Double roman tiles spacing

[graann]

I am trying to fit some double roman roof tiles.
Two tiles interlocked together and the gap at the apex would be too large for a standard ridge tile approx 14 inches.
When I try to fit three tiles ,I have no problem getting the spacing correct so that the bottom two tiles have the same amount of tile showing but just do not fit smoothly as just two tiles.Is this normal or am I doing something wrong?

 

[vancleef]

Correct me if i'm wrong but are you trying to work with only two courses of tiles from gutter to ridge, then not having the second course not leading enough to the top for the correct amount of cover being allowed from ridge over tile, then trying to get the correct cover into the ridge by using a third course.

 

[graann]

That is correct.
Thanks for your quick reply.
I have been scratching my head all day.
When I use two tiles they interlock ok but unable to fit three tiles snugly due to constuction of tiles.

 

[vancleef]

What is the distance from your facia board to the furthest point of the apex because you have a minimum and a maximum gauge for the spacing of your tiling battens.

 

[graann]

836 mm from facia to apex.

 

[noseall]

836 mm from facia to apex.

Three courses of tiles.

 

[noseall]

You work on between 75 - 100mm head lap. You can fit the tiles with more lap if you wish, it's just that they will not work with plastic dry verge caps.

 

[graann]

Thanks again.
Are you saying I should be able to use 2 tiles or should I use three tiles with the dimensions I have given you of 836 mm ?
Will I have a problem interlocking the tiles with the method you suggest?

 

[noseall]

The tiles should fit snug.

If they don't, you either have no 'kick' on the fascia or you are trying to half bond them, which should not really affect them anyhow.

 

[graann]

Thanks again for your help.
Should I use two tiles or three tiles ?
Will be working on a solution tomorrow .

 

[noseall]

Three courses of tiles.

 

[graann]

Will try tomorrow,on holiday for a week to do a few jobs.

 

[vancleef]

Right with these measurements you will not be able to use the dry verge system using the units because with 3 courses your below the minimum gauge for letting the units interlock so you'll need to have pointed verges.............

From facia to top of first tilling batten 330 mm

From top of first batten to the top of second 235

From top of second batten to the top of the third batten 235 again which will leave you roughly 40 mm off the apex.

This will be the only way for it to work unless you start cutting tiles which i try to avoid at all cost as by cutting the bottom of the tile your doing away with the water bars at the bottom of the tile, and by cuting the top your doing away with the tile nibs.

 

[graann]

Brilliant .Thanks.

 

[graann]

Hi,
I fixed three battens as you described,being very careful with the measurements.
The piece of wood at the front on one of the photos is just a temporary support while i was lifting up the front tiles.
Whatever I tried to do,I couldnt get it right.
The tiles shown are only resting with one lug on the batten,is this correct?
The other concern I had is the gap between the tiles on the middle row.
What am I doing wrong?