Leaking concrete tile roof

[NorthernBloke]

Hey everyone
Am after some thought and advice
I have a concrete tile low pitch (15’) roof , the roof hip beam is made of steel and it sits slightly proud of where it should be which means concrete tiles each side of it don’t sit too well as they approach the ridge , the ridges mortar in ok but I can see larger than usual gaps on the joins between the tiles each side on some tiles.
We live in an exposed areas and with wind driven rain or have rain in get a leak, I’ve had a roofer some and re-bed the ridges but it’s not solved the problem.
I’m not aware of any flashings or some such for under ridges and I’m scratching my head for the cheapest way to sort the issue once and for all.
Would appreciate any advice as we have just had the ceiling inside replastered again after the last leak and I’m tired of it all to be honest.
Thanks

 

[Wayners]

Take tiles off and look for water stains.
It's the only way.

Flat roofs there is a machine that sparks where there is a hole but nothing like that for a tiled roof unfortunately

 

[Alastairreid]

They could have doubled up the battens to clear the hip beam. (Possibly).

 

[NorthernBloke]

Yeah it’s easy to do that but being able to solve it is the problem !

 

[NorthernBloke]

Someone told me it’s possible to install a flashing under the ridges but I’ve never seen such a thing , lead etc … I’ve never seen lead flashings used like that and would be expensive on a 20m run

 

[Alastairreid]

Any pics?

 

[NorthernBloke]

Not very helpful as these were taken at dusk but I’ll post and do some more in daylight
His is about 15-16m long

 

[ree]

OP,
Do you know how the (presumably timber) hip jacks were fixed to the steel hip rafter?
Do you know if the roofing felt has been lapped over the hip rafter?
On occasion, we used something like Firestone Residential Gutter Liner or similar as a belt & braces precaution on awkward hips - but for you it would be a lot of hopeful work to drape a liner over the hip & any existing lapped hip felt.

I suspect the problem is that the hip rafter was not dropped when prepping the hip before installation?
Dropping hips (& valley rafters) is the common practice - typically using timber.
But I understand why steel was used for such a wide span and low pitch.

 

[noseall]

Someone told me it’s possible to install a flashing under the ridges but I’ve never seen such a thing , lead etc … I’ve never seen lead flashings used like that and would be expensive on a 20m run

20m run on a 15 degree pitch?

Max length rafter on a low pitch roof in exposed areas, is summat like 6m. You are fighting a losing battle there.

 

[martygturner]

see : https://www.manthorpebp.co.uk/roofi...d-dry-fix-roofing/roll-out-dry-fix-hip-6m-kit

 

[NorthernBloke]

20m run on a 15 degree pitch?

Max length rafter on a low pitch roof in exposed areas, is summat like 6m. You are fighting a losing battle there.

It’s a steel hip beam running down those ridges as per pics

 

[NorthernBloke]

OP,
Do you know how the (presumably timber) hip jacks were fixed to the steel hip rafter?
Do you know if the roofing felt has been lapped over the hip rafter?
On occasion, we used something like Firestone Residential Gutter Liner or similar as a belt & braces precaution on awkward hips - but for you it would be a lot of hopeful work to drape a liner over the hip & any existing lapped hip felt.

I suspect the problem is that the hip rafter was not dropped when prepping the hip before installation?
Dropping hips (& valley rafters) is the common practice - typically using timber.
But I understand why steel was used for such a wide span and low pitch.

I don’t know the answers to these I’m sorry as but I’ll ask the roofer
I’m wondering if we lift the ridges , raise the battens , redo felt and reseat the tiles and then redo the ridges to hopefully flatten out the tiles to seat better

 

[noseall]

It’s a steel hip beam running down those ridges as per pics

It's a poorly designed roof, in terms of pitch, rafter length and watershed. 15 degrees with that sized roof in an exposed area is ridiculous without mitigating factors built in.

 

[NorthernBloke]

It's a poorly designed roof, in terms of pitch, rafter length and watershed. 15 degrees with that sized roof in an exposed area is ridiculous without mitigating factors built in.

I get that , there isn’t much I can do know except figure out how to mitigate it
Again my roofer is saying he wants to lift the ridges and install lead flashing all the way down moulding it to the tiles and have it run out on the sides around 200mm and then re seat the ridges and point
I’ve never seen this done and I’m really not sure if it’s a good idea as that much lead will cost me a pretty penny

 

[noseall]

I get that , there isn’t much I can do know except figure out how to mitigate it
Again my roofer is saying he wants to lift the ridges and install lead flashing all the way down moulding it to the tiles and have it run out on the sides around 200mm and then re seat the ridges and point
I’ve never seen this done and I’m really not sure if it’s a good idea as that much lead will cost me a pretty penny

Your roofer or designer should be thinking about underlay, because the tiles are not designed for what you are asking them to do.