Outlet spouts and downpipes are best placed at LEAST 6 metres apart, and never more than 15m apart. The less downpipes you have, the more chance your gutters will overflow and clog up with debris more easily.
In the roofing industry, it’s generally given that one downspout and outlet pipe is needed for around every 6 metres. Naturally local weather patterns, the size and slope of the roof and also the drainage system will influence the distance needed.
The term ‘fall’ when we talk about gutters, is how much the gutter is made to drop, or slope, into outlet drainpipes. The accepted average is 20mm for every 5 metres of guttering, though if the pitch of your roof is steeper it may need to be more, as more water will be collected faster.
If you look at a house from a distance, it can look like gutters are perfectly level with the edge of the walls. Gutters however should have a slight pitch from the house side, to the outer side, up to 2 inch’s down. The outer edge will then be higher than the building side.
If too much water falls onto, or is directed onto from spilling over roofs above, it can cause many problems. Not only can it was away landscaped slopes, but can also backflow under a home’s foundation slab and cause cracks to form in the external and internal walls.
The main purpose of gutters is to direct water away from the roof, and building, into a safe drainage area. Even though metal roofs are naturally water proof and wont stain from running water coursing over them, water running down your external walls and pooling at the base will cause erosion and structural problems.
Ideally gutters should be made to match either the trim, or the roof colour. If the trim on your home is thin, or non-existent then the gutter colour should match the roof. If the trim is wide and a main feature, then the colour of your gutters should match that.
Roofing hammers and hatchets were the main tools used by roofers when installing or repairing new roof materials. These days however most roofers prefer to use nail guns. Even though there are more safety issues with nail guns, they are much faster to use.