Replace Skylight in RV Shower a Step by Step Guide

The RV shower skylight is a common source of leaks and water damage if the seal or glazing fails. This guide provides a practical, step by step approach to replace a damaged skylight, ensuring a watertight fit and long term reliability. It covers choosing a replacement, tools and materials, removal, installation, sealing, and leak testing. The process is suitable for most bunk, compact, and class A motorhomes with standard skylight dimensions.

Tools And Materials

Having the right equipment speeds up the job and reduces the risk of damage. Gather these items before starting:

  • Replacement RV skylight compatible with shower size and mounting style
  • Trim removal tools and putty knife
  • Non-sag sealant and compatible caulk (silicone or polyurethane as recommended by the skylight brand)
  • Butyl tape or weather-stripping for a flexible seal
  • Butyl rope or gasket for an extra seal under the flange
  • Caulk gun, masking tape, and cleaning supplies (isopropyl alcohol, rags)
  • Utility knife, screwdriver set, drill with bits, and silicone spreader
  • Exterior sealant remover (if old sealant is stubborn)
  • Safety gear: gloves, eye protection, and a stable ladder or step stool

Safety Precautions

Working on an RV roof and over a shower pan can be hazardous. Follow these precautions to prevent injury and water damage:

  • Work on dry surfaces and avoid slippery floors inside the RV
  • Disconnect power to affected circuits if wiring is exposed
  • Use a stable ladder or stand on a solid surface when reaching the skylight
  • Wear eye protection when cutting or removing old sealant
  • Ventilate the area if using strong solvents or cleaners

Diagnostics And Preparation

Before removing the old skylight, assess the current condition and prepare the area:

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  • Inspect the existing skylight for cracks, corrosion, or loose mounting screws
  • Check the interior shower ceiling for water stains or soft spots indicating rot
  • Measure the skylight opening and match it with a replacement that fits the existing flange
  • Clear the area around the skylight from inside and outside to access fasteners and sealants

Removing The Old Skylight

Careful removal avoids further damage and ensures a clean surface for the new unit:

  • From inside the shower, detach any trim or vent covers protecting the skylight frame
  • Remove exterior screws or bolts that secure the skylight flange to the roof
  • Gently pry the skylight loose using plastic trim tools to avoid scratching the exterior
  • Lift the skylight away from the opening and inspect the flange for damage or rot
  • Clean the opening thoroughly, removing old sealant with a plastic scraper and solvent

Choosing And Preparing The Replacement Skylight

Selecting the right skylight ensures compatibility and performance:

  • Choose a model with the same or slightly larger opening to avoid modifying the roof structure
  • Prefer RV-rated skylights with UV-rated acrylic or polycarbonate lenses for durability
  • Verify water-tight seals, gasket quality, and a secure mounting flange
  • Prepare the replacement by applying a thin bed of butyl tape to the underside of the flange
  • Pre-fit the skylight to verify alignment with the opening before applying sealant

Installing The Replacement Skylight

The installation should create a smooth, watertight seal around the entire perimeter:

  • Place the replacement skylight into the opening from the exterior side, guiding it into the flange
  • Insert and tighten mounting screws in a crisscross pattern to ensure even pressure
  • Apply a continuous bead of exterior sealant around the flange on the roof surface
  • Press the skylight firmly into the sealant and verify that the gasket seats evenly
  • Reinstall interior trim and any vent components, ensuring clear operation

Sealing And Finishing

A proper seal prevents leaks and prolongs skylight life:

  • Run a continuous sealant bead around the internal edge of the skylight flange as a secondary seal
  • Apply butyl tape or a gasket between the flange and roof surface for a flexible seal
  • Wipe away excess sealant and smooth with a silicone spreader for a neat finish
  • Inspect for gaps and reseal if any are detected after curing

Testing And Leak Check

Verification confirms installation integrity and protects the RV interior:

  • From the inside, lightly spray water around the skylight with a hose while an assistant observes for leaks
  • Check both interior and exterior seams for moisture, especially along the sealant lines
  • Inspect the interior ceiling for any signs of dampness over the next 24 to 48 hours
  • Operate the skylight vent to ensure a proper seal at various angles

Common Problems And Fixes

Anticipate challenges and know how to address them quickly:

  • Persistent leaks:** Recheck the exterior sealant and gasket seating; reseal if needed
  • Roof flex or movement:** Ensure screws are snug but not overtightened to avoid flange warping
  • Poor fit:** If the replacement doesn’t align, consider trimming the interior trim or using an adapter flange from the manufacturer
  • Fogging or condensation:** Improve ventilation and verify that the skylight’s venting mechanism closes properly