Replacing a leaky or damaged skylight on your trailer is often a manageable DIY project that can significantly improve your RV’s interior and prevent further water damage. This comprehensive guide, informed by decades of RV repair experience, will walk you through the process, ensuring a successful and watertight installation.
Assessing the Damage and Gathering Your Supplies
Before diving in, a thorough assessment is crucial. Identify the extent of the damage: is it just the skylight dome, the sealant, or the entire unit? This determines whether you need a complete replacement or just a repair.
Tools and Materials You’ll Need:
- New skylight (matching size and type)
- Screwdriver (Phillips and/or flathead, depending on the screws used)
- Putty knife or scraper
- Heat gun (optional, for softening old sealant)
- Utility knife with sharp blades
- Mineral spirits or other adhesive remover
- Cleaning cloths
- Caulk gun
- RV-specific self-leveling sealant (e.g., Dicor Lap Sealant)
- Butyl tape
- Measuring tape
- Safety glasses
- Gloves
- Ladder (appropriate for your trailer height)
- Drill with appropriate bit (if pilot holes are needed)
- Shop vacuum
Removing the Old Skylight
Safety first! Wear safety glasses and gloves throughout the process. Start by working on the interior of your trailer.
Interior Removal Steps:
- Remove the interior trim ring. This is typically held in place with screws. Unscrew and carefully detach the trim ring.
- Examine the existing sealant. Note how the old sealant was applied. This provides valuable insight for your new application.
- Head to the Roof. Carefully climb onto the roof of your trailer, ensuring you have stable footing.
- Scrape away the old sealant. Use a putty knife or scraper to remove the bulk of the old sealant around the edges of the skylight. A heat gun can help soften stubborn sealant. Be careful not to damage the roof material.
- Cut through any remaining sealant. Use a utility knife to carefully cut through any sealant still adhering the skylight to the roof. Work slowly and cautiously.
- Remove the screws or fasteners. Many skylights are secured with screws. Remove all visible screws. Some may be hidden under sealant.
- Carefully lift the old skylight. With the sealant and screws removed, gently pry up the skylight. It may be stuck, so work slowly and apply even pressure. Have someone assist you from inside to prevent it from falling.
Preparing the Roof and Installing the New Skylight
A clean and properly prepared surface is essential for a watertight seal.
Preparing the Surface:
- Clean the roof surface thoroughly. Use mineral spirits or an adhesive remover to remove any remaining sealant residue. Scrub the area clean and allow it to dry completely.
- Inspect the roof for damage. Look for any cracks, gaps, or soft spots in the roof material. Repair these before proceeding.
- Apply Butyl Tape. Place butyl tape around the edge of the opening where the new skylight will sit. Ensure the tape covers the entire perimeter.
Installing the New Skylight:
- Position the new skylight. Carefully place the new skylight into the opening, aligning it with the existing screw holes (if applicable).
- Secure the skylight with screws. If using screws, pre-drill pilot holes to prevent splitting the skylight frame. Use stainless steel screws that are the correct length. Do not overtighten.
- Apply Self-Leveling Sealant. Generously apply self-leveling sealant around the entire perimeter of the skylight, where it meets the roof. Ensure a thick, consistent bead of sealant covers all edges and screw heads.
- Inspect for Gaps. Double-check for any gaps in the sealant and fill them in.
- Allow the Sealant to Cure. Follow the sealant manufacturer’s instructions for curing time.
Reinstalling the Interior Trim
Once the exterior sealant is fully cured, you can reinstall the interior trim.
Interior Trim Reinstallation:
- Clean the trim ring. Remove any old sealant or dirt from the trim ring.
- Position the trim ring. Align the trim ring with the mounting holes and secure it with screws.
- Inspect the interior seal. Apply a bead of caulk around the inside edge of the trim ring to create an airtight seal.
Frequently Asked Questions (FAQs)
1. How do I choose the right replacement skylight?
Accurate measurements are critical. Measure the existing skylight’s outer dimensions and the inside diameter of the opening in the roof. Note the dome’s height and any specific features like ventilation. Match the type of skylight (e.g., dome, flat, vented) to ensure a proper fit and functionality. Online retailers specializing in RV parts offer a wide selection.
2. What is the best type of sealant to use?
RV-specific self-leveling sealant, such as Dicor Lap Sealant, is essential. This type of sealant is designed to withstand the elements, adhere to RV roof materials, and level out imperfections. Avoid using silicone-based sealants, as they can be difficult to remove later and may not adhere well to RV surfaces.
3. How do I remove stubborn old sealant?
A combination of tools and patience is key. Use a putty knife or scraper to remove the bulk of the sealant. A heat gun can soften the sealant, making it easier to scrape away. Mineral spirits or other adhesive removers can dissolve any remaining residue. Be careful not to damage the roof material.
4. Can I repair a cracked skylight dome instead of replacing the whole unit?
Small cracks can sometimes be repaired with RV-specific repair tape or a sealant designed for plastics. However, for larger cracks or significant damage, replacement is the best option for a long-lasting and watertight solution. Repairs are often temporary.
5. What if I can’t find an exact match for my old skylight?
Slightly larger sizes can often be adapted with careful trimming of the roof opening. However, ensure the new skylight’s frame covers the existing opening completely. Consult with an RV repair professional if you’re unsure. Smaller skylights are generally not recommended as they would require filling the larger opening.
6. How long does it take to replace a skylight?
The entire process typically takes 3-5 hours, depending on your experience level and the complexity of the installation. Allow extra time for sealant curing, which can take 24-48 hours.
7. What if it rains while I’m replacing the skylight?
Cover the roof opening with a tarp and secure it tightly. Wait for the weather to clear before proceeding. Water damage can occur if the roof is exposed to rain during the replacement process.
8. Do I need to hire a professional to replace my skylight?
If you’re comfortable with basic DIY projects and have the necessary tools, you can likely replace the skylight yourself. However, if you’re unsure or uncomfortable working on your RV’s roof, hiring a professional is recommended. Improper installation can lead to leaks and costly repairs.
9. How often should I inspect and reseal my skylight?
Inspect your skylight and sealant at least twice a year, preferably in the spring and fall. Reseal as needed, especially if you notice any cracks, gaps, or discoloration in the sealant.
10. What are the safety precautions I should take when working on my RV’s roof?
Always use a sturdy ladder and ensure it’s properly positioned. Wear non-slip shoes and use caution when moving around on the roof. If possible, have someone assist you. Avoid working on the roof in windy or wet conditions.
11. My roof is made of fiberglass. Does this change the installation process?
The process is largely the same, but be extra careful when using tools like putty knives and scrapers to avoid damaging the fiberglass. Consider using plastic tools instead of metal ones. The sealant type should also be compatible with fiberglass.
12. Can I replace a skylight with a vent?
Yes, you can usually replace a standard skylight with a vent. You will need to ensure the new vent is the correct size and type for your trailer. Wiring may be required for powered vents. Consult a professional if you are uncomfortable with electrical work.