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Question DetailsAsked on 6/8/2016

had a slide window put in rv, when it rain it leak

the window don't have a ledge or a awning over it. so when it rain is coming on the inside of the window track filling up and spill over to the floor

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1 Answer


If it is coming in AROUND or outside the window frame, then lack of a dripcap over the top could be the problem - or if just caulked in might not be fully caulked at the top or sides or it is dried out and cracked, letting water in.

If coming in through /over the track then my first guess would be the window was put in backwards - the window should be built so the inside track rail or lip is raised above the bottom of the window AND above the center ridge between sliders and above the track parts or rail "outward" of the inside rail - or in some makes the center rail and the outer rail for the outer of the two windows has a drain channel or hole or cutout in it to let the water in the track drain off on, through, or under the sill to drip off to the ground.

Typically, interior sill is horizontal, outer sill slopes away noticeably to drain the water. If put in backwards, then the water would drain to the inside.

Similarly, if put in upside down, commonly only the bottom sill has drainage provision, not the top one - so if put in upside down the now-bottom track would fill up with water and overflow (having no place to drain), possibly to the inside.

Another common possibility is the installer did not understand what the drain cutouts or channels in the sill were for and caulked them up - some drain within and through the metal bottom sill extrusion and drain out at holes or slots in the front of the sill or under the front lip, which will not do so if caulked in - either because the installer thought those were possible places for water to get in, or because he got carried away with the caulking.

If a recent install - I would take it back for them to do it right at not additional cost to you. If not, I would check out any drain slot or notch locations and go to manufacturer website or instruction sheet (if you know/have them) and look to see if installed right way up/around.

Otherwise, assuming caulk around the outside of the frame is good, going back to an RV/Trailer service company would be your only choice - your call on whether the original place can be expected to do a better job this time than last or if you need to try a different one.

If convinced it is a problem at the top you could also buy a piece of dripcap that will extend out over the window, put in long-life silicone caulk at the contact point and install it to the side of the RV with short sheet metal screws - but a drip cap just keeps runoff from the side of the vehicle from contacting the top of the frame so is a secondary protection against leaks there, but by itself does nothing to stop leaks in/around the window. Commonly looks like this - you have to be sure to caulk along the back of the top edge when installing if you can't tuck the top edge up under the siding like on a house - and put the screws fairly close together and fairly near the top edge to compress the silicone bead there. A headier-duty dripcap will work better for you because the light-guage type designed to slip up under lap siding will buckle and kink when you screw into it unless you screw through a stiffener, which of course can make it leak down behind it.

Or you can buy an aftermarket add-on awning or canopy, though you have to worry about how it stores when driving and of course will not protect from rain while driving and the awning/canopy is not up.

RV Sales and Service is the Search the List category for this type of work.

Answered 3 years ago by LCD

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