Currently having a flat roof to pitch converson done on the third bedroom extension on my 1930's semi. Where the new hipped roof meets the old the builder has made 2 lead valleys. where the cut rosemary tiles sit above the lead there is quite a large gap, should this gap be filled with mortar. I asked the builder and he said he would if I wanted but they usually don't because the mortar can suck the water in by capillary action, is this correct. I'm also not sure if th valleys are constructed properly as, he's basically made a vee out of floorboards and layed lead on top. The pictures of valleys I've seen have a slat running up the edge of the floorboard and the lead shaped over the top of this slat the the tile sits on top
Lead valleys
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J
justlead1
Hi. The valley is normally boarded as you state with the addition of a tilting fillet, an extra piece of timber which when covered with valley lead and dressed allow support for the bottom tiles. Have a look at this detail it may help http://www.leadsheetassociation.org.uk/html/1406.html Good Luck
Asked builder and he said there isn't enough gap when you use rosemarys and if you did put in an upstand it would make the tiles kick up. I must admit the gap didn't look big enough but should he have done something to create a gap that would allow an upstand and the tiles to lay flat.
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the lead cannot be laid in flat..........an upstand needs to be formed and the rosemary tiles cut so they sit down properly.
for rosemarys and slates etc lengths of tilting fillett are the norm or at the very least the lead should be turned over at the edges.
can you post a pic ?
The tiles arn't even 'bedded' in (on undercloak) with mortar, how are the smaller cuts going to stay in place as i can see he hasn't used tile and a half for it.
It's difficult to to tel by the picture will post more pics Monday before scaffolding comes down. I thought that about membrane doesn't look very good does it will ask him to come back and sort it. I thought about using leadmate sealant but suspect it would take quite a few tubes to fill the gap.
Please explain what you mean by undercloaking. Yes there are some small cuts that are loose and will fall out.
We use undercloak that you use on gable ends to go under the tiles in the valley's to bed the tiles on, either nailed to the valley board or the battens never into the lead.
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