofing Ventura gives you a written price in dollars before work begins, never a verbal estimate that drifts.
Styles & brands we work with





Fast, Reliable Roof Replacement Across Simi Valley
Birchbark Roofing Ventura replaces roofs across Simi Valley, from the 1960s ranchers along Royal Avenue to the tile-roofed hillside subdivisions built in the 1980s and 1990s. We know these houses because we’ve opened them up. The post-war tract homes west of the 118 have low-pitched roofs and truss framing that makes tear-off straightforward, but the decking underneath often hasn’t been touched since the day it was installed. The steeper lots near Wood Ranch and Big Sky carry concrete tile that cracks under Santa Ana thermal movement, and when wind-driven rain gets through those cracks, it rots fascia and soffit before you ever see a ceiling stain. A live person answers our phone 24 hours a day, 7 days a week. When you call (350) 240-5534, you’ll talk to someone who can schedule your free roof assessment in Simi Valley, not a voicemail tree.
Why Birchbark Roofing Ventura Is Simi Valley’s Preferred Roof Replacement Company
Homeowners in Simi Valley call us because we put the protections in writing. You get a written price before any work starts. You get a 365-Day Done Right Promise stamped on every roof replacement we perform, covering the work if it isn’t right. And you get the Cedarwell Care Promise on every job: shoe covers at the door, drop cloths through the hallway, pet-safe product choices where there’s a choice, and a photo of the completed clean-up before our crew leaves. Erik Lindgren runs our crews under that standard, and every technician who walks onto your Simi Valley property is background-checked and uniformed, so you know exactly who is walking through your door and onto your roof.
We’re part of the Cedarwell family of independently owned roofing businesses, which has held its locations to the C.A.R.E. values since 2000: Clean up like it’s our own home. Ask before we move or touch anything. Respect the family’s time and quiet hours. Explain the price before the work. That’s how we treat a 1972 rancher off Royal Avenue the same way we’d treat a newer tile roof near Sinaloa Lake.
Roof Replacement Contractor in Simi Valley
A Roof Replacement Contractor in Simi Valley has to handle what a tear-off reveals. On the older flatland houses near the Tapo Canyon corridor, that often means decking nailed at 12-inch spacing, not the 6-inch pattern required for current wind-uplift and seismic shear compliance. On the tile roofs in the hills above the city, it means cracked tiles and underlayment that dried out years before the first leak showed on the ceiling. A full Roof Replacement in this market typically runs $14,000 to $38,000, with the biggest variable being the condition of the sheathing once the old roof comes off.
What the job involves here
We remove the existing roof covering down to the decking. In Simi Valley’s older tract homes, that step often doubles as an inspection: you see the nail spacing, you see the rot, you see exactly what code requires before the new roof goes on. Then we re-nail or replace sheathing to spec, install new underlayment, flashing, drip edge, and the covering you’ve chosen.
When a Simi Valley homeowner needs this
You need a replacement when the original wood shake is curling, splitting, or losing its weather-resistance; when composition shingles are lifting at the eaves from years of Santa Ana winds; or when concrete tile has cracked so widely that the underlayment below is exposed. A repair can buy a season. A replacement ends the cycle.
Asphalt Shingle Roof Replacement in Simi Valley
An Asphalt Shingle Roof Replacement in Simi Valley is the most common choice for the city’s low-pitched 1960s and 1970s ranch homes, and it makes sense on a couple of fronts. Modern architectural shingles from GAF, CertainTeed, or Owens Corning weigh less than concrete tile, so they don’t overload trusses that were designed for wood shake. And they install cleanly on the 4:12 and 5:12 pitches you see on most of the tract housing around the 118 corridor. A full asphalt shingle Roof Replacement in Simi Valley generally runs $14,000 to $28,000, with the final number set by square footage and how much decking needs work.
The decking underneath decides the price
On original 1960s shake roofs, the decking was installed long before modern nail schedules existed. We re-nail every sheet to the trusses at the spacing current code requires, replace any sheathing that’s delaminated or rotten, and only then lay the new underlayment and shingles. That’s not a surprise we spring on you mid-job; it’s an allowance we write into the contract so the price is in front of you before the first nail comes out.
Wind and fire considerations
Simi Valley sits in a high-wind corridor, and the Santa Anas test every seam on a roof. We install architectural shingles rated for 130 mph wind with the manufacturer’s required start-strip and valley flashing pattern, which matters for the permit inspection and for the years that follow. On the fire-resistance side, asphalt shingles give older wood shake homes a Class A rating without the structural weight of tile.
