Lead Flashing

[cdh]

I've just finished a new pitched roof over my porch and garage and now need to put the lead flashing on. I've seen a few houses that look like they have got black lead, but I went to my local builders/roofers merchants yesterday and they said that it only comes in grey (doesn't matter what code it is).

Does anyone know if this is right?

Thanks

 

[masona]

More lightly been painted over lead

 

[RedHerring]

It may not be lead. There are alternatives such as Ubiflex which comes in black, grey or even terracota

 

[cdh]

Thanks.

As the porch roof is part of an extension, the plans show Code 4 Flashing. Would i have to advise building Control if I was to use Ubiflex?

Going to have a look at what I can out about Ubiflex, any advantages/disadvantages?

I've already cut away the mortar for the lead, so will need to check if Ubiflex will fit the same line.

 

[RedHerring]

I have no experience wth Building Control and Ubiflex unfortunately. I've only used it in France where lead is not allowed. I wouldn't have thought that BC would have any issues with it but a phone call would alleviate any worries.

It will fit in the chases already made for lead without problem. It's easier to cut and handle imo.

 

[Nige F]

Ubiflex unfortunately. I've only used it in France where lead is not allowed.

In Germany is it called UBERflex

 

[drnail]

wouldent make a bit of difference with building control imo

 

[cdh]

Thanks for all the advice, I've now decided to go with the lead.

Can anyone give me any tips on whether it is best to put lead in the mortar joints and re mortar it in or to use the specialist sealant e.g lead mate to keep it in place?

 

[hotrod]

Thanks for all the advice, I've now decided to go with the lead.

If you're going with lead don't forget the patination oil!

 

[noseall]

Thanks for all the advice, I've now decided to go with the lead.

Can anyone give me any tips on whether it is best to put lead in the mortar joints and re mortar it in or to use the specialist sealant e.g lead mate to keep it in place?

The lead needs to be 'mechanically' wedged-in either by using proprietary clips or home made lead wedges.

The mortar joint can either be pointed with mortar of filled with leadmate silicone.

If going down the mortar route then damp down the mortar joint first.

 

[cdh]

OK Thanks.

I've read that the minimum over hang on the tiles is 150mm, would I be able to do it at about 90-100mm?
It's only a small roof and I think 150mm would make it look heavy.

 

[RedHerring]

The minimum overlap is designed to prevent wind-blown rain getting up under the flashing. Similar to the lap on the slates/tiles. It's nothing to do with the size of the roof.
The steeper the roof the less overlap required. Reduce it from that recommended at your own risk.

 

[noseall]

OK Thanks.

I've read that the minimum over hang on the tiles is 150mm, would I be able to do it at about 90-100mm?
It's only a small roof and I think 150mm would make it look heavy.

The roof tiles will be ok with 100mm head cover. It is recommended that the lead up-stand be 150mm for splash-back prevention.