# Roof Vent and Fan Replacement: Cost, Hours and Process in Hacienda Heights Roof vent and fan replacement swaps a failed roof vent, powered fan or garnish assembly and rebuilds the sealant joint around the flange. It is the single most common roof line item on this site, because the vent flange is where most RV roofs begin to leak and where a cheap part fails first. ## Specifications - Price band: $250 to $1,200 - Shop hours: 1 to 5 hours - Turnaround tier: Light cosmetic - Insurance billable: yes - Parts lead time: In stock for standard 14 by 14, 5 to 10 business days for powered units - OEM brands: Fan-Tastic Vent, MaxxAir, Dometic, Ventline, Dicor, Camco ## Why the vent is where roofs start leaking A vent is a rectangular hole cut through the roof, framed, then covered by a flanged assembly screwed down over butyl tape and finished with lap sealant. That is four separate things that have to stay watertight: the butyl bed, the fastener heads, the sealant bead over them, and the lid gasket itself. The butyl is the primary seal and the sealant is secondary. When a shop installs a vent with sealant alone and no butyl bed, it holds for one season. We see that repeatedly, and the tell is a vent that leaks despite looking freshly sealed on top. The lid is the other half. A UV cracked lid does not leak while closed in dry weather, so owners often leave it, and then it comes apart in the first real storm and puts water straight into the coach. ## Powered fan options and what they actually change A basic vent moves air only when something else moves it. A powered fan moves measured volume, and on a coach used in the San Gabriel Valley summer that difference is significant: a good fan pulling through an open window is the cheapest cooling on an RV and takes meaningful load off the air conditioner. Fan-Tastic and MaxxAir units are the two we stock and install most. The practical distinction is the lid: a MaxxAir style vent cover lets the lid stay open in rain, which matters if you store the coach outdoors and want ventilation year round. A Fan-Tastic with a rain sensor closes itself, which matters more if the coach sits unattended. Either swap is a direct fit into a standard 14 by 14 opening in most cases. Where an older Ventline opening is non standard, the flange gets adapted, which adds an hour or two. - Manual vent replacement, lowest cost, no wiring - Powered fan, single speed, direct swap into a 14 by 14 - Powered fan, variable speed with rain sensor and thermostat - Vent cover addition over an existing vent for rain open ventilation - Garnish ring replacement where the interior trim is cracked ## How we install so it does not come back The old assembly comes out and the flange area is cleaned to bare roof material. That means all of the old butyl and sealant, not a scuff and a recoat. Anything left behind is a bond break waiting to open. Moisture readings are taken at the opening before the new unit goes in. If the framing around the cutout reads wet, we stop and address the decking, because screwing a new flange into soft luan produces a vent that loosens within a year. The new unit is bedded in fresh butyl, fastened to spec, and finished with a self leveling lap sealant appropriate to the roof material. Where the roof is a TPO or fiberglass surface, the sealant selection changes, which is why the material of your roof is one of the first questions at intake. ## Not included - We do not install a vent over wet decking. If the flange area reads wet, the decking is addressed first. - Interior ceiling panel replacement is a separate interior line item. ## Questions **How much does it cost to replace an RV roof vent?** A manual vent replacement with a proper flange reseal sits at the low end of the band on this page. A variable speed powered fan with a rain sensor sits near the top, mostly because of the part rather than the labor. Labor is one to five hours at the posted rate depending on whether the opening is standard and whether the interior garnish comes down. **Can I get a powered fan installed where I only have a plain vent?** Usually yes. Standard 14 by 14 openings accept a direct powered swap, and the 12 volt supply is typically already at the opening on coaches built in the last two decades. Where there is no supply, we run one, which adds to the hour count. **The vent leaks but the sealant looks new. Why?** Almost always because the assembly was installed on sealant alone with no butyl bed underneath the flange. Sealant on top is a secondary seal; it is not designed to be the only thing between the fastener holes and the interior. Correcting it means pulling the unit and bedding it properly. **Do you check for water damage while the vent is out?** Yes, and it is the most useful moment to do it. With the flange off we can read the framing and decking directly at the cutout rather than inferring it through the membrane. If it reads wet, you find out before a new part goes over the problem. --- Source: https://ocrv.club/rv-roof-repair/roof-vent-and-fan-replacement OCRV Center, 23281 La Palma Ave, Yorba Linda, CA 92887 Phone (949) 799-3387. Email info@ocrvcenter.com. Serving Hacienda Heights and the surrounding area. 18.4 miles, 24 to 38 minutes via SR-60 west to Fullerton Rd, then south to La Palma Ave. In shop work only. All estimates are priced and credited against an authorized repair.