Looking at some deep SS rain gutter replacement for large roof catchment area.

Normal sized gutter overflows every wet season at the patio area.

Have tilted the gutter angle already.

I have seen picture of the guttering somewhere but can't remember where.

Thanks

Better to go a "Guttering shop'. They will come to your home with their materials and install the guttering the same day. They will charge by the meter, and with SS could be be in the range of 800 baht.

Yes, we have one place that maybe manufactures guttering, but I don't think they install it. I wanted to take a picture of this deep SS guttering to them and see if they can make it. Not standard around here.

Whatever you do, make the downspouts bigger and or more frequent.

Regardless of the volume of the gutter, if the drain(s) can't keep up it will overflow.

Best to find a shop that roll-forms the gutters on-site to eliminate unnecessary seams.

TMS Rollform may be able to put you in contact with someone in your area.

On 4/18/2026 at 8:37 AM, carlyai said:

Have tilted the gutter angle already.

So that's lowered one end slightly, so that is where it over flows?

Send a message to forum member Bandersnatch.

He had big stainless gutters made for his place.

A Self Sufficient Home

55 minutes ago, Yellowtail said:

Whatever you do, make the downspouts bigger and or more frequent.

Regardless of the volume of the gutter, if the drain(s) can't keep up it will overflow.

Best to find a shop that roll-forms the gutters on-site to eliminate unnecessary seams.

TMS Rollform may be able to put you in contact with someone in your area.

Yes will increase the downpipe size as well. :)

39 minutes ago, VocalNeal said:

So that's lowered one end slightly, so that is where it over flows?

Yes and no. When we have medium downpour the lowering of the gutter can handle it, but big downpours it overflows everywhere.

We used to get an overflow during really heavy storms until SWMBO got a local guy in and he found some bits and pieces in the downflow pipe!

Might be worth a try?

1 minute ago, VocalNeal said:

We used to get an overflow until SWMBO got a local guy in and he found some bits and pieces on the downflow pipe!

Might be worth a try?

Indeed, great idea. My dad used to have us on a ladder running the hosepipe down through the downspouts.

Thinking about it, we had great gutters. All galvanized and soldered seems, still working fine when they were 60 years old.

14 hours ago, VocalNeal said:

We used to get an overflow during really heavy storms until SWMBO got a local guy in and he found some bits and pieces in the downflow pipe!

Might be worth a try?

No it's just the volume of water in the roof valley.

Anyway, starting on making the downpipes larger.

One of our local builders' merchants has this display, it is about 6 inches deep, the length of my mobile phone.

I looked into it a while ago, you can get everything straight pipes, elbows, etc.

Or, we had a new roof fitted a while ago, the metal sheets, the shop buys in rolls of sheeting and puts them through formers to make the sheets.

On the other side of the shop, he was doing the same with gutters. We have them fitted they come in 10-meter lengths, good quality steel as well.

Our gutters have a good fall, but it sounds to me if the fall could be a problem. Keeping them clean is the biggest problem, they are full of leaves, never had an overflow problem, when they are clean, the outlet hole is 3inches

Have decided to increase the downpipe size first. :)

Thanks.

Is it fixed yet?

SWMBO (always), took over and outsourced it to someone recommended by the fabricating factory.

Gave her a price of B7000 for 6 or 9" downpipe only to replace the existing 5 downpipes.

Haven't seen him yet.

I was going to get a couple of my local farmers to have a look as well, but too late for that.

Waiting. :)

C'est la vie

16 hours ago, carlyai said:

SWMBO (always), took over and outsourced it to someone recommended by the fabricating factory.

Gave her a price of B7000 for 6 or 9" downpipe only to replace the existing 5 downpipes.

Haven't seen him yet.

I was going to get a couple of my local farmers to have a look as well, but too late for that.

Waiting. :)

Using 6 or 9" down pipes is a bit over the top and expensive 4" is plenty.

And how are they going to join a 6-9" pipe to your existing outlet? just by using reducers? if so that will just put you back to square one, still going to have a bottleneck at the outlet.

Still say try to increase the fall of the gutters.

My gutters are 6" and my down pipes 3.5" and never get overflow, but my gutters are probably installed correctly, with a downpipe on every corner.

The longest length is 19 meters, and the highest point of the gutter is in the middle, so it slopes to both ends.

I also have a downpipe right under every roof valley.

Edited May 8May 8 by CallumWK

We have something like 4 inch down pipes every 3 meters or so on a place that is 12 meters long. Never get any overflow. SS, was cheap and done onsite in perhaps half a day.

Sweep them out and spray them with lacquer from a spray can, 79 baht in the normal places, before and after each rainy season.

The 2 downpipes are on the left and right sides.

I built the house, then the pool and coverd area over the pool and tiled area.

I made a mistake by not installing a downpipe on the roof valley as we sit in that area.

I have larger underground pipes that take the rainwater to the road drains, so I can increase the size of the downpipes.

I have already increased the angle of that gutter and will increase the angle of the other gutter as well.

So plan A is to increase the size of the downpipes and if that doesn't do the job, install larger guttering and if that doesn't do the job install a downpipe at the main roof valley, take up the tiles and cut a channel in the concrete to the underground waste water pipes.

I hope that explains it.

If you don't swim in the rain it would be simple to drill a hole in the roof valley and instal a "decorative" rain chain? Unless of course you sit under the valley.

Removed tiles very rarely look good when reinstalled?

9 minutes ago, VocalNeal said:

If you don't swim in the rain it would be simple to drill a hole in the roof valley and instal a "decorative" rain chain? Unless of course you sit under the valley.

Removed tiles very rarely look good when reinstalled?

We don't sit under the valley, because that's where the overflow is when lots of rain.

Has to be lots of rain and pool rises about 1 to 2", otherwise all OK. All was OK until I built the roof over the shallow end pool area, before we layed the tiles.

Anyway see what the new downpipes do.