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 14 hours ago 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!