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Chimney Brackets

IMPORTANT

We ship brackets from several suppliers and there may be significant differences between their dimensions. The photographs and dimensions on this page may differ from what we send you. Descriptions such as "6 inch bracket" are merely catalogue references and often refer to the largest dimension, rather than a distance between holes or stand-off. You can ask Technical Department for specific measurements but these may be taken from a bracket in one warehouse and your order delivered from a different batch in another warehouse. We recommend you buy a bracket at least one size larger than you think you need!

MASTS

Masts less than 1.5" diameter are generally intended for indoor use or for use with very small "contract aerials" (which we don't sell). We recommend you use the largest diameter aluminium mast you can accommodate and keep it short as possible. Steel masts are stronger to begin with but non-galvanised ones rust quickly; they create ugly brown stains and snap after a few years of rusting.

PAINTING

Where we state that a bracket is galvanised, it probably is, but we can't guarantee the zinc thickness or integrity. Where we don't state "galvanised", it probably isn't. Whether or not the bracket is galvanised, we recommend that you give it several coats of outdoor paint to protect it and to avoid rust stains running down your wall. Coat all threads with silicone grease, to prevent rust and make it easy to release nuts and bolts in the future. (Most of our brackets are sold to DIY people who don't want to pay a lot for a really long-lasting finish but are prepared to spend time painting and finishing.)

SAFETY

"Can you tell me whether my chimney/wall is strong enough for...?
Can you tell me whether this bracket will be suitable for...?

Unfortunately, I'm not a structural engineer or an installer, and maths is not my strong point, so, even if you were able to give me parameters such as wind speed and direction, any advice I might give would be guesswork based on no practical experience. You should always consult a qualified structural engineer before mounting a dish or large aerial on a chimney. The chimney needs to be in perfect condition. You should never drill a chimney; always use a chimney lashing kit.

One thing I will suggest, however, is that any large dish (over 60 cm) ought to be mounted on a short pole between two supporting brackets so that the pole is held rigidly and NOT as shown in this picture.

(If you have to mount it above the top bracket, place the dish bracket as close to the support bracket as possible.)

dish on brackets

Distance between brackets must be at least 1/5 of the distance between lowest bracket and aerial or dish.

Of course the final deciding factor with any installation is the strength of your chimney!

A25127 13" lashing cradle. Requires single lashing kit A17324 and 2" U bolts. Up to 10' mast. OK for large aerials up to DAT75.

 

A79306 Self supporting bracket for very large chimneys or where you don't want to damage the brick. Need good condition brick & mortar. Suitable for up to 6' mast and small aerial up to 19 element.

 

A25756 8" galvanised cradle. Requires single lashing kit A17324. Up to 8' mast. OK for large aerials up to DAT45. Distance between U bolts is approx. 8.5". Mast centre is held approx. 5.8" from chimney.

 

A17290 12" galvanised lashing bracket. Requires single lashing kit A17324. Up to 8' mast. OK for large aerials up to DAT45.

 

A21914 7.5" galvanised lashing bracket. Up to 6' mast with up to 19 element aerial.

 

A21897 6" galvanised lashing bracket. Up to 6' mast with up to 14 element aerial. Mast centre is held approx. 2.7" from chimney. Distance between U bolts is approx. 4.5".

 

A17273 6" pressed bracket for short mast and small aerial.

Mast strength, rough guide:
1" diameter steel mast = 1.25" aluminium.
1.25" diameter steel mast = 1.5" aluminium.
1.5" steel = 2" aluminium.
2" steel recommended for 10' or longer.

A25127 13

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