Redland renown tiles batten query

[Ric2013]

Hi guys and gals,

Wanted to pick your brains if possible.

Just been doing some work on my flat roof and had to remove some Renown tiles from the 2 pitched sections that run onto it so as to get the new covering under the sarking felt.

Question: One pitched roof section had the lowest row of tiles sitting on 2 battens (one for below the nibs, and one about 3 quarters of the way down) - this _seems_ right as it means the lowest tile is in the same plane as the ones above it and allows a small gap between the roof covering and the tiles. The other pitched roof section had its lowest tiles sitting on the old mineral felt as there was only one batten. There were a number of cracked tiles... I'm inclined to put a second batten under this row of tiles as well.

1. Would this be a bad idea?

2. Can anyone think why the original roofer may have chosen not to put a second batten on?

By way of background, the flat roof boarding and covering continues about a foot up under the tiles and sarking felt. It is a rear extension, with a pitched tiled roof on two sides - the two tiled roofs meet at right angles with a lead gulley in between them.

Thanks, hope this makes sense.

 

[^woody^]

2. Can anyone think why the original roofer may have chosen not to put a second batten on?

No

Tiles should not rest on the flat roof felt, so put your batten in, which acts as a water bar too

 

[Ric2013]

Thanks for the reply, will go ahead then!