Protecting render from TV mast
From the street I can see a few cases where a TV mast has been strapped
to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? -- Windmill, Use t m i l l J.R.R. Tolkien:- @ O n e t e l . c o m All that is gold does not glister / Not all who wander are lost |
Protecting render from TV mast
Windmill wrote:
From the street I can see a few cases where a TV mast has been strapped to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? Presumably a bit of rubber sheet under the bracket should spread the load and would be less likely to damage the render. Havent tried it tho. Maybe it would be better to have brackets with metal spikes on the inside which would cut thru the render and hold on the brick. |
Protecting render from TV mast
Windmill wrote:
From the street I can see a few cases where a TV mast has been strapped to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? Use of the brackets that uses packing strap instead of lashing wire? http://www.blake-uk.com/stackstrap.aspx Although I notice they now sell plastic corners for use with it, which weren't available when I put mine up. |
Protecting render from TV mast
On Apr 6, 2:38*pm, (Windmill)
wrote: From the street I can see a few cases where a TV mast has been strapped to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? I think you'll find the cracking is due to the mast waggling in wind. Esp. if it's a tall one. The bracket is attached too high, there is insufficient weight of brickwork above it to resist the tension forces generated. A dish would be worse as it catches the wind. Many chimneys are in bad state anyway, esp on older houses. So, down to cowboy aerial fixers. |
Protecting render from TV mast
In message , Windmill
wrote From the street I can see a few cases where a TV mast has been strapped to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? Why do you want to fit a dish to a chimney? It's more suited to being fitted to a wall. If you cannot fit it to the satellite facing side of a house http://www.wrightsaerials.tv/reference/dish-screened-by-roof.pdf -- Alan news2009 {at} admac {dot} myzen {dot} co {dot} uk |
Protecting render from TV mast
On Apr 7, 8:24*am, Alan wrote:
In message , Windmill wrote From the street I can see a few cases where a TV mast has been strapped to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? Why do you want to fit a dish to a chimney? *It's more suited to being fitted to a wall. If you cannot fit it to the satellite facing side of a house http://www.wrightsaerials.tv/reference/dish-screened-by-roof.pdf -- Alan news2009 {at} admac {dot} myzen {dot} co {dot} uk I have seen them on masts. They have to have a clear "view " of the satellite. |
Protecting render from TV mast
On 07/04/2012 08:55, harry wrote:
I have seen them on masts. They have to have a clear "view " of the satellite. Indeed. Ours has a clear view from just below first floor window level. Andy |
Protecting render from TV mast
On Apr 7, 3:07*pm, Andy Champ wrote:
On 07/04/2012 08:55, harry wrote: I have seen them on masts. They have to have a clear "view " of the satellite. Indeed. *Ours has a clear view from just below first floor window level.. Andy Mine six feet off the ground. (We are on a hill) |
Protecting render from TV mast
In article , Andy Champ
scribeth thus On 07/04/2012 08:55, harry wrote: I have seen them on masts. They have to have a clear "view " of the satellite. Indeed. Ours has a clear view from just below first floor window level. Andy Ours are out in the back garden, you can't see them too well but they can "see" the Sats.. As to chimney stacks on render perhaps thats in need to re doing as it often needs. Chimney lashings very rarely harm a chimney unless grossly under specified or with too large a windload imposed, more often they hold them together;!... -- Tony Sayer |
Protecting render from TV mast
harry writes:
On Apr 7, 3:07=A0pm, Andy Champ wrote: On 07/04/2012 08:55, harry wrote: I have seen them on masts. They have to have a clear "view " of the satellite. Indeed. =A0Ours has a clear view from just below first floor window level= . Andy Mine six feet off the ground. (We are on a hill) The place I was talking about is just outside a conservation area where planning permission is required to fit dishes, TV aerials, etc. and I'm guessing the neighbours wouldn't be too pleased by a dish on the wall facing them. So a dish on a mast strapped low down on a chimney and just above the flat roof, all near the back, seems the best bet. (I think!) -- Windmill, Use t m i l l J.R.R. Tolkien:- @ O n e t e l . c o m All that is gold does not glister / Not all who wander are lost |
Protecting render from TV mast
tony sayer writes:
In article , Andy Champ scribeth thus On 07/04/2012 08:55, harry wrote: I have seen them on masts. They have to have a clear "view " of the satellite. Indeed. Ours has a clear view from just below first floor window level. Andy Ours are out in the back garden, you can't see them too well but they can "see" the Sats.. As to chimney stacks on render perhaps thats in need to re doing as it often needs. Chimney lashings very rarely harm a chimney unless grossly under specified or with too large a windload imposed, more often they hold them together;!... Thanks for that; it's reassuring. -- Windmill, Use t m i l l J.R.R. Tolkien:- @ O n e t e l . c o m All that is gold does not glister / Not all who wander are lost |
Protecting render from TV mast
Andy Burns writes:
