Home>Discussions>DOORS & WINDOWS>Velux skylight question...
8 posts / 0 new
Last post
frankjc
Velux skylight question...

Hi, I have a Velux fixed skylight in my bathroom which has developed a leak. The drywall at the bottom edge was wet and damaged. I am trying to rule out a condensation problem, before we climb up on the roof. In my internet search, I have read that the Velux skylights have a "self draining" feature for condensation, that drains it to the outside. I can't find any information on how this works, or any diagrams. Does anyone know? I am wondering if the condensation has been building up and finding it's way between the roof and drywall. It's a cape style house, so there is no attic above the bathroom.

Thanks in advance.

Todd82TA
Re: Velux skylight question...

Condenscation would occur with a temperature difference between inside and outside ambient air (obviously), but that would mean that it's a single pane? If it was self-draining to the outside, that would mean that there's some sort of opening, and possibly that it could be clogged. I wonder why they would develop such a thing? Sorry i can't be of any real help... but if it's a double-pane sunroof with an inert gas in the middle, then I'm doubting that it has any kind of condensation drain.

frankjc
Re: Velux skylight question...

It gets soaked when taking a shower because it's right above the shower. Something I read online, I can't remember where said that they have some sort of self draining system that directs the condensation outside. I the same thing that you just said, if something was plugged up.

HandyAndyInMtAiry
Re: Velux skylight question...

Frank,

Does the water build up only when one is in the shower with the hot water running? You should always have a hot airy vent running while the shower water is running.

The best way to determine what is really at fault, is to get on the roof and take a look. For a Velux skylight, a deck, or curb that protrudes above the roofline is what the window sits on. The condensation that builds up, runs to the lowest section of the window by means of gravity. But at the same time, so does dirt, debris, rain water and everything else. This is on the outside of the window. There are most likely drain holes in the frame, just like any of the other metal frame windows in a newer house. Those MUST be kept free of debris, or they will become clogged. Kind of difficult to do when they are on the outside of the house, on the roof. Another thing that may have failed is the flashing between the curb and the shingles. Just because you are seeing water in the bottom corner of the window, does not mean that is where the leak is originating. Follow the dark stained wood until you find the issue that is causing the leak. There is no real set of instructions to finding a water leak, you must investigate and see what you see. The area that is causing the issue will show itself. Touch, push, dig, try to move things, etc.... until you find where the water is coming in, or the part that is not doing its job to keep the water out.

While on the roof, I would look at both the flashing and the wood frame. Look for signs of water intrusion or failed components. Once you clean off everything, all around the glass, the frame, the curb, any where that dirt can build up and sit. Take some water and pour or spray over the window and have someone on the inside check for leaks.

This problem will only get worse, there is no magic to fix this issue. You Must fix this from the outside of the house, not by using some paint that says will stop leaks. Once you get this fixed from the outside, repair the inside. Remove the sheetrock from around window where it has been wet, replace with new, prime and paint.

Andrew

Handy Andy In Mt Airy NC

frankjc
Re: Velux skylight question...

On this page it talks about gaskets designed to drain condensation to the outside.     https://www.veluxsolutions.com/solutions_website/condensation.html

Also, I find this picture a bit peculiar.

It looks like water has been running down the corner. I wonder if it made it's way through the cracks. The woodoworking around it is very poorly made.

 

Attachment: 
HandyAndyInMtAiry
Re: Velux skylight question...

Frank,

Water will always, always flow down hill.

I have never heard anyone that Loves skylights, and does not have issues with theirs.

Andrew

Handy Andy In Mt Airy

frankjc
Re: Velux skylight question...

I think the real solution is going to be to take it out and close up the opening. I don't love it enough to deal with things like this. I think I have the problem figured out. I am just trying to decide if I want to remove it now, or seal the leak and do it in the spring.

HandyAndyInMtAiry
Re: Velux skylight question...

Frank,

I like that choice. I believe that you will be much happier that way. At least your house will thank you for covering the hole and keeping it dry

Andrew

Handy Andy In Mt Airy NC

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.