Tin Soldier Posted May 23, 2018 Share Posted May 23, 2018 Morning another stupid question I'm looking to install two velux windows onto a roof with 22mm sarking boards over 25mm battens. the velux windows have a gutter at the top, run at a slope. The instructions show the cutting out of batten/counterbatten so there is none, with the gutter sitting directly on roof screwed into rafters. My roof makeup is sips panel, 25mm batten at 600 centres and then 150mm wide sarking boards. so without being up there and trying it out I'm struggling to see what to do here. do I put the gutter just on top of the sarking board, which means its higher up the window than shown below, do I remove the sarking board/part of it to attached to the batten below which would be at the same depth on the window as picture below, or removed sarking board and batten and have it at a lower depth.? confused. help appreciated. Link to comment Share on other sites More sharing options...
ProDave Posted May 23, 2018 Share Posted May 23, 2018 Have you got the correct flashing kit? Sarking and no battens on the sarking to me means slate nailed direct to the sarking. I suspect you might need a different flashing kit. Link to comment Share on other sites More sharing options...
Declan52 Posted May 23, 2018 Share Posted May 23, 2018 The bit of angle iron is slipped underneath the roof felt so any rain that gets that far runs down the felt hits it and then runs of to the side of the window. That's why it's cut at an angle. Link to comment Share on other sites More sharing options...
Tin Soldier Posted May 23, 2018 Author Share Posted May 23, 2018 I hope I've got the right flashing, Coupled Slate flashing, 100mm centre gap - that image above is taken from the installation instructions. Link to comment Share on other sites More sharing options...
Simplysimon Posted May 23, 2018 Share Posted May 23, 2018 surely you're fitting velux to sarking as opposed to velux to battens? there should be instructions for fitting to sarking Link to comment Share on other sites More sharing options...
Cpd Posted May 24, 2018 Share Posted May 24, 2018 The diagram shows the roof as being batton but your roof is sarking ? I would double check with velux that your starting with the right kit. Its really straight forward as everything should be self explanatory...... I have done 3 into sarking a few months ago, will see if I can find the info. Link to comment Share on other sites More sharing options...
TerryE Posted May 24, 2018 Share Posted May 24, 2018 I am curious as to why your spec has the sarking over the battens. Our TF warm roof is sarked with the roofing fabric directly on the sarking and the counter battened and battened on top of that and then slated. We have Fakro room lights and you need to choose the frame model and mounting kit depending on the covering profile, so you need to choose the correct combination for a top sarked profile. I assume that the same is the case for Velux. Your figures are for a batten over sarking profile. Link to comment Share on other sites More sharing options...
Tin Soldier Posted May 24, 2018 Author Share Posted May 24, 2018 Roof Panel Makeup from top to bottom. Slates Membrane Sarking Battens Fabric SIPS Panel Link to comment Share on other sites More sharing options...
bassanclan Posted May 24, 2018 Share Posted May 24, 2018 I would have imagined it would have been: Slate Batten Membrane Counter batten Sarking Fabric? Not sure what you mean here Sips panel Link to comment Share on other sites More sharing options...
bassanclan Posted May 25, 2018 Share Posted May 25, 2018 Without battens to fix the slates to, how will you know you are not running out of true/parallel? I presume you have to ping lines on the sarking and hope they line up with the battens underneath. Link to comment Share on other sites More sharing options...
Tin Soldier Posted May 25, 2018 Author Share Posted May 25, 2018 its Scottish roofing practice to nail slates direct to sarking board. 1 Link to comment Share on other sites More sharing options...
Alexphd1 Posted May 25, 2018 Share Posted May 25, 2018 4 hours ago, bassanclan said: Without battens to fix the slates to, how will you know you are not running out of true/parallel? I presume you have to ping lines on the sarking and hope they line up with the battens underneath. That's what sorts the men from the boys?? Link to comment Share on other sites More sharing options...
Cpd Posted May 25, 2018 Share Posted May 25, 2018 On 24/05/2018 at 09:25, Tin Soldier said: Roof Panel Makeup from top to bottom. Slates Membrane Sarking Battens Fabric SIPS Panel Intrested to know what the fabric is as on a standed Scottish roof the breather membrane goes on top of the sarking, that way if you get a leak then the roofing membrane is there as the emergency layer. My roof is slates membrane 22mm x 150mm sarking boards ‘main roof timbers i dont have battens as the slate is reclaimed and vary in size (a traditional style) from the biggest / longest slates at the bottom of the roof and the smallest slates at the top. There is then a 50mm ventilated gap below the sarking before the insulation. But as usual there is a dozen ways to skin a cat and I am just interested in your build up and the solution to the velux installation. Link to comment Share on other sites More sharing options...
