Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Before
After
Before
After
Before
AfterMr-Glass Roofing: The Sunnyvale Owner’s Guide
Mr-Glass roofing systems installed in Sunnyvale typically run $8,000-$20,000 for full replacement depending on membrane type and roof pitch, with repair work on failed components ranging $400-$1,800. We stock Mr-Glass-compatible membrane rolls, flashing kits, and seam tape on our Sunnyvale trucks, and most part replacements are completed in a single visit. Most Sunnyvale owners discover a Mr-Glass part has failed when they spot water staining on a ceiling panel after our first fall rains, or when a routine HVAC service call reveals deteriorated membrane at the penetration points where ducting exits the roof plane.
Which Mr-Glass Models This Applies To
Mr-Glass has produced three primary roofing series relevant to the Sunnyvale market: the residential TPO membrane line (2008-2019), the commercial-grade EPDM Black-Glass series, and the newer hybrid PVC systems introduced around 2020. The critical compatibility gotcha is seam tape width: pre-2015 TPO installations used 3-inch tape, while post-2015 shifted to 4-inch, and using the wrong tape creates a lap seam that will delaminate within two Sunnyvale summers. We identify the correct part by reading the embossed series code on the membrane edge, visible at any roof penetration or termination bar, then matching mil thickness (typically 45, 60, or 80 mil for residential work). OEM Mr-Glass membrane carries a printed lot number; quality aftermarket equivalents from Johns Manville or Carlisle meet the same ASTM D6878 spec and often arrive faster from San Jose distribution. We quote both options with the spec sheet attached so the owner chooses based on lead time and warranty term, not guesswork.
Signs Your Mr-Glass Roofing Is Failing
- Water spots on ceiling drywall below roof penetrations. Mr-Glass flashing boots around vent pipes and HVAC curbs are the first failure point; the EPDM rubber gasket hardens in Sunnyvale’s UV exposure and loses its mechanical seal against the pipe wall.
- Bubbling or tenting of membrane surface. Trapped moisture vapor pushes the TPO layer upward; this indicates a seam failure or inadequate fastening at the insulation board layer beneath.
- Cracking at membrane seams, especially on south-facing roof slopes. Thermal cycling in Sunnyvale’s 40-degree winter-to-95-degree summer range fatigues the adhesive; the seam opens gradually, often invisible from ground level until water enters.
- Granule accumulation in gutters from modified bitumen cap sheets. On older Mr-Glass hybrid systems, the mineral surfacing sheds as the asphalt core oxidizes; this is end-of-life signaling, not a repairable part failure.
- Musty odor in attic space after rain. Slow leaks through compromised membrane travel along the roof deck before dripping; by the time staining appears below, the OSB or plywood substrate has absorbed significant moisture.
Before
AfterReplacement Cost & What’s Included
| Service | Sunnyvale Price Range | What’s Included |
|---|---|---|
| Mr-Glass membrane patch (up to 10 sq ft) | $400-$850 | Cutback, substrate inspection, new membrane section, seam welding, 1-year workmanship warranty |
| Flashing boot replacement (per penetration) | $180-$340 | Removal of degraded boot, pipe surface prep, new EPDM or silicone boot, sealant, photo documentation |
| Seam repair (linear foot) | $45-$85 | Grind-back, primer, new seam tape, hot-air weld, probe test |
| Partial membrane replacement (100-300 sq ft) | $1,200-$2,800 | Removal, insulation inspection, new membrane, full seam welding, 2-year workmanship warranty |
| Full Mr-Glass roof replacement | $8,000-$20,000 | Tear-off, deck inspection/repair, new insulation if needed, complete membrane system, 10-year manufacturer warranty, 5-year workmanship warranty |
What drives the range: roof pitch (steeper = more labor hours), deck condition once exposed, and whether the existing insulation meets current Title 24 energy code. Under Clause 1 of the Haven Standard, every quote is a flat written price with material costs, labor hours, and any subcontractor scope listed separately. No work proceeds on a change until the change order is signed. Our 365-Day Done Right Promise covers the workmanship; manufacturer defects are handled through the printed warranty terms.
DIY or Call Us?
A Sunnyvale owner can safely inspect from the attic: look for daylight through the roof deck, feel for damp insulation, photograph any staining for our review. What goes wrong with DIY membrane work is the welding. TPO and PVC seams require a hot-air welder set to precise temperature and speed parameters; too cool and the seam fails, too hot and you burn through the membrane. EPDM adhesive work demands solvent-based contact cement in ventilated conditions with proper PPE. Fall risk on any roof over 6:12 pitch is real, and Sunnyvale’s tile roofs are unforgiving. We’re background-checked, uniformed, and carry the hot-air equipment on the truck. Call (650) 405-3637 to schedule your free estimate; we’ll scope it, photograph what we find, and deliver a written price before any work starts.
FAQs
Properly installed TPO membrane in Sunnyvale’s UV and thermal-cycling environment typically delivers 15-22 years; EPDM runs 20-30 years but requires more frequent flashing maintenance. South-facing slopes degrade faster than north-facing by roughly 20%. Call (650) 405-3637 for an exact assessment of your roof’s condition - estimates are free.
Isolated membrane punctures and single failed flashing boots are repairable; widespread seam degradation or brittle membrane indicates replacement is the cost-effective path. We document the condition with photos and quote both options when both are viable. Call (650) 405-3637 for a line-item written estimate.
Most single-component replacements - a flashing boot, a membrane patch, a linear seam repair - are completed in 2-4 hours. Partial membrane replacement runs 1-2 days depending on roof area and weather hold. We stock common Mr-Glass-compatible parts on our Sunnyvale trucks, so scheduling is the typical delay, not parts procurement.
We stock TPO membrane in 45 and 60 mil, EPDM membrane, seam tape in both 3-inch and 4-inch widths, flashing boots in standard pipe diameters, and termination bars on every Sunnyvale truck. Specialty colors or 80-mil commercial membrane may require next-day pull from San Jose distribution; we confirm availability when we deliver the written quote.
Rowan Construction Group Sunnyvale is an independent service provider and is not affiliated with Mr-Glass. We also stock parts for and install systems from KraftMaid, Cambria, and Silestone where those product lines intersect with our trades.
Grant Rowan trained in construction technology at Santa Monica College, where coursework covered structural load calculations, blueprint reading, and site safety - fundamentals he still references when scoping a job today. For more than two decades he and his crew have worked across Sunnyvale, including extensive remodel and build-out work in the Lakewood Village neighborhood near Washington Park. “Measure it twice, write it down, then build it.”
Every visit includes a documented photo record as standard, not an upgrade. A live person answers calls 24/7. And under Clause 1 of the Haven Standard, the price is written before anyone starts.
Ready for your written estimate? Call (650) 405-3637 to schedule your free estimate. We’ll inspect the roof, photograph what we find, and deliver a flat written price with material costs and labor hours listed separately.
Written by Grant Rowan, Owner, Rowan Construction Group Sunnyvale at Rowan Construction Group Sunnyvale, serving Sunnyvale and nearby areas.