We space ours at 800mm centres as this works with a 4m length of gutter and falls right for the union.
For runs that are less than 4m we space them so that the gaps are even and not too cluttered.
You should always have a bracket close to an external corner.
We always clip our union brackets on last (after lining the regular brackets through) as these can effect the way the string line runs and almost always causes a dip at the union if you don't. Once you have clipped the union in place you can then eyeball it straight before fitting a screw.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local