Metal roofing
Architectural shingles
Tile roofing
GAF
Owens Corning
Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roof Repair Across Tarzana
Roof repair in Tarzana usually runs between $350 and $1,800 depending on what failed, but the real question on this side of the 101 is what you’re actually getting into once we’re on the ladder. Tarzana’s housing stock is a specific animal: sprawling ranches from the Eisenhower and Kennedy years, many still wearing their original skip sheathing under decades-old shake or tired composition shingle. That changes the math on what looks like a small patch job. We’re Mercer Roofing Co Woodland Hills, and Tarzana is a core part of our service area. Call (341) 217-2677 and a live person answers, day or night, to schedule a free estimate.
Why Mercer Roofing Co Woodland Hills Is Tarzana’s Preferred Roof Repair Company
We’ve worked on enough Vanalden Avenue ranches and Ventura Boulevard custom estates to know that no two Tarzana roofs fail the same way. The 1962 ranch with three additions has a completely different leak profile than the 1998 tile roof south of the Boulevard. Our Roof Repair crews arrive in marked uniforms, photo ID badges at the door, and you’ll have already received the technician’s name and photo before we knock. That’s the Threshold Verified standard, and it’s not negotiable at any independently owned location, including ours.
We put every price in writing before a single nail is driven. No surprises on the invoice, ever. Every repair carries the 365-Day Done Right Promise: if it’s not right within a year, we make it right, free second visit included. Grant Whitlock leads our crews, and he holds each technician to the same standard he’d want on his own roof in Tarzana.
Styles & brands we work with
Shingle Roof Repair in Tarzana
Shingle roof repair in Tarzana is the most common call we get, and it’s almost never just about the shingle you can see from the ground. On a 1960s ranch, the shingle that lifted in the last Santa Ana wind event is usually the symptom. The cause is often failed nailing on old starter strip, or underlayment that’s been baking in Tarzana’s UV for forty years and gives way under the first real rain. A straightforward shingle replacement on a reachable section of a single-story Tarzana home typically runs $350 to $800.
Replacing Brittle, Sun-Damaged Shingles
Tarzana’s summer sun breaks down asphalt shingles fast. The granules loosen, the mat dries out, and the shingle cracks along the nailing line. On low-pitch ranch sections, we replace individual shingles, check the nailing pattern underneath, and often find the originals were hand-nailed with too few fasteners for modern wind codes. We correct that as we go.
Architectural Shingle Section Repairs
When part of a roof was reroofed in architectural shingles but the rest wasn’t, the transition line is a weak point. We pull back the boundary course, inspect the underlayment, and tie new GAF or CertainTeed architectural shingles into the existing field so the repair doesn’t telegraph through after the next storm.
Storm Damage Roof Repair in Tarzana
Storm damage roof repair in Tarzana is a fall tradition, unfortunately. The Santa Ana winds don’t just blow leaves around. They get under ridge vents, tear starter strip loose, and peel back loose architectural shingles on the windward slope of low-pitch ranch sections. Repairing wind-lifted shingles and resecuring ridge vents on a typical Tarzana home runs $400 to $1,200, depending on how much of the ridge line is involved.
Wind-Lifted Ridge Vents and Starter Strip
After a wind event, homeowners on the flat stretches of Tarzana often notice a new drip near the ridge. The cause is usually a lifted ridge vent or compromised starter strip at the eave, where the original nailing wasn’t upgraded when asphalt replaced the old shake. We resecure the ridge vent with proper fasteners, re-nail or replace starter strip, and check the entire windward slope for hidden lift.
Debris Impact and Drainage After the Winds
Those same winds carry branches from the hillsides down onto roofs. A branch impact can crack a shingle or dent flashing in a spot you’d never see from the ground. We walk the whole roof after a storm call, not just the area near the visible damage. Often the second issue is a valley or gutter packed with debris that would have backed water up under the eaves during the first winter storm.
Trusted Brands We Service in Tarzana
We install and repair shingles from GAF, CertainTeed, and Tamko, among others. That matters in Tarzana because matching the existing field matters. Whether your 1970s ranch still wears the original GAF Timberline or a remodel brought in CertainTeed Landmark, we stock or order the right match instead of slapping on whatever’s on the truck. For Tarzana homeowners, that means the repaired section doesn’t announce itself as a patch from the street.
