Trapezoidal roof

[solgen]

Hi,

Just like to know how you take DC cables through a trapezoidal roof - does anyone have any pictures or diagrams of this?

Thanks

 

[Gavin A]

rule of thumb would be don't if at all possible, take it over and through the wall.

The only time we have done it we made use of the ridge covering, and went in between the ridge plate and the main sheeting, then used sticky back ali flashing to seal it, but knowing that it's already mostly covered anyway.

 

[SibertSolar]

Would the Dektite solar flashing for metal roofs be of any use in this scenario?
http://www.sibert.co.uk/consumables_info.php?id=48&p=148&c_id=46

 

[valet]

Why dont you drill though and put white rigid or flexible conduit in to the hole and seal with silicon? We done that in Caribbean looks ok.

 

[SolarCity]

Why dont you drill though and put white rigid or flexible conduit in to the hole and seal with silicon? We done that in Caribbean looks ok.

Silicon is a very bad idea on a flat roof. It will move and perish before long.

- - - Updated - - -

Why dont you drill though and put white rigid or flexible conduit in to the hole and seal with silicon? We done that in Caribbean looks ok.

Silicon is a very bad idea on a flat roof. It will move and perish before long.

 

[solgen]

rule of thumb would be don't if at all possible, take it over and through the wall.

The only time we have done it we made use of the ridge covering, and went in between the ridge plate and the main sheeting, then used sticky back ali flashing to seal it, but knowing that it's already mostly covered anyway.

Hi Gavin A,

The roof and sides of the building are made from the same material so I'm not sure what's best in this scenario. Maybe we can take cable through beneath apex covering and seal appropriately. I have looked at the Dektite solution but just wondered what other people have done before this has been available? Last thing we want to do is break any roof warranties!

 

[Gavin A]

you can drill the hole, and run the cable angled upwards on the wall though, and if you do it on the raised section then any water will usually just run harmlessly down the inside of the raised section if it does penetrate, then out the bottom, whereas on a roof any water ingress will end up somewhere it's not meant to be.

 

[mick barty]

We use the deck tight fitting done quite a few no problem, just make sure it's on higher profile and below a panel, looks a bit like a traffic cone in rubber with all weather seal at base and cut out at top, you can buy in various sizes from roofing suppliers

 

[Worcester]

We do lots and lots of these roofs and NEVER go through the roof, However, a lot of other things do come through them, vent stacks, oven flues, air con 'mushrooms' etc. If you HAVE go go through the roof, the decktite fitting is the solution.

Bear in mind these roof will almost certainly be double-skinned with insulation between the skins, and you need to take steps to avoid a cold bridge.