Has anyone installed Velux windows into roof with corrugated sheet roofing?

[Great_scot_selfbuild]

Anyone willing to share an example of a construction drawing showing the installation of velux in a roof with corrugated profile sheet covering, plus advice on the flashing kit?

 

I'm wanting to install the 7 x velux roof windows (940x1600) ourselves and looking for advice on which flashing kit we would need and how it will fit into the structural opening. Grateful for any experience / advice. We have all the other windows being installed by the supplier and although our builder could no doubt do these, I'm looking at which tasks we could manage ourselves and try and grapple some control of labour costs where it is more manageable for us to (perhaps) do.

 

The installation would be timed to take place whilst scaffolding is still in place and I'm expecting the windows to be lifted in place from inside the house.

 

Our fixed rooflights on the garage had huge up stands the windows simply sat on, whereas the rooflights openings for vellum have a structural opening (windows = 940x1600, structural opening = 960x1620) and we haven't yet received the construction drawings fro the architectural technician yet (on holiday until early Sep) - looking to understand what we should expect in advance of receiving the drawings. We'd like the velux to be flush with the roof rather than on upstands, and our roofing material will be plasticol coated corrugated (here - https://www.panelsandprofiles.co.uk/wp-content/uploads/2014/03/TPP-14-3-CORRUGATED-Roof-Load-Span.pdf) - photo of the finish attached as used on our garage.

 

Cross-section of a building regs drawing attached to show the section view with the velux window positions.

 

Our searches of Velux flashings for sheet profile roofing has led us here: https://www.roofingsuperstore.co.uk/browse/roof-windows/pitched-roof-windows/velux-flashings/filterby/code/edw.html

 

TIA...

[JamesP]

I used EDW for fitting 7 Velux in Tata Standing seam roof.

All I can add is take your time with the detail and an extra pair of strong arms for the lift.

Have a look at this for starters.

 

[Bramco]

@Great_scot_selfbuild

 

We didn't use Velux - hate the stand up edges.   We did use the Roofmaker skylights that it looks like you have used on your garage.  Ours are flush with the corrugated roof. Essentially you have to leave a large gap at the bottom of the roof light, create a slight slope and then mold a water resistant membrane across that and onto the top edge of the roof below the roof-light.

 

Ill have to check with the builder and architect what we eventually used - was 3 years ago.  EDIT: checked and we used -> https://www.deks.co.uk/fast-flash

 

See photo - I have the architects drawings for this if you DM me.

 

 

PS What's the reason for using Velux rather than the Roofmaker roof-lights?

 

 

Edited Wednesday at 09:07 by Bramco
flashing product link

[Great_scot_selfbuild]

2 hours ago, Bramco said:

@Great_scot_selfbuild

 

We didn't use Velux - hate the stand up edges.   We did use the Roofmaker skylights that it looks like you have used on your garage.  Ours are flush with the corrugated roof. Essentially you have to leave a large gap at the bottom of the roof light, create a slight slope and then mold a water resistant membrane across that and onto the top edge of the roof below the roof-light.

 

Ill have to check with the builder and architect what we eventually used - was 3 years ago.  EDIT: checked and we used -> https://www.deks.co.uk/fast-flash

 

See photo - I have the architects drawings for this if you DM me.

 

 

PS What's the reason for using Velux rather than the Roofmaker roof-lights?

 

 

@Bramco that looks like a very tidy finish. Our garage roof lights were actually from here - https://saris-extensions.co.uk/shop/skylights/pitched-roof/

 

but we’re looking for opening roof windows and part of the velux draw was the ability to plug in electric powered blinds and u-value. Not that we’ve committed yet so I’m continually reviewing options. 
 

What cladding is that you’ve used? Looks great. 

[Bramco]

@Great_scot_selfbuild - thanks, I'll tell the builders next time I see them.

 

Those saris rooflights look exactly the same as the Roofmaker rooflights we used -> https://roof-maker.co.uk/products/hinged-opening-flat-rooflights/.   Think they do these in a variety of glass types/u values.  Ours are triple glazed as in the link and work very well.   

 

On the blinds aspect, ours are in the living space and bathrooms and on a landing, so we're not worried about having blinds.  Wonder if @JamesP has blinds?  If you're thinking blinds to cut out solar gain, then maybe it would be enough to simply open the roof lights to dissipate the heat. Works for us.

 

The cladding is Greencoat (afaik) specced for longevity.  I can check the exact spec if you need that.

 

Here's a link to the architect's web site with more photos -> https://lhc.net/projects/ashcroft-creating-a-low-energy-family-home/

 

 

[JamesP]

5 hours ago, Bramco said:

@Great_scot_selfbuild - thanks, I'll tell the builders next time I see them.

