mounting systems for welsh slate roof

Martin Dawes · Nov 19, 2010

That looks pretty good. I suppose one of my big fears with getting involved in PV installs was maintaining the integrity of the roof and drilling through a tile defintely bothers me (probably unjustly).

Would you mind me asking who manufactures that system?

Markc · Nov 19, 2010

Mark.W said:
As above post has mentioned it is not just a standard rubber.

Tell me this does not look good! One of my installs!

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How do you sell this to your clients? I bet you get some concerned customers about drilling a hole straight through their roof. We haven't worked on slate roofs (Yet) but I would be concerned if it were my roof.

How does this comply with building regulations also? You should not drill a hole more than 10% of the rafter width. I assume this bolt is a M8 or M10?

Not knocking your install and I can't think of a practical solution either, its just a question!

Some pictures of the finished article may be good as well.

Thanks

Martin Dawes · Nov 19, 2010

One other thing, have you found that over-tightening of the bolt cracks the tile?

JulianC · Nov 19, 2010

Martin Dawes said:
One other thing, have you found that over-tightening of the bolt cracks the tile?

Was going to ask the same thing! Is this part of a proprietary PV mounting system? It looks a little flimsy to me and I'd be concerned about wind loading amongst other things. It just doesn't look strong enough to me.

Incidentally, I mentioned drilling through slates to mount rails to the roofing contractor we use on our installs. He screwed his face up. I can't tell you what he said since I believe this forum has a pretty good swear filter. Suffice to say, he didn't think much to it.

Mark.W · Nov 20, 2010

Markc said:
How do you sell this to your clients? I bet you get some concerned customers about drilling a hole straight through their roof. We haven't worked on slate roofs (Yet) but I would be concerned if it were my roof.

How does this comply with building regulations also? You should not drill a hole more than 10% of the rafter width. I assume this bolt is a M8 or M10?

Not knocking your install and I can't think of a practical solution either, its just a question!

Some pictures of the finished article may be good as well.

Thanks

Let's get this sorted quickly....!

This is an approved method of installation and the hanger bolts get bought from segen for this use. I always show the customer what is involved and they are more than happy to have their tiles drilled as long as it is water tight, which it is!! Try it for yourself before you slate this method, excuse the pun!
I did not say that I drilled an M8 or M10 size hole throught the joist, I drill a pilot hole with a 2mm drill bit and from the outside drill the hanger bolt into the joist! It would be ludricrous to drill an 8 or 10mm hole!

[ElectriciansForums.net] mounting systems for welsh slate roof

Mark.W · Nov 20, 2010

JulianC said:
Was going to ask the same thing! Is this part of a proprietary PV mounting system? It looks a little flimsy to me and I'd be concerned about wind loading amongst other things. It just doesn't look strong enough to me.

Incidentally, I mentioned drilling through slates to mount rails to the roofing contractor we use on our installs. He screwed his face up. I can't tell you what he said since I believe this forum has a pretty good swear filter. Suffice to say, he didn't think much to it.

I have around 50 install under my belt, and I have used various types of mounting systems, and to be honest the hanger bolts sit tighter than your normal roof anchors.

Mark.W · Nov 20, 2010

Martin Dawes said:
One other thing, have you found that over-tightening of the bolt cracks the tile?

You can adjust the nut on the bottom so you can drill literally the entire hanger bolt into the joist and then tighten up afterwards. You don't want to tighten too tight and you will know when you do because the rubber seal squashes.

solgen · Nov 20, 2010

Hi, I'm glad I re-opened this subject because as we all know it's a tricky one to deal with!

Mark W, you mentioned hanger bolts are an approved method - but are they approved for slate roofs and who says they are approved?

Thanks

Mark.W · Nov 20, 2010

solgen said:
Hi, I'm glad I re-opened this subject because as we all know it's a tricky one to deal with!

Mark W, you mentioned hanger bolts are an approved method - but are they approved for slate roofs and who says they are approved?

Thanks

Who do you want to approve it, the manufacturers of course! Of course they are approved for slate rooves that's what these specific hanger bolts are designed for. With any other roof you'd use a standard bracket!

Mark

solgen · Nov 20, 2010

Can you submit a link to the documention where you say the manufacturers recommended this type of fixing for slate roofs please as I have only seen them recommended profiled sheeting or corrugated sheeting.

