I have a Monier cement tiled roof. I am getting staining in my eave lining.

With torrential rain this shallow gutter just cannot cope and overflows into the roof space. The other issue are dead leaves blown from surrounding large trees which block the Valley even though the cut tiles are fairly close together.
My question, is there some way i can seal the Valley so the rain runs over the top and the leaves don't compact under the roof tiles in the Valley.
Here is a photo of the main problem Valley. As you can see it is a long Valley. (i had thought of inserting a gutter under the tiles at half distance).

I have placed a 50cm wide metal strip under the first two rows of tiles, to no effect.
Thank you for any constructive advice.

2 minutes ago, tandor said:

I have a Monier cement tiled roof. I am getting staining in my eave lining.

With torrential rain this shallow gutter just cannot cope and overflows into the roof space. The other issue are dead leaves blown from surrounding large trees which block the Valley even though the cut tiles are fairly close together.
My question, is there some way i can seal the Valley so the rain runs over the top and the leaves don't compact under the roof tiles in the Valley.
Here is a photo of the main problem Valley. As you can see it is a long Valley. (i had thought of inserting a gutter under the tiles at half distance).

I have placed a 50cm wide metal strip under the first two rows of tiles, to no effect.
Thank you for any constructive advice.

I have multiple valley like you have, when the house was built gutters were installed under the valleys, nine years, never a problem

Unfortunately I had the same problem. The valley metal gutter was too small.

Made a bigger wider gutter at the local shop (metal shaped like an airplane glider frame).

Took off the tiles around the valley, installed the new gutter, replaced the tiles, all good.

I don't think there's an easy fix that will last except a wider, deeper gutter.

 

5 hours ago, carlyai said:

Unfortunately I had the same problem. The valley metal gutter was too small.

Made a bigger wider gutter at the local shop (metal shaped like an airplane glider frame).

Took off the tiles around the valley, installed the new gutter, replaced the tiles, all good.

I don't think there's an easy fix that will last except a wider, deeper gutter.

 

yes the valley is vey shallow. Did you have to modify the roof frame (underlayment) or just replaced the gutter with a deeper one; if so do you recall how deep?

I think i will lay a long strip of fine meshed stainless steel wire over the top of the valley and tuck it under the tiles to secure it; the whole length of the valley

Thanks for your reply.

7 hours ago, flexomike said:

I have multiple valley like you have, when the house was built gutters were installed under the valleys, nine years, never a problem

Thanks. Yes i too have Valley gutters, but they are quite shallow and really should have been much deeper.

I think i will lay a strip of fine meshed stainless steel wire over the top of the tiles and tuck it under the tiles to secure it.

5 minutes ago, tandor said:

Thanks. Yes i too have Valley gutters, but they are quite shallow and really should have been much deeper.

I think i will lay a strip of fine meshed stainless steel wire over the top of the tiles and tuck it under the tiles to secure it.

Will the fine mesh be leakproof?

3 minutes ago, Lacessit said:

Will the fine mesh be leakproof?

No..only to stop the leaves building up and clogging up the valley gutter. (I will lay the mesh over the top of the roof..worth a try).

1 minute ago, tandor said:

No..only to stop the leaves building up and clogging up the valley gutter. (I will lay the mesh over the top of the roof..worth a try).

There are plastic leaf guard products on Lazada.

 

I daresay they would be considerably cheaper than stainless steel.

12 minutes ago, Lacessit said:

There are plastic leaf guard products on Lazada.

 

I daresay they would be considerably cheaper than stainless steel.

I already have a roll of mesh, but i will suss out the plastic leaf guards..thanks.

1 hour ago, tandor said:

yes the valley is vey shallow. Did you have to modify the roof frame (underlayment) or just replaced the gutter with a deeper one; if so do you recall how deep?

I think i will lay a long strip of fine meshed stainless steel wire over the top of the valley and tuck it under the tiles to secure it; the whole length of the valley

Thanks for your reply.

From memory just moved the tiles. Big job but guy knew what he was doing so just 1 day.

8 hours ago, tandor said:

I have a Monier cement tiled roof. I am getting staining in my eave lining.

With torrential rain this shallow gutter just cannot cope and overflows into the roof space. The other issue are dead leaves blown from surrounding large trees which block the Valley even though the cut tiles are fairly close together.
My question, is there some way i can seal the Valley so the rain runs over the top and the leaves don't compact under the roof tiles in the Valley.
Here is a photo of the main problem Valley. As you can see it is a long Valley. (i had thought of inserting a gutter under the tiles at half distance).

I have placed a 50cm wide metal strip under the first two rows of tiles, to no effect.
Thank you for any constructive advice.

 

Hi tandor- a 50cm wide metal strip under the valley - is it proper Valley guttering, or just a formed strip of metal ?

 

50cm is wider than a normal gutter, I think mine were around 40cm, from SCG, like in the included photo.

 

Your tiles leading into the trough need to be about 5cm apart, instead of nearly touching together.

 

That's why your Valley is leaking - there isn't a sufficient gap to deal with heavy rainfall, so it spreads out, resulting in ingress..

 

Don't cover or fill the valleys -

 

Chalk line a 2" gap, centred  above the metal trough, and get a light weight thai labourer to angle grind the tiles all the way from top to bottom.

25 minutes ago, carlyai said:

From memory just moved the tiles. Big job but guy knew what he was doing so just 1 day.

a family relative buily my house but the roof was subbed out, ican't complain as my responsibility to clean the valleys and gutters which i do each year but the small elongated Monkeypod tree leaves break down and compat inside the gaps between the tiles and the metal valley gutter..couldn't see it happening until too late, and with these rain storms it all happens.