Windmill wrote: From the street I can see a few cases where a TV mast has been strapped to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? Use of the brackets that uses packing strap instead of lashing wire? http://www.blake-uk.com/stackstrap.aspx Although I notice they now sell plastic corners for use with it, which weren't available when I put mine up. I hadn't seen those, so I've got metal. May be a useful idea though. -- Windmill, Use t m i l l J.R.R. Tolkien:- @ O n e t e l . c o m All that is gold does not glister / Not all who wander are lost |
Protecting render from TV mast
"Rod Speed" writes:
Windmill wrote: From the street I can see a few cases where a TV mast has been strapped to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? Presumably a bit of rubber sheet under the bracket should spread the load and would be less likely to damage the render. Havent tried it tho. Maybe it would be better to have brackets with metal spikes on the inside which would cut thru the render and hold on the brick. Wouldn't that just crack the render? -- Windmill, Use t m i l l J.R.R. Tolkien:- @ O n e t e l . c o m All that is gold does not glister / Not all who wander are lost |
Protecting render from TV mast
Windmill wrote:
Andy writes: http://www.blake-uk.com/stackstrap.aspx I hadn't seen those, so I've got metal. May be a useful idea though. Certainly easy to fit, and easy to tell that it's fitted properly if (like me) you've not used lashing wire before and are worried if you get it wrong it'll end up at ground level ... |
Protecting render from TV mast
With render it might be worth isolating the bracket from the
surface... For small items "Rigifix" might work, they use a 10-12mm hole with a plastic plug, then an allen key driven sleeve, then a standard metric fastener (bolt) of M6-M8 can be screwed in preferably with some thread lock compound. For large items I would 25-38mm core drill via cordless through the render to brick work. Cut some acetal round bar longer than the render is thick, width chosen to fit within the core drilled holes and drilled to take a stainless screw. Drill the brickwork for Fischer SX10, fit together with stainless coach bolts. Silicone around the render-spacer interface. For a chimney, you run into several problems. Insufficient mass above the fixing. Very tall chimney do flex with a large aerial & gust loadings, or they crack resulting in the bracket pulling a brick out of the chimney (brick shaped hole in stack opposite, aerial & brick on roof). A crack in a very tall chimney will propogate until the thing if lucky starts to twist making it obvious - or simply plunge ground wards. So perhaps find a wall. |
Protecting render from TV mast
"Windmill" wrote in message
... "Rod Speed" writes: Windmill wrote: From the street I can see a few cases where a TV mast has been strapped to a chimney (the approved method AIUI) but, despite the metal corner brackets between the strap cable and the chimney, the render has been cracked at the chimney corners and has separated from the underlying brick. Is there any way to make this less likely, given that a cable would probably need to be under a fair amount of tension to hold a satellite dish firmly in place? Presumably a bit of rubber sheet under the bracket should spread the load and would be less likely to damage the render. Havent tried it tho. Maybe it would be better to have brackets with metal spikes on the inside which would cut thru the render and hold on the brick. Wouldn't that just crack the render? I was hoping it would just go thru the render. If it wouldn't, you could drill the render where it will go. |
Protecting render from TV mast
"Windmill" wrote in message
... harry writes: On Apr 7, 3:07=A0pm, Andy Champ wrote: On 07/04/2012 08:55, harry wrote: I have seen them on masts. They have to have a clear "view " of the satellite. Indeed. =A0Ours has a clear view from just below first floor window level= . Andy Mine six feet off the ground. (We are on a hill) The place I was talking about is just outside a conservation area where planning permission is required to fit dishes, TV aerials, etc. and I'm guessing the neighbours wouldn't be too pleased by a dish on the wall facing them. So a dish on a mast strapped low down on a chimney and just above the flat roof, all near the back, seems the best bet. (I think!) I just bolted mine down to the flat roof. |
Protecting render from TV mast
"Rod Speed" writes:
"Windmill" wrote in message ... harry writes: On Apr 7, 3:07=A0pm, Andy Champ wrote: On 07/04/2012 08:55, harry wrote: I have seen them on masts. They have to have a clear "view " of the satellite. Indeed. =A0Ours has a clear view from just below first floor window level= . Andy Mine six feet off the ground. (We are on a hill) The place I was talking about is just outside a conservation area where planning permission is required to fit dishes, TV aerials, etc. and I'm guessing the neighbours wouldn't be too pleased by a dish on the wall facing them. So a dish on a mast strapped low down on a chimney and just above the flat roof, all near the back, seems the best bet. (I think!) I just bolted mine down to the flat roof. Having seen too many 30,000 pound bills from the City for renewal of slightly larger roof areas, I'd be very nervous about that. (If those bills hadn't been split among 10, 20, or 30 flats, they would have been killers). -- Windmill, Use t m i l l J.R.R. Tolkien:- @ O n e t e l . c o m All that is gold does not glister / Not all who wander are lost |
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