roof sealer products

[Mr-Zedd]

I have multiple leaks in my tiled roof which show up during heavy rains. (photo attached)

The developer has been here to "try" and fix it, but his solution was to patch the hole(s) from the inside. So, the water simply took a different route and now drips somewhere else inside the roof.

I am thinking of buying some roof sealer to paint it on between the tile edges to seal the area against leaks. I would hire a roofer guy to apply the sealer.

Not knowing how many more leaks I may get I was thinking about sealing the entire roof.

Went to Home Pro today and found 4 products that claim will do the job. Each pail was about 4.5 kg.
1) Bosny B101 (cost 580B)
2) Sista D100 (cost 800B)
3) Lanko #451 (cost 880B)
4) Sika Roof Seal (cost 1150B)

The prices vary a lot so I was wondering if anyone has used any of these mentioned products and had success (or not) of the product in question. Did it go on thick or was it watery thin? Were two coats needed? Does it have durability against UV? etc...

Also, does anyone know where I could buy a "bulk" amount of the item I finally decide on, the largest I found at Home Pro was 5kg and I estimate that will only be enough for many 150-200 tiles.

I read on one of the postings here a store close to Cha am, Thai Watsadu. Does anyone know if they carry roofing sealer as well, maybe in larger quantities?

If someone else came up with a more effective solution I am open to that as well. I figured it needs to be sealed from the top so this might be the best way to go.

Thanks for any info you can provide.

[Dannie Boy]

I have multiple leaks in my tiled roof which show up during heavy rains. (photo attached)

The developer has been here to "try" and fix it, but his solution was to patch the hole(s) from the inside. So, the water simply took a different route and now drips somewhere else inside the roof.

I am thinking of buying some roof sealer to paint it on between the tile edges to seal the area against leaks. I would hire a roofer guy to apply the sealer.

Not knowing how many more leaks I may get I was thinking about sealing the entire roof.

Went to Home Pro today and found 4 products that claim will do the job. Each pail was about 4.5 kg.
1) Bosny B101 (cost 580B)
2) Sista D100 (cost 800B)
3) Lanko #451 (cost 880B)
4) Sika Roof Seal (cost 1150B)

The prices vary a lot so I was wondering if anyone has used any of these mentioned products and had success (or not) of the product in question. Did it go on thick or was it watery thin? Were two coats needed? Does it have durability against UV? etc...

Also, does anyone know where I could buy a "bulk" amount of the item I finally decide on, the largest I found at Home Pro was 5kg and I estimate that will only be enough for many 150-200 tiles.

I read on one of the postings here a store close to Cha am, Thai Watsadu. Does anyone know if they carry roofing sealer as well, maybe in larger quantities?

If someone else came up with a more effective solution I am open to that as well. I figured it needs to be sealed from the top so this might be the best way to go.

Thanks for any info you can provide.

It sounds a big job and might be better to approach a roofing "expert" and ask his opinion? But to answer your question, I am fairly certain that Thai Watsadu would carry a range of products in bigger quantities than Home Pro.

[deepee]

Mr-Zedd,
from what I can see from your photo the ridge and end cappings appear to have been patched up already.If your leaks are from the cappings it might be worth ripping the whole lot of them up and replacing them back with new bonding right thru.The tiles themselves appear to be sitting well.Has anyone managed to get a good look at the underside of the roof during downpours?

[STEVE G]

Also, does anyone know where I could buy a "bulk" amount of the item I finally decide on,....

About 10 km down the Hin Lek Fai road, on the right opposite a Wat there is a place that deals in all types of paints and coatings that seems to sell everything in 25 litre drums. I don't know that they specifically have roof sealant but they have a large range of stuff and might be worth a try.

