Lashing a satellite dish to a chimney (max size?)

[Seri]

I'm looking to upgrade my dish from a regular Sky Minidish to a 90cm Toroidal one with multiple LNB's to indulge my latest tinkering hobby.

I don't really want a hulking great dish on the front of the house as I think the Sky one at the moment looks bad enough, so I'm going to take this opportunity to move it to the back of the house as well.

Unfortunately, if I move it to the back, the only place I can mount it where it will still be able to see all the satellites I want is the chimney.

I've done some research and am aware that if it will be visible above the roof line then planning permission will be required.

I've also seen that you shouldn't drill into the chimney breast and instead use a lashing kit.

The problem is I can't see any of the lashing kits saying what the maximum loading is or whether they're suitable for more than just the standard sky mini dish.

Will I run into problems using a 90cm dish with a double lashing kit on a pole?

The dish I'm installing is this:
http://www.wavefrontier.us/Gallery.htm

The double lashing kits I'm looking at are like this:
http://int.rsdelivers.com/product/maxview/d4108-p/double-lashing-chimney-bracket-kit/3442536.aspx

Thanks

[Kipper at sea]

On Saturday, December 29, 2012 5:28:47 PM UTC, Seri wrote:
> I'm looking to upgrade my dish from a regular Sky Minidish to a 90cm Toroidal one with multiple LNB's to indulge my latest tinkering hobby. I don't really want a hulking great dish on the front of the house as I think the Sky one at the moment looks bad enough, so I'm going to take this opportunity to move it to the back of the house as well. Unfortunately, if I move it to the back, the only place I can mount it where it will still be able to see all the satellites I want is the chimney. I've done some research and am aware that if it will be visible above the roof line then planning permission will be required. I've also seen that you shouldn't drill into the chimney breast and instead use a lashing kit. The problem is I can't see any of the lashing kits saying what the maximum loading is or whether they're suitable for more than just the standard sky mini dish. Will I run into problems using a 90cm dish with a double lashing kit on a pole? The dish I'm installing is this: http://www.wavefrontier.us/Gallery.htm The double lashing kits I'm looking at are like this: http://int.rsdelivers.com/product/maxview/d4108-p/double-lashing-chimney-bracket-kit/3442536.aspx Thanks

I wouldn't bother too much about the lashing kit and pole, the instructions should tell you what weight it is designed to carry. Its will the chimneystack take the strain of wind leverage

[harry]

> The double lashing kits I'm looking at are like this:http://int.rsdelivers.com/product/maxview/d4108-p/double-lashing-chim...
>
> Thanks

Not a good idea especially in windy situations.
The extra wind force may bring the chimney down.

[Tim Watts]

I would lash it rather than bolt on - as the leverage combined with wind
rocking on the bolts can damage individual bricks - but the lashing kits
tend to pull the stack "together".

If the disk is no wider than the stack face it's nearest too, I cannot
imaging the wind loading will be any worse than it is for the chimney on its
own, but it's worth taking some care as chimneys falling to bits is rather
dangerous!

As for PP, I very much doubt if anyone gives a bollocks if it's on the
chimney. It's if it's on a massive pole 10 ft higher they might notice.


--
Tim Watts Personal Blog: http://www.dionic.net/tim/

"It would be better to live under robber barons than under omnipotent
moral busybodies."

[David WE Roberts]

X-post to uk.tech.digital-tv

"Seri" <saln...@gmail.com> wrote in message
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[Not even bunny]

Helmuth von Moltke the Elder

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[Seri]

Thanks for the input and the pointer to uk.tech.digital-tv, I wasn't aware of its existence.

Seri

[Brian Gaff]

Besides, poles tend to sing and vibrate probably the last thing you want in
a sat dish I'd have thought.

Brian

--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email: bri...@blueyonder.co.uk
______________________________________________________________________________________________________________


"Tim Watts" <tw+u...@dionic.net> wrote in message
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[Bill Wright]

David WE Roberts wrote:

>> The dish I'm installing is this:
>> http://www.wavefrontier.us/Gallery.htm
>>
>> The double lashing kits I'm looking at are like this:
>> http://int.rsdelivers.com/product/maxview/d4108-p/double-lashing-chimney-bracket-kit/3442536.aspx

Firstly, is the chimney strong enough? It needs to be a minimum of six
bricks by six bricks, and with really good mortar. Drive a screwdriver
into the mortar joints to check.
Use two double lashing kits. Mount the four lashing wires no less than
five courses apart. The top one should be five courses below the top of
the stack. The dish should ideally be half way down, between brackets 2
and 3.
Don't over-tighten the wires, but you will need to check them at least
once a year for tension. You must use corner plates.
Use a length of steel or aluminium scaffold tube. Aerial mast is no good
for this.
Check that the dish will mount onto a 2" pole. It might have a minimum
of 2.5".
The thing that might let you down in strong winds will be the flexing of
the brackets. You could lose signal momentarily.
The wind just above a sloping roof can be far stronger than it would be
elsewhere. It can literally lift you off your feet.

Bill

[R. Mark Clayton]

"David WE Roberts" <nos...@btinternet.com> wrote in message
news:ak8uk1...@mid.individual.net...

Difficult to give a definitive answer here, but a 90cm dish is large and has
an area of well over half a square metre, whereas a 45cm dish will have a
quarter of the area.

You are going to need a big, well built chimney.

1. Substantial - see elsewhere - a stack for four or more hearths.

2. High - you need substantial height [ergo weight] above the mounting point
to stop the wind thrust lifting the chimney up.

3. Well built - ideally stuck together with Portland cement rather than
mortar.

4. As discussed elsewhere, use straps and corner pieces.

Many Victorian chimneys are corbelled near the top so that rain drips off
rather than running down the wall. This will mean your bracket and / or
mast will need to cantilever out to clear it (and worsen the torque on the
chimney).

[Dave W]

Do you have a back garden? If so, how about mounting the dish at
ground level far enough away from the house to see the satellites?
--
Dave W

[Dave Liquorice]

On Mon, 31 Dec 2012 17:57:39 GMT, Dave W wrote:

> Do you have a back garden? If so, how about mounting the dish at
> ground level far enough away from the house to see the satellites?

Might have to have quite a long back garden, the elevation to Astra is
anything from 18 to 26 degrees depending on your latitude. Call it 22
degrees and a 30' high roof line:

Tan 22 = 30/d d = 30/Tan 22 = 74.25'

An option is the dish on a short pole at gutter level looking back over
the roof. Easier to install and gain access than up at the chimney, also
have a better bit of structure to bolt the mountings into.

--
Cheers
Dave.