Toto Roofing Nationwide

Toto Roofing: The Sherman Oaks Owner’s Guide

Toto roof drains, overflow assemblies, and flashing systems in Sherman Oaks typically run $400-$1,800 installed depending on access height and whether the membrane needs resealing. We stock common Toto roofing components for same-day replacement on low-slope and tile applications throughout the San Fernando Valley. Most Sherman Oaks homeowners discover a Toto drain or overflow failure during the first heavy rain after a dry spell, when water backs up into scuppers or stains appear on ceiling drywall beneath roof penetrations.

Call (213) 221-0788

Which Toto Models This Applies To

Toto’s roofing division, Toto Kiki (the company’s commercial and industrial plumbing products arm), manufactures several drainage and overflow systems found on flat and low-slope roofs across Sherman Oaks, particularly on mid-century modern homes and 1980s-1990s condo conversions near Ventura Boulevard. The T-50 series cast iron roof drains with 15-inch diameter sumps are the most common in our market; the T-100 overflow assemblies with 2-inch vertical outlets appear frequently on buildings with parapet walls.

To identify your part, check the cast iron body for a raised Toto logo and model stamp, usually on the sump flange. The T-50 and T-75 series use 304 stainless steel dome strainers with specific bolt patterns; aftermarket strainers from Wade or Zurn will thread on but won’t seat flush, which traps debris and accelerates corrosion in Sherman Oaks’ combination of hot sun and occasional standing water. We source OEM Toto gaskets and hardware, though for discontinued T-25 series drains we fabricate compatible replacement sumps from 16-gauge galvanized steel with EPDM seals rated for 180°F, which exceeds the thermal cycling these drains see on a typical Sherman Oaks roof.

We also stock parts for KraftMaid, Cambria, and Silestone product lines where roofing intersects with kitchen and bath venting.

Signs Your Toto Roofing Is Failing

• Standing water more than 48 hours after rain. Toto dome strainers clog with Valley oak pollen and leaf debris, but if clearing doesn’t restore flow, the cast iron sump has likely corroded through at the clamping ring. In Sherman Oaks, we see this most on north-facing drains where moisture lingers.
• Stains on ceiling drywall below roof drains. Water is bypassing the Toto compression gasket between drain body and roof membrane. The gasket hardens after 12-15 years of UV exposure and thermal cycling; replacement requires lifting the membrane flange, not just swapping the strainer.
• Overflow spouts weeping during normal rainfall. The Toto overflow assembly’s internal baffle has cracked or its O-ring seal has degraded. This is a design feature working incorrectly; overflows should only activate during blockage, not every storm.
• Gravel or ballast washing toward the drain in channels. The Toto drain’s clamping ring has loosened, creating a low spot where water concentrates instead of sheet-flowing. This accelerates membrane wear in a 3-foot radius around the penetration.
• Sewer odor from roof vents on hot days. Toto combination drain/vent systems use a water trap that evaporates during dry spells. If the trap primer line has failed, sewer gas escapes; the fix is usually a replacement vacuum breaker, not the drain itself.

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Replacement Cost & What’s Included

These prices include parts, labor, and our documented photo record. What drives the range: roof access (single-story versus three-story walk-up), whether the existing Toto body can be salvaged, and if the surrounding membrane requires heat-welded TPO patch or liquid-applied sealant. Under Clause 1 of the Haven Standard, we deliver a written price before any work starts; no change proceeds without a signed change order. Our 365-Day Done Right Promise covers the installation and any membrane work we perform. Roof replacement in Sherman Oaks runs $8,000-$20,000 if the drainage failure has compromised the broader system.

DIY or Call Us?

A homeowner can safely clear a Toto dome strainer of visible debris and run a garden hose into the drain to check flow rate. What you cannot safely do: torque the cast iron clamping ring bolts (over-tightening cracks the sump; under-tightening causes the leak you’re trying to fix), or cut into the roof membrane to replace a gasket. Working on a low-slope roof in Sherman Oaks means navigating parapets and often wet surfaces; falls from single-story heights cause the majority of serious residential roofing injuries we see reported locally.

If you’ve cleared the strainer and water still pools, or if you see rust staining on the clamping ring, the repair has moved past homeowner territory. Call (213) 221-0788 and we’ll schedule a free estimate with a written price before any work starts. Our crews carry OEM and compatible Toto components on the truck, and Grant Rowan reviews every roofing estimate personally to confirm the part match before we dispatch.

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