See the difference
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AfterTrusted Brands We Service in Simi Valley
Birchbark Roofing Ventura works with materials from GAF, CertainTeed, Tamko, and Boral, so you’re choosing the warranty and performance characteristics that fit your house, your budget, and your roof’s pitch. Low-pitched tract homes do well with CertainTeed or GAF architectural shingles. Hillside tile roofs in Simi Valley neighborhoods like Wood Ranch often match best with a Boral or Tamko concrete tile replacement. Because we stock components and order direct from these manufacturers for our Simi Valley jobs, we can often get materials to your property without the wait that some out-of-area contractors run into.
Common Roof Replacement Problems We See in Simi Valley Homes
- Decking that fails wind-uplift inspection. Original 1960s decking was often nailed every 12 to 18 inches. Current code requires 6-inch spacing. If the old roof comes off and the inspector looks at that decking, you’ll need every sheet re-nailed or replaced before the new covering goes on.
- Rotted sheathing at chimney and plumbing boots. Low-pitched roofs from the post-war boom collect water around penetrations once the original underlayment dries out. We find rotten decking there after tear-off, far more often than homeowners expect.
- Cracked concrete tile from thermal movement. Santa Ana events bake the tile, then the temperature drops at night. The tile expands and contracts until it cracks, and wind-driven rain enters through those cracks to rot fascia and soffit before the ceiling shows a stain.
- Original wood shake at the end of its life. In the older neighborhoods east of Tapo Canyon Road, the shake installed in the 1960s is past its service life. Fire-resistant requirements and structural weight limits mean homeowners usually replace it with lightweight concrete tile or asphalt shingles rather than shake.
Pricing for Roof Replacement in Simi Valley, CA
A full Roof Replacement in Simi Valley typically runs $14,000 to $38,000. Asphalt shingle replacements land in the $14,000 to $28,000 range for most single-family homes. Tile replacements on hillside lots run higher, generally $22,000 to $38,000, because the covering costs more and the tear-off is slower. The wild card in Simi Valley is the decking: on older flatland homes, re-nailing or replacing sheathing adds $1,500 to $4,000 depending on roof size. You’ll see your exact number in writing before we start, with allowances for any decking work written into the contract rather than added as a change order later. Call (350) 240-5534 for a free roof assessment and written quote.
We Also Serve Cities Near Simi Valley
If you live just outside Simi Valley, our crews cover Moorpark, Newbury Park, Fillmore, and Somis as well. Dispatch and scheduling are coordinated from the brand’s Los Angeles office, and crews serve Simi Valley locally. Learn more about our work across the region on our Roof Replacement service page or see what we do specifically in Simi Valley.
Serving Simi Valley, CA - Our Local Coverage Area
We’re based in the Simi Valley area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Roof Replacement in Simi Valley
Because Simi Valley’s pre-1980 tract homes were built before current wind-uplift and seismic shear nailing codes existed. The original decking was often nailed every 12 to 18 inches, and modern code requires 6-inch spacing. A permit-triggered reroof in those neighborhoods usually forces full re-nailing or sheathing replacement before the new roof can pass inspection, which is exactly why Birchbark writes a decking allowance into the contract up front so the price doesn’t move on you mid-job. Call (350) 240-5534 and we’ll explain what code requires on your specific roof.
Technically yes, but most Simi Valley homeowners don’t. Original 1960s shake roofs in the flatlands east of Tapo Canyon Road are past their service life, and fire-resistant requirements plus structural weight limits push most replacements toward lightweight concrete tile or architectural asphalt shingles. Both give you a Class A rating without the maintenance and weight of shake. If you want to explore your options, call (350) 240-5534 and we’ll bring samples and a written comparison.
Architectural asphalt shingles are usually the right answer for Simi Valley’s 4:12 and 5:12 pitched tract homes. They’re light enough for trusses designed for wood shake, they hold up to the Santa Ana wind loads when installed with the right nail schedule and flashing pattern, and they meet the fire-resistance requirements that apply in the foothill interface. We install GAF, CertainTeed, and Owens Corning shingles rated for 130 mph wind on these roofs.
We document it, price it in writing, and get your approval before we touch it. Cracked tile on hillside lots in places like Wood Ranch lets wind-driven rain reach the underlayment and the decking below, and the rot often shows up only after tear-off. The rot gets cut out, the sheathing is replaced to current nailing schedule, and the underlayment goes down new before the tile is reinstalled or replaced. You see that price before the work happens, not as a surprise invoice afterward.
Yes, and it’s not optional. The ridge vent and drip edge on a 50-year-old Simi Valley roof were installed for a different roof system, and the building code now requires specific ventilation ratios and drip edge profiles for the new covering to pass inspection and perform correctly. We replace both on every full Roof Replacement in Simi Valley, and the cost is part of your written quote, not an add-on later.
When you’re ready to get a real number for your Simi Valley roof replacement, call (350) 240-5534. A live person answers, and your estimate is free.
Written by Erik Lindgren, Owner at Birchbark Roofing Ventura, serving Simi Valley since 2000.