 

Those saris rooflights look exactly the same as the Roofmaker rooflights we used -> https://roof-maker.co.uk/products/hinged-opening-flat-rooflights/.   Think they do these in a variety of glass types/u values.  Ours are triple glazed as in the link and work very well.   

 

On the blinds aspect, ours are in the living space and bathrooms and on a landing, so we're not worried about having blinds.  Wonder if @JamesP has blinds?  If you're thinking blinds to cut out solar gain, then maybe it would be enough to simply open the roof lights to dissipate the heat. Works for us.

 

The cladding is Greencoat (afaik) specced for longevity.  I can check the exact spec if you need that.

 

Here's a link to the architect's web site with more photos -> https://lhc.net/projects/ashcroft-creating-a-low-energy-family-home/

 

 

@Bramco That is a fab project and build, the flush roof lights very smart.

All our triple glazed Velux are on the 1st floor, bedrooms, bathrooms and landing with fitted internal blinds, just about accessible if you are 5'9" +.

Would  consider solar glass or external blinds and in hindsight have the large fixed window at the gable end opening.

2 in each bedroom to provide some cross ventilation but will be connecting (plumbed in during build) AC to provide proper cooling. 

 

[Great_scot_selfbuild]

17 minutes ago, JamesP said:

@Bramco That is a fab project and build, the flush roof lights very smart.

All our triple glazed Velux are on the 1st floor, bedrooms, bathrooms and landing with fitted internal blinds, just about accessible if you are 5'9" +.

Would  consider solar glass or external blinds and in hindsight have the large fixed window at the gable end opening.

2 in each bedroom to provide some cross ventilation but will be connecting (plumbed in during build) AC to provide proper cooling. 

 

@JamesP lovely looking build. We gave our architectural technician the size of velux window we wanted and they have applied the same tolerance gap around the velux window size as the window company wanted for the windows elsewhere - how did your structural opening compare to the velux size on yours?

[Kelvin]

We had a scary moment fitting the first  long 3G one. I was in the inside and two guys on the outside. As we hadn’t quite understood the guide we didn’t fully understand how to set it properly. One of the lads on the outside opened the window at angle and we heard a loud click like something had broken. So I’m on the inside holding it up with one of the other guys holding the instructions up for me to read and then yelling at them to do the same thing to the other side. RTFM before fitting it. 

[Great_scot_selfbuild]

6 hours ago, Bramco said:

@Great_scot_selfbuild - thanks, I'll tell the builders next time I see them.

 

Those saris rooflights look exactly the same as the Roofmaker rooflights we used -> https://roof-maker.co.uk/products/hinged-opening-flat-rooflights/.   Think they do these in a variety of glass types/u values.  Ours are triple glazed as in the link and work very well.   

 

On the blinds aspect, ours are in the living space and bathrooms and on a landing, so we're not worried about having blinds.  Wonder if @JamesP has blinds?  If you're thinking blinds to cut out solar gain, then maybe it would be enough to simply open the roof lights to dissipate the heat. Works for us.

 

The cladding is Greencoat (afaik) specced for longevity.  I can check the exact spec if you need that.

 

Here's a link to the architect's web site with more photos -> https://lhc.net/projects/ashcroft-creating-a-low-energy-family-home/

 

 

@Bramco I should have been clearer - the cladding question was about the timber cladding - I searched for Greencoat, but that seems to be the roof sheeting, unless my searching is off?

[Gus Potter]

Check that you flashings are compatible with the cladding in terms of galvanic corrosion. 

 

Get a good innovative and skilled  roofer and discuss / walk through how you make them weather tight, you may need a "bespoke solution depending on how " flush" you want things. 

 

 

[JamesP]

41 minutes ago, Great_scot_selfbuild said:

@JamesP lovely looking build. We gave our architectural technician the size of velux window we wanted and they have applied the same tolerance gap around the velux window size as the window company wanted for the windows elsewhere - how did your structural opening compare to the velux size on yours?

From memory I probably allowed 25mm on each side as I then fitted Pavatex 20mm reveal board around all openings for windows. 

[Great_scot_selfbuild]

2 hours ago, Gus Potter said:

Check that you flashings are compatible with the cladding in terms of galvanic corrosion. 

 

Get a good innovative and skilled  roofer and discuss / walk through how you make them weather tight, you may need a "bespoke solution depending on how " flush" you want things. 

 

 

@Gus Potter thanks. We certainly had that approach for the garage but would rather not spend huge amounts on tailored lead flashing, though we know it would work. There were no off-the-shelf flashing kits for the garage rooflights, whereas at least the velux does offer some. Good point about considering the corrosion aspect - the corrugated sheeting is plastic coated on both sides but depending on how the fixing and overlap is done, this certainly needs considering - appreciate it.