[johnnyk]

I did roof repairs last winter on about 21-22 broken/chipped/shifted tiles. Some had shifted a little bit but that's a lot when the rain is driven by strong winds.
The fellow and I checked from inside to see where light shone through then bunged them with cement from outside. I painted over the cement with a white sealer, don't recall the name but I got it at Home Pro and I think it was a euro brand (but not Sika). It dries to a plastic-y finish.
The stuff is quite thin because it's applied with a brush so it's ok for small cracks or sealing over as I did. I tried it on a larger opening about 1/2" wide but it just sagged/drooped and does not seal it closed.

[Mr-Zedd]

Hello everyone,

Dannie Boy
- yes we are having a roofing guy come over in the next few days to take a look and give us his assessment, the plan of roof sealing was only my first idea.

deepee
- the leaks are in the middle of the living room and bedroom ceilings so unless the water is traveling along the roof before coming down I dont think its from the cappings
I will wait for the roofing guy to look at them to decide if they need to be replaced

STEVE G
- I will see if I can find that place, thanks.

johnnyk
- good idea about the light shining from inside. yes I think your point about only being able to seal smaller thin cracks is noteworthy, since many of the gaps on the roof are much larger than a thin line the sealing idea may not be as effective as hoped

I will take a drive up to the Thai Watsadu place and see what they have so when the roofing guy comes by I know where to buy whatever I plan to use.

Thanks for your input!

[Takiap]

Quite often you'll find the leak isn't directly above the area getting wet. When our place was first finished, we had two leaks, and after going into the roof space, I discovered that the water was getting and running down the inside of the roof before dripping onto the ceiling boards. We mentioned this to the builder and he just sent one of his workers up onto the roof with some cement in a bucket to patch the problem areas. Problem was solved there and then.

[Farang]

On roof leakage in Thailand the first thing to do is to check the valley flashings on the roof. These should be checked at least once a year and more often if there are large trees growing nearby and much fallen leaves on the ground. So check and clean the valley flashings first, if they are clean and even the heavy rain water flows freely, then you’ll need a roofing inspection.

Every Thai villa – every one of them - I’ve seen has the same roofing mistake: the valley flashings on the roof are covered, not open. Roofing tiles – be they of concrete, ceramic or asbestos – are slant-cut to meet above the valley flashing so that they cover the actual valley gutter. Under this cover debris such as leaves and twigs collect over the time until they form a stoppage for free water flow.
During heavy rain the water in the valley flashing flows round the stoppage running down on the ceiling and into room space below. More often than not the water flows above the ceiling before dripping into the room. Consequently the actual room leakage need not be directly under the valley flashing.



The valley flashing tends to be blocked even when it is semi-open and in a steep roof, let alone in typical Thai villa gently sloping roof.



Therefore all the valley flashings on the roof should be open. They are easily inspected and are self-cleaning.




So check and clean you flashing first.

[crazy88]

Those ridge tiles are designed to be used with a dry fix system whereby they are screwed to metal runners with a flashing skirt. Brand model is Prestige. They have them at Homemart in Cha Am with a display stand showing how they should be fixed in place. Might be worth a visit as they install them as well.

Crazy 88

[JimmyGreaves]

Those ridge tiles are designed to be used with a dry fix system whereby they are screwed to metal runners with a flashing skirt. Brand model is Prestige. They have them at Homemart in Cha Am with a display stand showing how they should be fixed in place. Might be worth a visit as they install them as well.

Crazy 88

Agree - Yes, looks like they have not been fitted correctly as crazy says they are Prestige dry fix tiles.

[Mr-Zedd]

Farang
- still waiting for the roofing guy to show up, but will take a look at the flashings when we go up there.

we dont have any large trees nearby and I cant see any leaf/tree debris on the roof tiles at all

thanks for the info

[poosmate]

As you have been advised already the ridge and hip tiles need removing ( some may break so buy some spares) and refitting with a dry fix product. I have had experience of persistent leaks and tried different products. The fault usually lies either in too much mortar being used, the roof is to steep or the top edge is too wide.
For all the above faults replacing the mortar with a dry fit method has been successful for me.