Thread 2936237

I found this image on reddit which has almost the exact same circumstances as me, but I can't find much info on this online (or what it's called if this is even a thing)

Long story short, a property I've bought has some poor drainage, in large part due to the guttering being poorly maintained, shitty pipes, etc.

It has a long run on a roof of around 20m (50~ft) with two down pipes at either end, but because the guttering is all fucked it up only goes down one of them. I intend to just take out the existing guttering and putting my own in, but I do want to utilize both down pipes on either end to move as much water away from the property as possible. Is having the high point in the middle like image attached something that can/should be done?

>>2936237 (OP)
Not a roofer but yeah seems what you should do, with 20m you'd need a big gutter with more slope if you wanted just one down pipe. Also youll need 2 gutter sections anyway to avoid dilatation problems iirc

Yes absolutely do it as shown in the drawing.
i helped out a seamless gutter guy once

>>2936237 (OP)
Obviously you need to have a slope in the gutter if you want it to move water effectively, and that's exactly how you do it on a roof like that, slope from the middle. Also make sure to measure absolute slope (with a spirit or digital level), your roof may be slanted on a shitty old building.

>>2936258
>>2936274
Thank you anons

>>2936277
It's actually a long verandah that attaches to the main house (of the same length). Like the gutters that sit on it, it hasn't been well maintained and the posts that hold up the patio have got a bit of wood rot.

If I was intending to replace these posts regardless, should I do that first before replacing the gutters, as I imagine this will change the levels anyway? Updated pic attached, red rectangles are just the posts.

>>2936336
Well if the roof is uneven, then maybe start with the posts. But redoing the fixation points on the gutter shouldn't be that hard either way. Gutters on wood aren't a huge job.

Your drawing is right except that it does not take into account whether the house is level across the run. Pro tip it isn’t. Houses tend to settle in the center which will cause the ends to rise slightly.
So let’s say the center of the run is 2 inches low which you won’t see usually. Well now you push the gutter high in the center then using a 24 inch level you move from center out every 2 ft. and with the bubble just touching the line screw that bracket in. Proceed all the way to the outlet. The guttering will be more than 2 inches below the roof edge on the ends if you’re lucky. One trick in a settled house is to hold the center high for 10-15 ft then level. Another trick is to cut an inch off the back of the gutter to gain height in the center. More often than not you get two choices…gutter works, looks crooked or looks great holds water. Lastly just add a downspout in the low area which on a ranch looks like shit. Hope this helps. I’ve been installing guttering for 35 years along with my remodeling / house construction.

>>2936580
whats a way to check house grade if a 2' level won't cut it?

>>2936591
Laser level if you have the $200. Long hose with marks and water in it if you don't.

>>2936580
Thanks for the tips, anon.

As mentioned here >>2936336 the posts holding it up are affected by some wood rot, and the whole thing itself looks like a very DIY job originally, so I imagine it's already somewhat uneven. I'll make sure to check the levels (and re-adjust/fix with some new posts if needed) to make sure the high point is actually the high point.

First off no house is perfectly level. After years of guttering not only did I have an eye for it you start noticing certain styles of houses usually have the same problem. You can put your level on the bottom of the fascia board to see which way she drains. Why waist your time ? Short of jacking up your house there isn’t much you can do about it. As I stated before if you’re good you figure out the tricks to overcome the problem like I stated above.
Bad gutters are worse than no gutters. Hope this helps op. One last trick…instead of a level just fun a slow stream of water in the middle of the roof and as you move from your high point to the outlet drop the gutter until the water starts moving, attach and move down 2 ft.repeat.

In the UK rise / fall gutter brackets are popular.
Seems like a good solution since they can always be adjusted if the house settles unevenly, and if you jack up the house later you can adjust gutters again to suit.