GSE in roof gutter detail

[Mattg4321]

Hi all

 

I’m about to fit the PV panels to the roof and have been studying the detail where the GSE system meets the gutter (there won’t be any tiles below the solar array). 
 

The GSE drawings show the flashing at the bottom running straight into the gutter, however my roof and most roofs have the fascia set higher than the rafter tails to kick the bottom tile up. This will inevitably leave a ‘trough’ at the bottom - although perhaps this is how it always is with just the membrane? Doesn’t seem right to me. 
 

Do I fit a sloped batten to kick up the drip flashing (so it’s properly supported over its full length) - seems a ball ache. Or do I adjust the height of the fascia - though this could be problematic as there are tiles either side of the array. 
 

Anyone fitted all the way to the gutter before? Thanks 

 

 

 

 

 

[JohnMo]

  On 18/08/2024 at 17:39, Mattg4321 said:

Do I fit a sloped batten to kick up the drip flashing (so it’s properly supported over its full length) - seems a ball ache. Or do I adjust the height of the fascia - though this could be problematic as there are tiles either side of the array. 

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Wouldn't you do this. To get the levels where you want them? Doing mine again I would miss out the GSE flashing and do lead instead 

 

 

 

[LiamJones]

I’ve just done this 

 

I used two eaves trays. Yeah they’re not 380mm like to instructions, but enough I was comfortable with.

 

I will do a full write up at some point 

[LiamJones]

Osb over rafter

memvrane

counter batten

and at the fascia..

 

fascia kicked up 70mm above rafter legs

eaves tray

mebrane

25mm ventilation 

eaves tray 

Gse tray

solar

[Mattg4321]

  On 18/08/2024 at 18:43, LiamJones said:

Osb over rafter

memvrane

counter batten

and at the fascia..

 

fascia kicked up 70mm above rafter legs

eaves tray

mebrane

25mm ventilation 

eaves tray 

Gse tray

solar

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https://www.screwfix.com/p/felt-support-tray-5-pack/36622?tc=OA5&gad_source=1&gbraid=0AAAAAD8IdPzgEcfCF_SZZDp8-alGqZ-b8&gclid=Cj0KCQjwt4a2BhD6ARIsALgH7DpeOwsWCIBweiO47Ge4dCTasY_lGPJ6KSErzIq2sQxveSer3WhYQtUaAqBnEALw_wcB&gclsrc=aw.ds#product_additional_details_container

 

Like this? I’ve already got the drip flashing (ubiflex), so I could use this in conjunction with the eaves support tray. 

[Dave Jones]

the trays finish at the bottom of the panel, there is no spare tray to lap into a gutter. Sounds like the bottom of your panels will actually be in the gutter ?

 

You have to flash 150mm up and under the GSE tray to make it waterproof.

[LiamJones]

  On 18/08/2024 at 19:13, Mattg4321 said:

https://www.screwfix.com/p/felt-support-tray-5-pack/36622?tc=OA5&gad_source=1&gbraid=0AAAAAD8IdPzgEcfCF_SZZDp8-alGqZ-b8&gclid=Cj0KCQjwt4a2BhD6ARIsALgH7DpeOwsWCIBweiO47Ge4dCTasY_lGPJ6KSErzIq2sQxveSer3WhYQtUaAqBnEALw_wcB&gclsrc=aw.ds#product_additional_details_container

 

Like this?

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Yep

[LnP]

  On 18/08/2024 at 18:41, LiamJones said:

I’ve just done this 

 

I used two eaves trays. Yeah they’re not 380mm like to instructions, but enough I was comfortable with.

 

I will do a full write up at some point 

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Nice tiles. What are they?

Thanks

[Alan Ambrose]

@JohnMo

 

>>> Doing mine again I would miss out the GSE flashing and do lead instead 

 

For a better look, or is there a functional reason too?

[JohnMo]

  On 19/08/2024 at 13:45, Alan Ambrose said:

For a better look,

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👍

[Mattg4321]

Thanks all, I'll try and remember to take some pictures and update this

[Conor]

We didn't go down to the gutter, but instead straight to a flat roof. I got a 300mm angled aluminium trim made up that went under the bottom tray and down on to the flat roof.

[LiamJones]

  On 19/08/2024 at 10:10, LnP said:

Nice tiles. What are they?

Thanks

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sandtoft rivius antique slate (interlocking clay). Best price I could get was £1.99+vat about 3 months ago 

[Alan Robson]

I have the exact same question and found this thread. I've got the eaves felt support trays fitted and roof membrane, just wondered if you sorted yours and if you have any finished pics?

[Mattg4321]

  On 02/09/2024 at 09:26, Alan Robson said:

I have the exact same question and found this thread. I've got the eaves felt support trays fitted and roof membrane, just wondered if you sorted yours and if you have any finished pics?

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It’s finished awaiting the roofers coming back to tile it in. 
 

It was a ball ache to be honest. The angle of the roof changing at the eaves meant nothing really sat quite as I wanted and it involved a lot of improvisation. 
 

I’m not sure how others have found it. I notice the poster earlier in this has some sort of slate? roof, so perhaps the kick at the bottom isn’t quite as pronounced as mine with concrete interlocking tiles. I don’t think I’d go to the gutter if I did it again if I could help it. 
 

 

[LiamJones]

I didn’t have a kick, just bought the fascia up to keep the fall of the tiles consistent all the way down. 

[LiamJones]

Maybe this photo helps? I fitted another eaves tray over the top of the vent and under the gse trays before fitting the panels. This additional eaves tray only spanned the gse trays. At the tiles I had just the one eaves tray. The fascia/vent height was consistent all the way along, however 

[Mattg4321]

  On 19/03/2025 at 07:33, LiamJones said:

Maybe this photo helps? I fitted another eaves tray over the top of the vent and under the gse trays before fitting the panels. This additional eaves tray only spanned the gse trays. At the tiles I had just the one eaves tray. The fascia/vent height was consistent all the way along, however 

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Didn’t you have any battens supporting the bottom of the GSE trays?

[Nick Laslett]

Screenshot from GSE YouTube video. It shows the support to the bottom of roof. 
 

 

 

The GSE tray on my install. The flashing hides the batten, but you can see the tray is supported. 
 

Edited March 19 by Nick Laslett

[Nick Laslett]

This photo is how the roofers left the roof before I started adding battens and installing the GSE trays. It is hard to see, you will need to zoom in, but there is a piece of roofing felt and roof membrane covering the bottom batten, creating the kick at the end of the roof line, the “tilting fillet”.

 

Edited March 19 by Nick Laslett

[LiamJones]

  On 19/03/2025 at 09:54, Mattg4321 said:

Didn’t you have any battens supporting the bottom of the GSE trays?

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There is a gold batten added towards the end of the roofing work, once I was confident of how the eaves detail would work. If you look back at the first photo I posted, you’ll see it

[Nick Laslett]