Homeowners struggle to renovate old Victorian/Edwardian bathrooms without causing structural damage from moisture

Homeowners with period properties face a critical dilemma: traditional waterproof bathroom materials can trap moisture in old walls, causing rot, mold, and expensive structural damage, while breathable alternatives are hard to find and their effectiveness is uncertain. Current solutions lack clear guidance on which materials work for historic homes, forcing owners to choose between risking their property's integrity or undertaking expensive trial-and-error renovations.