Velux Problem

Joined
22 Oct 2012
Messages
13
Reaction score
0
Country
United Kingdom
I recently posted this question in another section of this forum. Was advised to post it here instead.
I have an old cottage with two velux windows in a utility room. One of the windows has showed damp on the lower right corner of the ceiling. The windows were already installed when we purchase the house 11 years ago. I do not know when they were installed. I will add that for years they have been fine, only in the last year or so has one been a problem. I went out on to the roof and shot the video, but unfortunately cannot upload that t this website. So I attach photos of some of the window. Plus I think you can see the possible problem. Down the RHS (looking from outside) there is quite a large void you can slip fingers into, this does not seem right ? I did manage to slide the tiles over toward the RH edge of the window a bit more. Perhaps a fill with some mortar might be the answer. Any advice would be much appreciated.

Suffolkman
 

Attachments

  • LHS.jpg
    LHS.jpg
    311.3 KB · Views: 93
  • 1.jpg
    1.jpg
    261.5 KB · Views: 90
  • gutter.jpg
    gutter.jpg
    476.9 KB · Views: 85
  • Top.jpg
    Top.jpg
    419.5 KB · Views: 87
Sponsored Links
Joined
9 May 2020
Messages
7,402
Reaction score
135
Country
France
That looks like a right crappy installation. I would have expected the window to be installed a little above the tiles.
It might require a proper re-install at the correct height, and to ensure the flashing has been installed correctly.
 
Joined
16 Apr 2004
Messages
4,910
Reaction score
776
Country
United Kingdom
Not the best installation but the flashing should be far enough under to prevent water ingress. I see two issues; The way the tiles are cut will allow water to track under the slope of the cut tile and past the edge of the flashing. Secondly, before it completely rotted away, the black stuff to the left of the two grooves was a foam barrier. It's function was to prevent wind blowing into the void and possibly carrying water past the flashing. I also suspect it acted as a stop to direct water tracking under the sloping tile (issue 1) down to the flashing. You can buy strips of similar stuff from Screwfix. I'd try that first. It might be nothing more.
 
Joined
22 Oct 2012
Messages
13
Reaction score
0
Country
United Kingdom
Thanks both for your replies. I will take a proper look next week. I was wondering if t would be OK to mix up some mortar and fill under the tiles down that left hand edge. Maybe up onto that small half inch wide (approx) channel ?
 
Joined
29 Jul 2011
Messages
5,112
Reaction score
808
Location
Lancashire
Country
United Kingdom
If you can get some more tiles then cut the tiles so they almost touch the frame, that way you should be able to benefit from the tiles profile.
 
Joined
14 Jan 2013
Messages
16
Reaction score
1
Location
Suffolk
Country
United Kingdom
Yes.... I was thinking earlier..I do have some spare tiles somewhere. I will try that..thank you.
 
Sponsored Links
Joined
4 Jul 2013
Messages
1,230
Reaction score
212
Location
Dorset
Country
United Kingdom
As others have said the installation is very poor and the gap to the tile side laps is too wide.

However I would also be concerned about the base of the rooflight sitting in the gutter. That is a very poor detail and I wouldn't be surprised if water isn't tracking up under the apron flashing when you get heavy rain.
 
Joined
29 Jul 2011
Messages
5,112
Reaction score
808
Location
Lancashire
Country
United Kingdom
As others have said the installation is very poor and the gap to the tile side laps is too wide.

However I would also be concerned about the base of the rooflight sitting in the gutter. That is a very poor detail and I wouldn't be surprised if water isn't tracking up under the apron flashing when you get heavy rain.
Yes its poor but its been ok for 10 yrs
 
Joined
2 Feb 2006
Messages
45,304
Reaction score
3,111
Location
Staffordshire
Country
United Kingdom
As others have said the installation is very poor and the gap to the tile side laps is too wide.
It is normal to see large gaps on large profile tiles. The disparity between where the cut lands on a high or low spot can be stark.

However I would also be concerned about the base of the rooflight sitting in the gutter. That is a very poor detail and I wouldn't be surprised if water isn't tracking up under the apron flashing when you get heavy rain.
My thoughts also. That balcony outlet needs regular (cleaning) maintenance.
 
Joined
22 Oct 2012
Messages
13
Reaction score
0
Country
United Kingdom
Thank you to all for their input. Sorry for my delay in replying as I have been away. The general consensus is that it is a poor installation. BUT it has been OK for many years. I have got some spare tiles, so I will probably get up on the roof and cut some larger ones. I did suggest earlier in this thread about mixing up some mortar and filling the gap between the tiles and the left side of the velux. Nobody came back on that, so I assume this is not a good idea ?

Suffolkman
 
Joined
28 Jul 2015
Messages
1,327
Reaction score
224
Country
United Kingdom
I’ve seen it done on quite a few windows, but I haven’t got it on any of mine.

not sure you should need it, but who knows might help your situation.
 
Sponsored Links
Top