[Gus Potter]

1 hour ago, JamesP said:

From memory

That looks a tidy job but what's underneath which is what we would like to know!

[saveasteading]

There is another rooflight manufacturer called Fakro. Polish I think. A fair bit cheaper and still very good.

 

There are standard details for skylights into profiled metal. The detail and workmanship need to be very good as ig us a very vulnerable point, almost like an internal gutter.

If the cladding is foam filled then this becomes exposed on the " crowns". You would want to be careful too with where side laps come as you wouldn't want a very narrow piece of cladding.

[dpmiller]

check out Keylite also

[Tom]

22 hours ago, Bramco said:

 

We didn't use Velux - hate the stand up edges.   We did use the Roofmaker skylights that it looks like you have used on your garage.  Ours are flush with the corrugated roof. Essentially you have to leave a large gap at the bottom of the roof light, create a slight slope and then mold a water resistant membrane across that and onto the top edge of the roof below the roof-light.

 

Ill have to check with the builder and architect what we eventually used - was 3 years ago.  EDIT: checked and we used -> https://www.deks.co.uk/fast-flash

 

 

 

 

We used the Roofmaker rooflights in our corrugated roof - much preferred them over the Velux/Fakro, but much more expensive. I used lead rather than self-adhesive flashing which was a bit of a pain as it needed lots of shaping to follow the corrugations but the end result looks good.

[saveasteading]

11 minutes ago, Tom said:

rooflights in our corrugated roof

We are going for integrated profiled skylights. They fit in with the cladding. They aren't pretty and don't open, but they won't leak, are £300 each, and they are only for daylight in big spaces. It depends if you need them as windows and perhaps appearance.

[Bramco]

11 hours ago, Great_scot_selfbuild said:

@Bramco I should have been clearer - the cladding question was about the timber cladding - I searched for Greencoat, but that seems to be the roof sheeting, unless my searching is off?

@Great_scot_selfbuild

 

Timber cladding is larch treated with SiOO:X which stops it greying -> https://www.russwood.co.uk. It actually gets lighter over time.

[Bramco]

32 minutes ago, Tom said:

 

We used the Roofmaker rooflights in our corrugated roof - much preferred them over the Velux/Fakro, but much more expensive. I used lead rather than self-adhesive flashing which was a bit of a pain as it needed lots of shaping to follow the corrugations but the end result looks good.

So are we going to get any photos of the finished article?

[Great_scot_selfbuild]

34 minutes ago, saveasteading said:

We are going for integrated profiled skylights. They fit in with the cladding. They aren't pretty and don't open, but they won't leak, are £300 each, and they are only for daylight in big spaces. It depends if you need them as windows and perhaps appearance.

@saveasteading can you share a link? We do want them opening as a preference (certainly for the bathrooms), and hence having them matching. But that said, I like researching and making sure we’ve considered everything. That and money is getting tight… (predictably)

[saveasteading]

3 minutes ago, Great_scot_selfbuild said:

can you share a link?

The cladding supplier is your best contact. Then it will integrate fully and br the same delivery.. If you had 20 then it's worth shopping around, but not for a few.

[Great_scot_selfbuild]

1 hour ago, Tom said:

 

We used the Roofmaker rooflights in our corrugated roof - much preferred them over the Velux/Fakro, but much more expensive. I used lead rather than self-adhesive flashing which was a bit of a pain as it needed lots of shaping to follow the corrugations but the end result looks good.

@Tom this is probably a totally different thread, but RE: lead flashing - did you do this yourself? The lead flashing labour costs for our garage were ££££!

[Tom]

33 minutes ago, Bramco said:

So are we going to get any photos of the finished article?

 

So needy!

 

Here's the leadwork after I'd finished bashing it around, and my set-up: had to keep the adjacent corrugations pressed down while hammering, to stop it all popping back up, whack-a-mole style. Fun times.

 

 

[Tom]

1 minute ago, Great_scot_selfbuild said:

@Tom this is probably a totally different thread, but RE: lead flashing - did you do this yourself? The lead flashing labour costs for our garage were ££££!

 

For the rooflights I did yes, as there was nothing too fancy involved. For our valley gutter I got a pro in as it needed welding in expansion joints etc

I quite enjoyed working with the lead tbh, seemed very forgiving.

[Great_scot_selfbuild]

@dpmiller @saveasteading I'm a little surprised but my searches are coming up with Velux being cheaper than Fakro (for the spec we're looking for), and I simply can't find Rooflite in the size we need. I had searched Fakro a while back, but it still seems to be surprisingly more expensive - I'd assumed that the more well known Velux name would have had bumped their price up.

 

If anyone's found a good/different Fakro or Rooflite supplier then let me know.

 

Spec:

940 x 1600mm

Triple-glazed

Centre-pivot

Manual