IKO Bathroom Remodeling Nationwide

IKO Bathroom Remodeling: The Redwood City Owner’s Guide

IKO bathroom remodeling in Redwood City typically runs $9,000-$28,000 for a full replacement, with most projects quoted in writing within 24 hours of our site visit. We stock IKO-compatible waterproofing membranes, underlayment, and flashing components for same-day starts on approved estimates. Most Redwood City homeowners first notice trouble when tile grout cracks along shower walls or water stains appear on ceiling drywall below a second-floor bath - signs that the IKO membrane system beneath has reached its service limit.

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Which IKO Models This Applies To

IKO’s Proforment and ShowerSeal membrane lines are the two systems we encounter most often in Redwood City homes built between 1995 and 2015. The Proforment series carries a fabric-reinforced bituminous layer rated for 40-mil minimum thickness; ShowerSeal shifts to a modified polyethylene core at 30 mil with pre-formed corner dams. You will find the product line printed on the membrane roll edge if any original material remains exposed at fixture cutouts. The date stamp matters: IKO revised the ShowerSeal adhesive formulation in 2008, and pre-revision rolls can delaminate at seams after 12-14 years in the Peninsula’s marine climate.

We source OEM IKO membrane where the original specification demands it, particularly for Proforment jobs where the fabric reinforcement must match existing layers for warranty continuity. For ShowerSeal replacements, we also carry a quality aftermarket equivalent from Noble Company that meets the same 30-mil spec and carries a 10-year material warranty. The compatibility gotcha: IKO’s pre-formed corner units from the 2008-2014 production run used a slightly different radius than current stock, so mixing old and new corner dams at the same shower base creates a seam gap that will weep. We measure every corner radius before ordering.

Signs Your IKO Bathroom Remodeling Is Failing

• Grout cracking in straight lines along shower walls. This usually means the IKO membrane beneath has lost adhesion and the tile layer is flexing independently of the substrate. In Redwood City’s clay-heavy soil zones, like the Stambaugh-Heller neighborhood, foundation settling accelerates this separation.
• Water stains on drywall ceilings below bathrooms. The IKO pan liner or wall membrane has perforated at a seam or fastener point. We find this most often where the original installer used non-IKO fasteners that corroded through the membrane.
• Musty odor that returns after cleaning. Moisture is trapped in the wall cavity because the IKO vapor barrier has degraded. The Peninsula’s salt air accelerates this in homes within a mile of the bay.
• Tile popping loose near the shower curb. The IKO curb membrane has delaminated from the wood framing, allowing water to swell the substrate and break thinset bond. This is the failure mode that taught us to always specify full-coverage curb wrapping, not just a strip.
• Soft spots in bathroom subfloor near the toilet or tub. The wax ring or tub seal has failed, but the IKO waterproofing did not extend far enough to protect the subfloor from incidental seepage. We see this in 1990s-era Redwood City tract homes where the original scope stopped at minimum code.

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Replacement Cost & What’s Included

The $9,000-$28,000 range for a full bathroom remodel in Redwood City reflects three variables: square footage, tile material cost, and whether we find substrate damage once the old system is out. Our quote separates materials from labor in writing, and the price you sign is the price you pay - Clause 1 of the Haven Standard. Every IKO membrane installation carries our 365-Day Done Right Promise and a documented photo record of the waterproofing layer before tile goes up.

DIY or Call Us?

An owner can safely check three things: confirm the water stain is active (run the shower, watch the ceiling), sniff for mold at electrical outlets near the wet wall, and photograph any visible membrane labeling for us to identify the system. What goes wrong fast: IKO membrane installation requires a continuous, torch- or roller-applied seam with no voids, and the curb-to-wall junction needs a pre-formed dam seated in fresh sealant. A missed seam or a fastener through the membrane field voids the warranty and traps water where you cannot see it. We have rebuilt four Redwood City bathrooms in the past two years where the homeowner’s DIY membrane job held for eight months, then saturated the subfloor. If you are weighing this, call (650) 560-7228 and we will walk through what we found on similar jobs - no charge for the conversation.

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