Tamko Underlayment & Deck Repair Nationwide

Tamko Underlayment & Deck Repair: The Los Angeles Owner’s Guide

We stock and install Tamko-compatible underlayment and deck repair materials for most residential roofing systems in Los Angeles, with typical installed repair costs running $450 – $1,200 depending on deck exposure and square footage. Most Tamko underlayment and deck repairs we handle in Los Angeles are completed same-day when the damage is localized. Homeowners usually discover the problem after a Santa Ana wind event or the first hard rain of fall – water stains on the ceiling, shingles lifting at the edges, or a soft spot near valleys or penetrations where the underlayment has degraded and the deck beneath has started to rot.

Call (325) 246-5075

Which Tamko Models This Applies To

Tamko’s underlayment systems pair with their Heritage, Heritage Vintage, Heritage Woodgate, and Titan XT shingle lines – the synthetic underlayment is branded as Tamko TW Metal and Tile Underlayment on older jobs, or Tamko Titanium UDL and Titanium PSU30 on systems installed after 2015. The critical compatibility gotcha in Los Angeles: Tamko’s Titanium line is rated for direct-to-deck application on slopes 2:12 and steeper, but many Valley and Westside installers from the mid-2000s used standard felt underlayment on low-slope transitions where Titanium PSU30 should have been specified. That mismatch is why we see premature failure.

To identify what’s on your roof, check the printed roll label visible at the rake edge or peel a lifted shingle – Tamko underlayment carries a white printed logo and lot number. If the label’s gone, measure thickness: Titanium UDL is 6.5 mils, PSU30 is 30 mils and feels almost like a thin rubber mat. We carry both OEM Tamko underlayment and Grace Ice & Water Shield as a quality aftermarket alternative for high-exposure areas – Grace costs more per square but outperforms in the canyon wind zones above Hollywood and the Hollywood Hills where driven rain is the real killer.

Crestview Roofing is an independent service provider, not affiliated with Tamko. We source Tamko materials through authorized distributors and match them to your existing system.

Signs Your Tamko Underlayment & Deck Repair Is Failing

• Ceiling stains that appear or spread after rain, especially in valleys or near chimneys. This means water is getting past the shingles and the underlayment has torn, shrunk, or lost its seal – common in Los Angeles where thermal cycling from 50°F winter mornings to 90°F afternoons fatigues the membrane faster than in milder climates.
• Shingle edges curling or lifting, particularly on south-facing slopes. The underlayment beneath has likely degraded and is no longer providing a flat bonding surface; the shingles are essentially floating, and wind can work them loose.
• A soft or spongy feel when walking the roof near penetrations. This is deck rot – the OSB or plywood beneath the underlayment has absorbed moisture because the underlayment failed at a fastener line or seam. In Los Angeles, this happens fast when attic ventilation is poor and summer heat accelerates moisture trapping.
• Granule loss concentrated in strips or patches. Often misread as shingle failure, this pattern frequently tracks to underlayment wrinkling or buckling that creates a void; the shingle flexes, granules detach. We’ve traced this on dozens of San Fernando Valley homes where installers rushed the underlayment lay-down.
• Visible underlayment exposed at rake or eave edges. Means the starter course or drip edge has failed, but it also tells us the underlayment itself may be UV-degraded – Tamko’s synthetic lines handle 60 days of sun exposure max, and some L.A. jobs sit longer than that between trades.

Replacement Cost & What’s Included

Most standard Tamko underlayment and deck repairs in Los Angeles run $450 – $750 for localized underlayment replacement (up to two squares), and $850 – $1,200 when deck repair is needed (cutting out rotted OSB or plywood, replacing with CDX or OSB rated for roof application, then new underlayment and shingle replacement). The range depends on: deck material thickness (5/8″ costs more than 1/2″), slope difficulty (two-story or steep pitches add labor), and whether we’re matching existing Tamko shingles or doing a blend patch.

Every job includes: written line-item pricing before work starts, before-and-after photo documentation sent to your phone, and our 365-Day Done Right Promise – if the repair fails within a year, we come back and fix it free, including a free second visit. No change orders, no surprise charges. Every promise in writing – that’s just how we do it.

DIY or Call Us?

Here’s what you can safely check from inside: look at your attic during daylight – pinholes of light through the roof deck mean underlayment gaps. Check for dark staining on rafters or insulation. That’s information, not repair work.

Actually replacing underlayment and deck material means removing shingles, working on a sloped surface at height, and cutting structural decking. The fall risk is real, and deck replacement requires knowing load-bearing patterns and fastener schedules. In Los Angeles, permit requirements kick in for deck repairs exceeding 100 square feet or involving structural members – we pull those permits and schedule inspections as part of the job. For anything beyond a visual check, call us at (325) 246-5075 and we’ll give you a written price before any work starts.

FAQs

How long does Tamko underlayment last in Los Angeles? Properly installed Tamko Titanium UDL or PSU30 should last 20 – 30 years, but we’ve seen failures at 8 – 12 years in coastal zones like Venice and Santa Monica where salt air accelerates degradation, and in inland valleys where attic heat exceeds 150°F and cooks the underside. Call (325) 246-5075 for an exact quote – estimates are free.

Can the underlayment be repaired instead of replaced? Small tears can be patched with compatible peel-and-stick membrane, but only if the deck beneath is dry and the surrounding underlayment is still flexible. In most Los Angeles cases we see, by the time symptoms show indoors, the damage has spread beyond a reliable patch zone. Call (325) 246-5075 for an exact quote – estimates are free.

How long does the repair take? Most localized underlayment and deck repairs are completed in 4 – 6 hours. Full slope replacement runs 1 – 2 days. We give you a live trackable arrival time and photo updates throughout. Call (325) 246-5075 for an exact quote – estimates are free.

Do you stock Tamko underlayment on your trucks? We carry Tamko Titanium UDL, PSU30, and Grace Ice & Water Shield on every Los Angeles service vehicle, plus CDX and OSB decking in standard thicknesses. For specialty matches, we pull from our distributor same-morning. Call (325) 246-5075 for an exact quote – estimates are free.

Written by Dylan Pace, Owner, Crestview Roofing at Crestview Roofing, serving Los Angeles and nearby areas.