Tin Soldier Posted May 25, 2018 Author Share Posted May 25, 2018 so, the SIPS panels company threw up the panels and wrapped the house in nilvent on walls and daltex roofshield on Roof I didn't expect membrane to be put on at all so when questions the manager said Yes membrane is on, but you'll have to batten at 600 centres to leave a ventilation gap, then sarking board on top. I've put a second layer of membrane on the sarking (or I will once finished) as the roofshield has plenty holes it in where the lifting straps etc for the roof panels were cut off. Link to comment Share on other sites More sharing options...
SuperJohnG Posted February 9, 2021 Share Posted February 9, 2021 @Tin Soldier I'm undertaking this very task of planning at the moment to get the rooflights right. I have the same build up planned as you, I'd be interested to hear how you got on in the end? and also what you done with the rooflights if you have an update? I have combination L profiles in my design (Rooflights that link up with walls on the window, but planning the structural openings is a complete PITA. Link to comment Share on other sites More sharing options...
TonyT Posted February 9, 2021 Share Posted February 9, 2021 My Install is the same as CPD, which is the norm, around my area. Link to comment Share on other sites More sharing options...
eandg Posted January 10, 2022 Share Posted January 10, 2022 On 09/02/2021 at 22:36, SuperJohnG said: @Tin Soldier I'm undertaking this very task of planning at the moment to get the rooflights right. I have the same build up planned as you, I'd be interested to hear how you got on in the end? and also what you done with the rooflights if you have an update? I have combination L profiles in my design (Rooflights that link up with walls on the window, but planning the structural openings is a complete PITA. How did you do it John? Link to comment Share on other sites More sharing options...
SuperJohnG Posted January 12, 2022 Share Posted January 12, 2022 On 10/01/2022 at 01:29, eandg said: How did you do it John? Hi I threw those gutter bits in the bin. Lol. Now looking at it, they could have went at the SIPS panel level under the membrane as per above to get water that runs down the inner membrane. The rooflights are fitted to the sarking, which is on battens, I have membrane in the SIPS panel and on sarking so in reality hard to fathom water getting in and being an issue also having no metal gutters like that at the level below would be just like having a normal trussed roof in Scotland with sarking. Link to comment Share on other sites More sharing options...
eandg Posted January 12, 2022 Share Posted January 12, 2022 1 minute ago, SuperJohnG said: Hi I threw those gutter bits in the bin. Lol. Now looking at it, they could have went at the SIPS panel level under the membrane as per above to get water that runs down the inner membrane. The rooflights are fitted to the sarking, which is on battens, I have membrane in the SIPS panel and on sarking so in reality hard to fathom water getting in and being an issue also having no metal gutters like that at the level below would be just like having a normal trussed roof in Scotland with sarking. Was it straightforward for your joiners to fit? I'm looking at roof openings just now and advice on another thread is not to go with the Velux standard as 10mm either side works - what did you do (and how did you make it as airtight etc. as the rest of your windows)? Link to comment Share on other sites More sharing options...
SuperJohnG Posted January 12, 2022 Share Posted January 12, 2022 47 minutes ago, eandg said: Was it straightforward for your joiners to fit? I'm looking at roof openings just now and advice on another thread is not to go with the Velux standard as 10mm either side works - what did you do (and how did you make it as airtight etc. as the rest of your windows)? Aye piss easy for the joiners. I would say 10mm will ne fine thats what we jad, do they state more? Airtightness was so far just expanding foam to fit them as they sit inside the kit panel just. I'll tape them later when doing the membrane inside with tescon vana airtightness tape. Bit no compribamd or that. Link to comment Share on other sites More sharing options...
eandg Posted January 12, 2022 Share Posted January 12, 2022 1 minute ago, SuperJohnG said: Aye piss easy for the joiners. I would say 10mm will ne fine thats what we jad, do they state more? Airtightness was so far just expanding foam to fit them as they sit inside the kit panel just. I'll tape them later when doing the membrane inside with tescon vana airtightness tape. Bit no compribamd or that. They say 40-60mm across the width and 45mm top to bottom. I'll just go with the 10mm either side then, cheers. Link to comment Share on other sites More sharing options...
SuperJohnG Posted January 12, 2022 Share Posted January 12, 2022 I have Fakro, sure they state 10mm. Link to comment Share on other sites More sharing options...
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