Thanks again for your input and i daresay that is the only solution.

31 minutes ago, Pla Simon said:

 

Hi tandor- a 50cm wide metal strip under the valley - is it proper Valley guttering, or just a formed strip of metal ?

 

50cm is wider than a normal gutter, I think mine were around 40cm, from SCG, like in the included photo.

 

Your tiles leading into the trough need to be about 5cm apart, instead of nearly touching together.

 

That's why your Valley is leaking - there isn't a sufficient gap to deal with heavy rainfall, so it spreads out, resulting in ingress..

 

Don't cover or fill the valleys -

 

Chalk line a 2" gap, centred  above the metal trough, and get a light weight thai labourer to angle grind the tiles all the way from top to bottom.

Thnx..i put the 50cm steel  sheet horizontally under th4e edges of the first two rows of the tiles wrongly thinking the water was backing up from the flattish surface the roof discharges onto. 

Re the the Valley gutter, it was filling up with small leaves which were rotting down, compacting and over time blocking the Valley gutter.

I will try opening the gap a little and try this fine mesh over the top, if that doesn't fix the issue i will modify the Valley Gutter as suggested by @carlyai. Thanks for the advice.

 

20 minutes ago, tandor said:

Thnx..i put the 50cm steel  sheet horizontally under th4e edges of the first two rows of the tiles wrongly thinking the water was backing up from the flattish surface the roof discharges onto. 

Re the the Valley gutter, it was filling up with small leaves which were rotting down, compacting and over time blocking the Valley gutter.

I will try opening the gap a little and try this fine mesh over the top, if that doesn't fix the issue i will modify the Valley Gutter as suggested by @carlyai. Thanks for the advice.

 

You're welcome -

 

Any professional SCG builders merchants will give you free advice / consultation.

 

But for convenience, from Google :-

 

For a CPAC (SCG) Monier installation, the recommended metal valley tray width should be at least 15 cm with a 1 cm inward fold at each edge, and the tray should have a minimum depth of 5 cm. For the tiles themselves, you should cut them with a gap of approximately 3 cm left along the central dividing line of the valley. This creates a sufficient channel to direct water runoff and prevent leaks.
 

Valley Tray Requirements 

• Width: The metal valley tray should be a minimum of 15 cm wide.
• Depth: The tray should have a minimum depth of 5 cm.
• Edges: Fold the two wings of the tray inward by 1 cm at their edges.
•  
• Tile Installation in the Valley 

1. Mark the Cut Line:

Along the central dividing line of the valley, mark where the tiles will be cut.

 

2. Cut the Tiles:

Use a power saw to carefully cut the tiles along the marked line.

 

3. Create a Gap:

Leave an approximate 3 cm gap between the cut edges of the tiles along the valley's center.

 

4. Join Valley Troughs:

If you need to join sections of the valley trough, ensure they overlap by at least 10 cm and secure them with silicone or solder to prevent leaks.

 

I built my own house, and tiled my own roof - monier roof tiles and fittings all SCG, but used a 5cm gap over the valley troughs- never had a leak, never had to clean out the valleys - rainfall clears debris naturally - I have 7 valleys, the longest are around 10m.

 

The valley trays i used were the larger size, from SCG.

 

I have fixed and renewed a number of roofs here in Thailand.

 

Your valley tiles are cut too close together, 100%.

 

Goodluck !

1 hour ago, Pla Simon said:

 

 

You're welcome -

 

Any professional SCG builders merchants will give you free advice / consultation.

 

But for convenience, from Google :-

 

For a CPAC (SCG) Monier installation, the recommended metal valley tray width should be at least 15 cm with a 1 cm inward fold at each edge, and the tray should have a minimum depth of 5 cm. For the tiles themselves, you should cut them with a gap of approximately 3 cm left along the central dividing line of the valley. This creates a sufficient channel to direct water runoff and prevent leaks.
 

Valley Tray Requirements 

• Width: The metal valley tray should be a minimum of 15 cm wide.
• Depth: The tray should have a minimum depth of 5 cm.
• Edges: Fold the two wings of the tray inward by 1 cm at their edges.
•  
• Tile Installation in the Valley 

1. Mark the Cut Line:

Along the central dividing line of the valley, mark where the tiles will be cut.

 

2. Cut the Tiles:

Use a power saw to carefully cut the tiles along the marked line.

 

3. Create a Gap:

Leave an approximate 3 cm gap between the cut edges of the tiles along the valley's center.

 

4. Join Valley Troughs:

If you need to join sections of the valley trough, ensure they overlap by at least 10 cm and secure them with silicone or solder to prevent leaks.

 

I built my own house, and tiled my own roof - monier roof tiles and fittings all SCG, but used a 5cm gap over the valley troughs- never had a leak, never had to clean out the valleys - rainfall clears debris naturally - I have 7 valleys, the longest are around 10m.

 

The valley trays i used were the larger size, from SCG.

 

I have fixed and renewed a number of roofs here in Thailand.

 

Your valley tiles are cut too close together, 100%.

 

Goodluck !

Thanks for all that. Im sure my Valley troughs are  the correct size, going by my visual estimation. The house is now 10yrs old and through lack of cleaning out the troughs thoroughly (one would think small oval leaves would simply be flushed away); however over the years a lot of these leaves rotted and formed clumps which accumulated under the cut tiles on either side of the trough. The troughs appeared clean/clear. Over time these blockages could not cope with the torrntial downpours we experience and the storm water overflowed at these points and dripped/splashed onto the eave lining below.

I now have a few good ideas to pursue thanks to you people.

Thankyou everyone.