Low angle roof.

[overherebc]

Two roofs that come together, one at about 45 degrees feeds rain onto one at about 25 degrees.

When it's really heavy rain with the wind in the wrong direction it can feed water under the tiles on the low angle roof. ( 30 sq mts of low angle roof )

Changing the angle would take too long and too much $$$.

Has anyone ever used spray on whatever in a similar situation?

[cheeryble]

If you want help we need detail.

 

Roof material for a start.

How far the upper roof overlaps the lower, and any material supposed to be weatherproofing?

Photo(s)?

Edited October 7, 2017 by cheeryble

[overherebc]

45 minutes ago, cheeryble said:

If you want help we need detail.

 

Roof material for a start.

How far the upper roof overlaps the lower, and any material supposed to be weatherproofing?

Photo(s)?

Standard roof tiles. About half tile overlap where they meet.

Edited October 7, 2017 by overherebc

[overherebc]

I've considered buying 6×4×4mm clear perspex or stiff plastic sheets and fixing over the tiles.

[cheeryble]

46 minutes ago, overherebc said:

Standard roof tiles.

Briefly for now.....

 

Looks like the lower roof has itself previously been leaking so they've mortared (some of) the tiles together.

This may or may not mean there's mortar under the bottom row of the upper roof, because one way or another you may need to lift them.

 

I was thinking you may be able to run a roll of material (in a perfect world lead, probably zinc) tucked up under the lower row on the upper roof then beaten to the shape of the lower roof .

As it is I'd first ensure i knew where the water is coming from (as it's likely been previously leaking), and ensure it's the join between the two angles which is at fault.

i.e. are there leaks all along the join or a few places or could it be leaking just through the lower roof?

If the leak is from the join between the angles check if you can lift the bottom row(s) of upper roof tiles to tuck something under.

Then you have the option of some sort of flashing.

You have no option of putting a large waterproof membrane under the tiles on the whole lower roof and tucked into the upper as you cannot lift off the lower roof tiles.......unless you can replace them.

If the leaks are only just above the join line maybe you could do a horrible bodge job and mortar along it.

 

The other options are ......if the tiles are replaceable......retiling the lower roof and getting something tucked under the upper. In fact consider a different lower roof material.

 

ps I've done some lead work but not sure how well zinc can be formed to the shape of the tiles.

Very wide flash band may do as fishing think they go up to 300mm wide in UK don't know about here or the cost.

I know narrow rolls are available so maybe wide.

It will adapt to shape very well if warmed up in the sun or a hair dryer.

 

Dare I mention the final solution......a new roof......depends on your circumstances.

It may be an option to replace just the lower roof with another material and have a proper membrane underneath and proper flashing at the join.

The lesson being don't use these tiles on such a low angle.

Edited October 7, 2017 by cheeryble

[overherebc]

I've also considered a spray job from one of the companies that do insulation inside as some offer an on top system for flat roofs they claim is water proof. 

The leaks only really happen when it's extremely heavy rain and strong wind and not along where the roofs join, here and there describes it.

[cheeryble]

Cannot speak as to someone's spray job.

 

If you can get the join sealed right (Colorbond might make a form for this) I'd consider an insulated Colorbond metal roof for the whole lower.

Depends on the aesthetics and also if you can get enough sound insulation if e.g. its above a bedroom.

Your rafters etc are already there......it wouldn't be so expensive.

Edited October 7, 2017 by cheeryble

[Pdaz]

33 minutes ago, overherebc said:

I've also considered a spray job from one of the companies that do insulation inside as some offer an on top system for flat roofs they claim is water proof. 

The leaks only really happen when it's extremely heavy rain and strong wind and not along where the roofs join, here and there describes it.

My house has a low pitch Mediterranean style roof and we had a similar problem at one end if the rain was very heavy and the wind strong enough. 

Spray foam isulation ( from Lohr Pattaya ) solved the issue. Roof is now completely sealed and solid.  The company was quick, efficient and decent value.

[cheeryble]

9 minutes ago, Pdaz said:

My house has a low pitch Mediterranean style roof and we had a similar problem at one end if the rain was very heavy and the wind strong enough. 

Spray foam isulation ( from Lohr Pattaya ) solved the issue. Roof is now completely sealed and solid.  The company was quick, efficient and decent value.

 

I'd hate to be the poor sod who has to spray inside that low sweltering roof space.......

[Pdaz]

Just now, cheeryble said:

 

I'd hate to be the poor sod who has to spray inside that low sweltering roof space.......

They remove a few of the tiles above the ervice hatch to vent the space and provide light. Once the majority has been done they replace them and spray the remaining area. They been doing it a long time and have found the bet method. 

Not usually a fan of Thai "technicians" but this mob knew their job.

[overherebc]

15 minutes ago, Pdaz said:

My house has a low pitch Mediterranean style roof and we had a similar problem at one end if the rain was very heavy and the wind strong enough. 

Spray foam isulation ( from Lohr Pattaya ) solved the issue. Roof is now completely sealed and solid.  The company was quick, efficient and decent value.

It's above the kitchen and there is only 5 or 6 inches between the tiles and ceiling so difficult to do I reckon.

[Pdaz]

4 minutes ago, overherebc said:

It's above the kitchen and there is only 5 or 6 inches between the tiles and ceiling so difficult to do I reckon.

Doesn't cost anything to have them check it out. They r happy to come survey the job and say if is possible. I was surprised they could access all of my roofspace but they managed.

[overherebc]

This would be perfect but doubt if it is available in Thailand.

[cheeryble]

2 hours ago, overherebc said:

This would be perfect but doubt if it is available in Thailand.

Actually fake tiling is available in metal,

second thoughts it may be the smaller cementitious panels.

anyone?

 

whatever it is you must be sure the angle is suitable.

this is where colorbond type metal roofing is good, the angle can be veryy shallow indeed

 

Edited October 7, 2017 by cheeryble

[overherebc]

7 minutes ago, cheeryble said:

Actually fake tiling is available in metal,

second thoughts it may be the smaller cementitious panels.

anyone?

 

whatever it is you must be sure the angle is suitable.

this is where colorbond type metal roofing is good, the angle can be veryy shallow indeed

 

I might end up going for covering wth panels and stick down with silicone adhesive.

Red ones similar to photo.

[cheeryble]

IMHO it's better aesthetically to have a decided change at a join rather than do a fake job that is close but obviously not the same.

The other thing this faux tiling likely only comes in standard size panels, whereas metal roof as in your first four pictures comes off a continuous roll and is cut to size....ie no joins to leak.

They have a machine which can put a curve that normally goes downwards at the bottom of the roof so rain falls off the roof vertically. I think this curve is adjustable. Maybe it could be reduced to the angle between your two roofs, then tuck under. If not you've got a much easier seal at the join anyway.

Edited October 7, 2017 by cheeryble