Gutter question

[jpcjguy]

Hi all,

So I am getting quotes for gutters and looking at 6" vs. 5". My garage is 48x30x12 with a 8/12 pitch. So, with overhang, 50' for front and back.
One guy said I could get away with one downspout, others say I need 2.
What is everyone's thoughts? I do like the fact that if I do 1 downspout, it would be on the right side (see pic) and could be on the side of the garage, not the front. that would be more visually appealing from the patio (where I took the pic).
Quotes are in the 1250-1500 range for a color to match the trim. Sound about right?

 

[cjoffutt]

Quote is high compared to what I paid last year for my 6" seamless gutters on the house. ~175 feet of gutter, 4 downspouts. My total was right around $1300. But I'm sure location factors into this.

 

[FTG-05]

The rule of thumb is one DS/30 feet, at least according to the gutter people I've talked to.

I have the big 3x4 DS but only the 5" gutters. I'm upgrading to the 6" with more DS.

 

[machsnell]

Quote is low compared to what I paid. Gutter was thin as hell. I paid 2300 for 190 feet of 6 inch and 5 downspouts.

For the rest of the house which was 250 feet I paid a company to come out and make the gutters and give me down spout and brackets and connections and ds inserts. I got the .032 metal instead of the standard .027 metal my original guy used.

The 027 is so thin the ladder has to be almost vertical so it doesnt dent it when I go clean the gutters.

I had one of my employees who use to do gutters install with me and saved from the 3500 quote to remove and redo gutters.

I definitely wouldnt have messed w it if were under 2000. Took is a day amd a half to remove and install new but my fascia is at an angle and needed wedges in back to level gutters

Sent from my SM-G960U using Tapatalk

 

[Mark price]

I own a gutter business. Do a 6” gutter and 1 3x4 spout per side is what I would do. If you see that the one spout can’t handle the water you can always add another. As far as price it all depends on where you’re located. Around here is prolly the cheapest in the country and would run you about $750

 

[toolmiser]

Make sure you get the larger of the two sizes of downspouts, other than looks I see no downside in too much downspout.

 

[jpcjguy]

Thanks for the feedback everyone. So my price is kinda high, but not outrageous.....
I wonder if the color adds some....

 

[rlitman]

It looks to me like the ground slopes down to the right. If you have a downspout on the left, the ground runoff will go across the driveway anyway. May as well catch it and send it down hill in one shot.

 

[kbs2244]

You need a commercial contractor

Go with the biggest gutters and down spouts you can get
Ask about 8 inch
He may have to get wider supply roll but is a one time job for you so get it right

48 x 30 I a lot of roof and your pitch will have it coming down fast.
Going over sized overall will let you have one down spout on the right side
Be shure the supports can take the load

I would guess he is just going to paint the stuff to match while it is still on the ground

 

[jpcjguy]

rlitman - you are correct in that the ground does slope to the right. If I have a gutter on the left side, I would run a pipe under the gravel (why I have not finished the parking area yet) to the join up with the drain pipe on the right side.

kbs2244 - interesting thought - nobody has mentioned going that big yet. As for painting - no way! That only means I would have to touch up later. I would have them use a coil stock that color matches (or gets close)

 

[Innovate1]

8" seems like way overkill but this IS GJ... If the gutters were on the short sides maybe but you have 50' of gutter on each side. One downspout per 30' rule of thumb ignores local conditions. Somewhere on line recently I found some info on gutter sizing. There are tons of them so you may want to check a couple of them to compare results. Here is one for commercial but the tables go down to 6" gutters and 3 x 4 down spouts which is what I would use.
https://www.saf.com/perimeter-systems/cornice_gutter_products/commercial-gutter-systems-downspouts/sizing-guide/

I had some data that used the 5 minute peak rainfall but couldn't find it again. Here is some historical data though.

https://naldc.nal.usda.gov/download/CAT87205951/PDF

 

[CraigStu]

Even w/ the usual 5in gutter you can use the larger downspout. Just turn it 90 degrees. Another technique I found when I got tired of clogged spouts is I don't use any of the elbows except at the very bottom. That double elbow right below the gutter is always where the spout clogs. The first 8ft section of spout below the gutter is a straight shot to the side of the house. The angle is slight enough that you can fudge the joint to the next piece.