See the difference
Before
After
Before
After
Before
AfterCommon Roof Repair Problems We See in Tarzana Homes
- Leaks at addition transition lines. When a 1970s family room was added to a 1955 ranch, the valley where the two rooflines meet became a leak waiting to happen. We regularly find flashing that was never properly integrated with the original decking and underlayment, so the leak isn’t where the water shows up on the ceiling. It’s usually several feet upslope.
- UV-crazed sealant around skylights and penetrations. South of Ventura Boulevard, the custom homes with architectural glass skylights suffer a specific failure mode. The sealant around the skylight curb bakes in Tarzana’s sun, cracks, and then leaks every winter until the curb and flashing are redone properly around each penetration.
- Skip sheathing discovered during repairs. Many original Tarzana ranches never had solid sheathing under the shingles. They have skip sheathing, those spaced boards under the old wood shake. When a repair escalates to any real scope of work, code requires adding plywood or radiant barrier sheathing. That’s a legitimate cost and schedule item, not a contractor upsell. And it doesn’t hit the same way on newer Woodland Hills homes built after 1980.
- Santa Ana wind damage on low-pitch sections. The windward slope of a low-pitch ranch section takes the brunt of every wind event. Loose starter strip, lifted ridge vents, and shingles that never had enough nails from the last reroof create a cycle of wind damage and water intrusion that repeats every fall.
Pricing for Roof Repair in Tarzana, CA
Here’s what to plan for. Minor shingle replacement on a single-story Tarzana ranch: $350 to $800. Flashing repair at a valley or chimney: $450 to $1,100. Flat roof patch on a low-pitch section: $600 to $1,500. Full vent boot replacement: $250 to $500. If we find skip sheathing and rotted decking underneath, the repair scope grows, and so does the honest cost. You’ll see that number in writing before we start, not after we open the roof. Every estimate is free. Call (341) 217-2677 and we’ll schedule a walkthrough.
We Also Serve Cities Near Tarzana
Mercer Roofing Co Woodland Hills serves the whole west Valley. Our Roof Repair in Tarzana crews are in Encino, Reseda, Woodland Hills, and Winnetka on a regular schedule, and we know the housing stock in each neighborhood. If you’re a few blocks over the line, we’re still your local crew. Same written pricing, same badge at the door.
Serving Tarzana, CA - Our Local Coverage Area
We’re based in the Tarzana 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 Repair in Tarzana
It’s the skip sheathing. Tarzana ranches from the 1960s often have spaced boards under the old wood shake, not solid plywood. Once we open the roof and expose that condition, current building code requires installing solid sheathing before new roofing goes down. That turns a patch into a structural correction. We won’t hide that from you. We’ll show you photos from the roof and give you a written explanation of what code requires before you spend another dollar.
Yes. We don’t require a full reroof if the pitched tile section is sound. Flat sections on Tarzana ranches are often tar-and-gravel or modified bitumen and fail on their own schedule. We’ll isolate the leak to the flat section, patch or replace that area, and tie the flashing into the tile transition properly so water moves off the roof instead of pooling at the seam. Call (341) 217-2677 for a free estimate on just the flat section.
We inspect the entire windward slope, not just the shingles that lifted. Then we resecure the loose architectural shingles, re-nail the starter strip, and check the ridge vent for lifted fasteners. On older Tarzana roofs where the nailing pattern never met wind code, we correct that on the repaired section and document it for you. You get a written repair with a 365-day guarantee.
The right way is to remove the old sealant, inspect the curb, replace any rotted wood, install new metal flashing with proper step and counter-flashing, and reseal with a UV-stable product. What we see on custom homes in Tarzana is the opposite: someone smeared a fresh bead of caulk over the old cracked sealant and called it fixed. It leaks again by February. We rebuild the flashing so it doesn’t depend on caulk at all.
Yes, and it trips up a lot of homeowners. A roofing square is 100 square feet. When a roofer says “18 squares,” that’s 1,800 square feet of roof surface, not the footprint of the house. Your 2,200-square-foot single-story Tarzana ranch with a low pitch might be around 23 to 26 squares. We price by the actual roof area and show you the square count on the written quote, so you can verify the math yourself.
If your Tarzana roof is leaking, lifting, or just aging past the point of patchwork, call (341) 217-2677. We’ll schedule a free estimate, send you the technician’s name and photo before we arrive, and put every price and guarantee in writing before any work begins.
Written by Grant Whitlock, Owner at Mercer Roofing Co Woodland Hills, serving Tarzana and the surrounding west Valley.