Mark.W · Nov 20, 2010

I didn't say anywhere that it is the recommended method, there are a number of methods of fixing to a slate roof. This is the method I have found most effective.

Speak to your supplier. I've had enough!

Best of Luck!

solgen · Nov 20, 2010

Mark C,

I find your attitude to the people on this forum rather aggressive and abrupt! You seem to take peoples questions as some form of personal critism which in my opinion isn't the case. I believe we are just trying to learn from one another the best possible approach to challenging problems whilst keeping within MCS rules and manufacturers specifications. You have stated in a previous reply to MarkC ...

"This is an approved method of installation and the hanger bolts get bought from segen for this us"

I have looked on the Segen website and cannot find any documentation which states they are approved for slate roof mounting so I was rather hoping that you could direct me to where this is mentioned. I was incorrect in my previous e-mail using the word "recommended" I meant to use your word "approved" so my apologies for that.

All I and others are trying to do is exchange ideas and it seems that slate roofs are problematic and there isn't an ideal solution. Perhaps the method you describe is the best offering.

If anyone else has some considered opinions on this subject great!

Markc · Nov 20, 2010

Mark.W said:
Let's get this sorted quickly....!

This is an approved method of installation and the hanger bolts get bought from segen for this use. I always show the customer what is involved and they are more than happy to have their tiles drilled as long as it is water tight, which it is!! Try it for yourself before you slate this method, excuse the pun!
I did not say that I drilled an M8 or M10 size hole throught the joist, I drill a pilot hole with a 2mm drill bit and from the outside drill the hanger bolt into the joist! It would be ludricrous to drill an 8 or 10mm hole!

View attachment 2881 View attachment 2883 View attachment 2882

Charm down Mark, Just asking the question! As I said I'm NOT slating the work. It looks like a good installation method (As I said in my post).

I accept this is an approved method and was asking how you over come the customers concerns over drilling through their roof. I know some of my client would rather we didn't remove and replace tiles let alone drill them.

And where did I say you are drilling 8 or 10mm holes? I asked how you over come the building regs using this method? I assumed from the picture the bolt is a M8 or M10. Not that the bolt is like a coach screw? Not having used these I don't know.

Markc · Nov 20, 2010

solgen said:
Mark C,

I find your attitude to the people on this forum rather aggressive and abrupt! You seem to take peoples questions as some form of personal critism which in my opinion isn't the case. I believe we are just trying to learn from one another the best possible approach to challenging problems whilst keeping within MCS rules and manufacturers specifications. You have stated in a previous reply to MarkC ...

"This is an approved method of installation and the hanger bolts get bought from segen for this us"

I have looked on the Segen website and cannot find any documentation which states they are approved for slate roof mounting so I was rather hoping that you could direct me to where this is mentioned. I was incorrect in my previous e-mail using the word "recommended" I meant to use your word "approved" so my apologies for that.

All I and others are trying to do is exchange ideas and it seems that slate roofs are problematic and there isn't an ideal solution. Perhaps the method you describe is the best offering.

If anyone else has some considered opinions on this subject great!

Solgen.

Have I upset you? I certainly didn't mean to. I was only asking how Mark W over comes issues I know I would be asked about. I certainly didn't mean my post to be aggressive or abrupt and I have re read my post and can't see what I have said to upset.

I sincerely apologise if I have offended.

Mark C

GPack · Nov 20, 2010

Hey Mark. Chin up mate. This is probably the most useful thread I have followed on the forum. The information you have shared is really valuable and if I get a slate roof I will be using this method. As electricians I appreciate how nervous we all are about roofing. I think if the manufacturers instructions are followed, what's the problem. I think another way is to use a lead/aluminium slate but this is only from pictures I have seen over the past couple of weeks. I haven't had an install yet but I know this is a problem I will have to deal with in the future. I like the idea the the rubber seal starts to squash and so you are able to gauge the tightness. It wouldn't suprise me if the was a measurement in newtons in the manufactures instructions as well to get the correct torque setting. A phone call to them could establish that and if you're as interested as I am you will probably look into it further. Experience is king in this game and I think it would be foolish to ignore the advice of someone that has done over 50 installs.
Thanks for the photos you posted and sharing the knowledge

mounting systems for welsh slate roof

Martin Dawes

Markc

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Martin Dawes

JulianC

Mark.W

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Mark.W

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Mark.W

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solgen

Mark.W

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solgen

Mark.W

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solgen

Markc

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Markc

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GPack

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