 

[slowtwitch73]

If the grade, etc allows, get downspouts on both ends and high center the gutter... the best way. I recommend the heavy wall steel gutters also.

 

[Falcon67]

If the grade, etc allows, get downspouts on both ends and high center the gutter... the best way. I recommend the heavy wall steel gutters also.

Or just run it over the big doors and forget the rest. I'm about to rip 50% of the gutter off my shop, all them SOBs do is leak and leak right in front of the overhead door.

 

[GTO]

Leaders,you are talking about leaders.
Yes go with one on each end.

 

[jpcjguy]

Thanks for the feedback everyone! So onto the next phase of gutter PITA!

Since the ground slopes to the right, that is the direct of the underground drain pipe.
I was recommended to use 4" ADS double wall pipe in 20' sticks since it is going to be under the driveway/parking area. That pipe needs to be 12" underground (according to specs)
I measure from the left downspout (at ground level) to where I thought was reasonable for the pipe to finish and exit into daylight. The run is 75'. I did a string line level and the drop is 32". Based on a 1/8" slope per foot - over 75', I need only a drop of 9 3/8".
Now I have not taken into account that I need to bury the pipe at the start point (I was measuring at ground level). So if we drop the start point 10", I still have 22".
I think I am fine on slope - since there is no solids (Poop), too much slope should not really be an issue.
The only issue I see is that in order to be 12" below the surface where a vehicle will be "at the highest ground level" is in and out of the left bay, that will dictate my starting point. See the attached crude drawing (the brown line kind of shows how the ground slopes away from the garage).
To the left of the 12" point (red line) will be to the downspout - maintain a reasonable slope to 8-10" underground (no heavy traffic here - just foot). Then to the right of the 12" point (red line) - also maintain a reasonable slope to the exit to daylight.

So how is my logic? Am I missing something?

 

[kbs2244]

The min bury depth spec is for crush resistance.

Although I have over 70 feet of buried gutter drain pipe I do not like it.
Leaf clogs would be a nightmare.
I double screen my pipe system before the water goes underground

 

[macdabs]

I have a large roof ranch house . Just went through the gutter waste water issue in the fall . Best think I did was run schedule 35 6” SDR for the downspouts . Then exit all your pipes into a concrete street drain basin with a steel grate. Something like 3’x 3’. It will run you around $300-400.00 . You can place it in your low spot to catch any run off from Your driveway apron. Then exit with 10” drainage pipe. This will give you a clean out if needed and keep the animals out. I terminated my French drains also into the basin. Now when it rains I can keep an eye on my drainage just by looking through the grate . Then 20 years from now you will know where everything exits to.

 

[jkeyser14]

I have 6" with two gutters per side. I highly recommend it. Most leaves pass through the 3x4 downspouts and if the gutters do get clogged, it is normally only on one side and then it's not a rush to clean it.

 

[Hivolts]

Just did my house. 240 ft, 6 inch, 12 downspouts for $2K. Looking at your roof pic, I'd go with 2 on each side.

 

[jpcjguy]

I got another quote from the company my contractor recommended - finally got on their schedule - wow! $550 for 4 downspouts and 6" gutter! But....this was for .027 thickness not .032 - but I talked to the guy and he seemed to think the upgrade would be minimal, if anything. He will let me know today. Much better price - so I asked my contractor again on what the "catch" was and he said that he has been using them for 25 years and had no issues with quality of product or install. As long the price does not skyrocket, I think I know who I am going with!

 

[Hot shot]

Jpcjguy
If you don’t mind me asking what company gave you that price
I want to get some on my garage

 

[jpcjguy]

Jpcjguy
If you don’t mind me asking what company gave you that price
I want to get some on my garage

PM sent

 

[slowtwitch73]

Double ended down spouts are the way to go, site allowing. Leaves etc, even if they don't clog the downspout, will often pile up at the lip to the down spout and slow the travel of water.. not a big deal if it never freezes, but if you are going through freeze thaw cycles, you want as much of the water to drain out asap daily before it freezes at night. Any ice that forms takes that much longer to thaw the next day, and any water coming off the roof is slowed that much more so you get accrued ice build up and decreased water flow day by day.
Then the grade of the gutter goes to pot and or it buckles somewhere in the middle, etc etc.