It appears my roofing guy has went on a bender so I will attempt this job on my own.

 

A few years ago I had an extension built onto the side of house, it appears they used standard silicone for the tile to cement area but now I am viewing water leaking on to the plaster board underneath. Can someone recommend a good sealant to use to fix this issue.

Pix good, if it were me I would reseal again and then cut slot in the concrete upstand with a small concrete cutting tool disc cutter as horizontally as possible, pump a good quality mastic into the cut line slot, put in a lead (best) or metal flashing and dress or fix it in positon.

Flashing it properly is the solution. There are a number of self-adhesive solutions if the wall surface is good.

 

10 minutes ago, Crossy said:

Flashing it properly is the solution. There are a number of self-adhesive solutions if the wall surface is good.

 

My guy that does the stainless steel work costs big bucks. There is not only this part this a long extension end to end. If sealant is not possible then perhaps I need to fork out for my stainless guy. 

 

The cement part is in good shape, is it possible to poke out the old sealant and fill with perhaps a two pack sealant.

 

I need some guidance on what sealant to use ? 

Stainless? Who mentioned stainless?

 

Flashing is lead, aluminium or a bitumen tape. Sika Multiseal is effective, permanent and available here.

 

https://www.sealantsandtoolsdirect.co.uk/manufacturers/sika/sika_multiseal_flashing_tape/sika_multiseal_sealing_flashing_tape_300mm_x_10m_skmulti300_P29243.html

 

10 minutes ago, Crossy said:

Stainless? Who mentioned stainless?

 

Flashing is lead, aluminium or a bitumen tape. Sika Multiseal is effective, permanent and available here.

 

https://www.sealantsandtoolsdirect.co.uk/manufacturers/sika/sika_multiseal_flashing_tape/sika_multiseal_sealing_flashing_tape_300mm_x_10m_skmulti300_P29243.html

 

You mention available here, any link to a Thai supplier or what its called here ?

 

Is there no adhesive I can use ?

 

 

It's called "Sika MultiSeal", I got it in MegaHome but all the big-box outlets should have it or something similar.

 

You could rip out the existing silicone and replace it with a water resistant silicone, but expect similar issues on a similar timescale.

5 minutes ago, Crossy said:

It's called "Sika MultiSeal", I got it in MegaHome but all the big-box outlets should have it or something similar.

 

You could rip out the existing silicone and replace it with a water resistant silicone, but expect similar issues on a similar timescale.

Ok thanks have located at Lazada.

 

Due to the contour of the tiles is this tape quite thin so it can be folded around the required shape.

 

I understand on a flat surface but this may be a fiddly job around this area trying to get a good seal from the tile to the concrete.

It's a bitumen based tape and is stretchy and flexible although it does require some practice to get a good fit. 

 

Try it on the less visible sections until you get it right.

https://www.homepro.co.th/homePro/th/สินค้าฮาร์ดแวร์-เคมีภัณฑ์ก่อสร้าง-เทปกาว/c/promo_mail3_homeimprovement_hardware_chemical_tape

All you need is the installation manual for the roofing tiles you are using. It will show how to make beautiful, waterproof seams. Below is an example (not your type of tile) to show the beautify of the fit and finish of fitting specialty flashing tiles. Note these are the last steps of a 17 step process; some of the earlier steps show the incredibly important and intricate steps of how to attach flashing tape correctly. If you want beautiful flashing that get complements and stays waterproof forever, follow the book. Otherwise just dream something up like the builder did and see what happens.

 

This stuff will do the job .... but far worse than silicon to use as it is very sticky ... remains slightly flexible ... sticks like shit to a blanket ...

Quote

I was given the following by a local roofing guy, about to leave my location for 1 month so better than leaving as is.

 

There are two basic approaches suggested in this thread.

 

Method 1 is to pack gunk between the tiles and wall like the builder did. This is unreliable for many reasons people probably aren't aware of and is the entire reason this thread was made. The gunk method is popular for novices, people who don't care how well it works, and those that wish to live their lives in ignorance, burning the knowledge even ancient builders solved perfectly already. Watching people reach for this gunk is like watching a caveman reach for a club. They'll just blame failures down the line on this or that, do it over again the same way, and never learn that they are wasting time and money and taking damage for something that looks bad and fails so easily. It's something a 6 year old would come up with.

 

Method 2 is to use flashing, preferring following the spec for the roofing tile to get the most beautiful fit and finish and meanwhile get a failsafe, step by step list of simple instructions intended just for you.

 

There's an old saying that fits here: you can lead a horse to water, but you can't make him drink. But look at the bright side, the big chemical companies will smile and love you.

 

You want to research an apron flashing and roman tiles. 

 

That is what you have. 

 

Lead flashing would be the longest lasting solution. I haven't seen it for sale in and around Khon Kaen. 

 

You could easily get a flashing made up in zinc alume from your local roofing supplier that would flash over the  joint in question. I haven't used the tape which @Crossy suggested but I do intend to as I have exactly the same issue as you in the house I live in except the builder used cement not silicon.

 

Shaemus 

22 hours ago, shaemus said:

You want to research an apron flashing and roman tiles. 

Wouldn't it be simpler to just follow the manual?

 

7 hours ago, canopy said:

Wouldn't it be simpler to just follow the manual?

 

Does he have the manual? 

 

I guess not. 

 

So the next step is to see what the internet provides. 

 

I believe the tiles are concrete cpac monier roman style. But I can't be 100%. 

 

What is your problem? 

On 6/20/2019 at 2:12 PM, shaemus said:

What is your problem? 

Don't be so touchy about people trying to be helpful. But thanks for mentioning the style because it took me less than a minute to find the manual online that would be perfect to hand to a builder. Wow, those edge tiles look great too. Look at that fit and finish in step 8. Perfectly hides the flashing in step 6.

 

 

4 hours ago, canopy said:

Don't be so touchy about people trying to be helpful. But thanks for mentioning the style because it took me less than a minute to find the manual online that would be perfect to hand to a builder. Wow, those edge tiles look great too. Look at that fit and finish in step 8. Perfectly hides the flashing in step 6.

 

 

Good work. 

 

Maybe you could share the link with the O.P or attach the pdf / or link here for people reading in the future. 

 

Those tiles are very common, I know them from Australia as they are sold there. 

 

Shaemus 

Thai builders are known to be unaware of edge tiles. They certainly skip these proper tiles on any "house contract" where the Thai builder incorporates the cost of roof tile in his price quote to build a home. The SCG roof design team at any Home Mart or the Diamond Roof Team at many other stores will graciously give you a complete list, based on real architect plans, of how many tiles, and what exact type of tiles, you should have bought for a proper roof.  Wall flashing done right the first time is money well spent in my experiences in Thailand. 

ADAMAS wall flashings.pdf