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 Redwood City Owner’s Guide
Mr-Glass roofing systems in Redwood City typically run $400-$1,800 for repair work and $8,000-$20,000 for full replacement, with most common part failures addressed same-day when we stock the component. We carry Mr-Glass-compatible membranes, flashing kits, and drainage hardware on our trucks throughout the Peninsula. Most Redwood City owners discover a problem after the first heavy winter rain, when a slow leak they’ve ignored for months finally shows as a ceiling stain or bubbling paint near a skylight frame.
Which Mr-Glass Models This Applies To
Mr-Glass has produced three distinct roofing product lines relevant to Peninsula homes: the Classic Series (2002-2012), ProLine (2012-2019), and current ProLine XT. The Classic Series used a 45-mil TPO membrane with mechanically attached seams; ProLine switched to 60-mil fully adhered with a different fastening pattern around curbs and penetrations. The XT introduced a reinforced edge detail that is not backward compatible.
To identify your system, check the specification label on the interior face of any skylight curb or roof access hatch. Classic Series labels are silver foil; ProLine and XT use white polyester with a QR code. The critical measurement is membrane thickness at the seam, not the field. We stock OEM Mr-Glass termination bars and preformed corner flashings for all three series, plus aftermarket membrane from Versico and Carlisle when the original spec is discontinued. For Classic Series jobs in Redwood City, we typically recommend OEM fasteners because the hole spacing differs by 3/16 inch from generic equivalents, enough to cause bridging in wind uplift zones.
Signs Your Mr-Glass Roofing Is Failing
- Water stains on ceiling drywall below skylights or curbs. The butyl tape seal between the Mr-Glass curb and the membrane degrades faster on south-facing slopes in Redwood City’s climate, where UV exposure runs 2,200 hours annually. The tape hardens and cracks, creating a capillary path that shows up as a circular stain during the first sustained rain.
- Bubbling or tenting of the membrane surface. This indicates trapped moisture or adhesive failure, common in Classic Series installations where the original water-based bonding adhesive was applied below 40 degrees. The bubble grows with thermal cycling and will eventually split at the seam.
- Granule accumulation in gutters from a “membrane” roof. If you see this, the Mr-Glass system was likely overlaid with a modified bitumen cap sheet during a previous repair, and that cap sheet is now shedding. The underlying Mr-Glass membrane may be intact or compromised; we verify with a core cut.
- Daylight visible through the roof from the attic. Check during full sun. Pinholes in ProLine XT membrane occur at fastener locations when the XT’s reinforced edge detail was installed with incompatible pressure plates. The hole is small but the water volume over a winter is not.
- Skylight glass fogging between panes. This is a sealed-unit failure, not a roof leak, but the Mr-Glass curb flashing must be removed to replace the glass. We address both while the curb is open; half the labor cost is access.
Before
AfterReplacement Cost & What’s Included
| Service | Redwood City Price Range | Typical Scope |
|---|---|---|
| Mr-Glass membrane patch (up to 25 sq ft) | $400-$800 | Cut, prep, weld patch, seal test |
| Skylight curb reflash (OEM kit) | $600-$1,200 | Remove, clean, new tape, reinstall, detail |
| Full Mr-Glass membrane replacement | $8,000-$20,000 | Tear-off, substrate inspection, new 60-mil, warranty |
| ProLine XT edge detail replacement (linear foot) | $18-$28 | Remove, realign, new termination bar, sealant |
What drives the range: substrate condition after tear-off, access complexity (steep pitches above 6:12 require staging), and whether the existing insulation meets current Title 24 requirements. We quote a flat written price before work starts, every time, under Clause 1 of the Haven Standard. The 365-Day Done Right Promise covers all Mr-Glass work. You’ll receive a documented photo record of substrate condition, the installed membrane weld tests, and the completed detail shots before we leave.
DIY or Call Us?
There’s a safe middle ground. An owner can check the specification label, photograph any stains for our review, and verify whether the attic insulation is wet to the touch. What you should not attempt: lifting membrane to trace a leak (the weld requires a hot-air gun and proper seam roller pressure), walking a wet or steep-slope Mr-Glass roof (the membrane surface is slick, and ProLine XT’s texture wears smooth after five years), or applying consumer-grade sealant at a curb. We’ve removed enough caulk jobs in Redwood City to know that silicone on TPO creates a bond-breaker layer that makes proper welding impossible later.
Mr-Glass membrane welding runs 600-800 degrees at the nozzle. The seam must be probed with a rounded tool to verify fusion. This is not a YouTube-and-weekend project. Call (650) 560-7228 and we’ll schedule a free estimate with a written price before any work starts.
FAQs
Properly installed Mr-Glass TPO membrane lasts 20-25 years on the Peninsula, though south-facing slopes with poor attic ventilation may see 15. Coastal salt exposure in Redwood City’s western hills accelerates fastener corrosion, which we address with stainless termination hardware. Call (650) 560-7228 for an exact assessment of your roof’s remaining service life; estimates are free.
Yes, if the membrane is less than 60% of its rated lifespan and the substrate is dry. We core-cut to verify. Patches are viable for isolated punctures or seam failures; widespread tenting or multiple leak points usually indicate replacement. We will show you the photo record and explain which category you’re in before quoting either path. Call (650) 560-7228 for a free written estimate.
Most curb reflash and patch work completes in four to six hours. Full membrane replacement on a typical Redwood City single-family home runs three to five days, including substrate drying time if we find wet insulation. We do not start until the written scope and price are signed. Call (650) 560-7228 to schedule.
We stock Mr-Glass-compatible termination bars, preformed pipe boots, curb flashing kits, and 60-mil TPO membrane in white and gray. OEM Mr-Glass branded components are available with one-day lead time from the San Jose distribution center. For same-day response in Redwood City, our aftermarket equivalents meet or exceed the original spec and carry the same installation warranty. Call (650) 560-7228 to confirm availability for your specific model.
Rowan Construction Group Redwood City is an independent service provider; we are not affiliated with or endorsed by Mr-Glass. We source parts through authorized distributors and maintain compatibility documentation for all three product series.
Measure twice, document once, build it so it doesn’t come back. That’s how Grant Rowan has run crews since 2007, and it’s why we keep a written price in front of every customer before the first tool comes off the truck. If your Mr-Glass roof is showing symptoms, call (650) 560-7228 to schedule your free estimate. We’ll deliver a flat written price with a documented photo record, and we won’t start until you’ve seen both.
Written by Grant Rowan, Owner, Rowan Construction Group Redwood City at Rowan Construction Group Redwood City, serving Redwood City and nearby areas.