Trying to fix flashing.

Minstadave

Minstadave

Minstadave

Caporegime
Joined
8 Jan 2004
Posts
32,868
Location
Rutland


This end of the flashing keeps coming loose. Had a roofing company fix it a couple of years back but it's come loose and all the mortars come out that they used.

I can't shape it enough to get it in so I can fix it. Do I need to pull the full length out and reshape it?
 
Minstadave said:


This end of the flashing keeps coming loose. Had a roofing company fix it a couple of years back but it's come loose and all the mortars come out that they used.

I can't shape it enough to get it in so I can fix it. Do I need to pull the full length out and reshape it?
Click to expand...
I would be tempted to remove, do a clean bend and refit.

BTW, my limited undertanding is that you use flashing clips to secure it in the crevice, not cement, that just fills the gap.

AaeeGC1.jpg


But interested in anyone with actual experience!
 
Demon said:
I would be tempted to remove, do a clean bend and refit.

BTW, my limited undertanding is that you use flashing clips to secure it in the crevice, not cement, that just fills the gap.

AaeeGC1.jpg


But interested in anyone with actual experience!
Click to expand...
Thanks will get some clips. See other people hammering bits of folded up lead (found one of these when I was cleaning out the mortar).
 
Somebody has previously asked about repairing lead, the below links may help. Obviously be careful how you do it as lead is toxic. Anyway, here you go:

Any roofers here? Lead box join.

O/H is in a dispute with a builder over some poor workmanship on the roof of her extension due to a leak and the following remedial work. There is a box join where the new single storey extension pitched roof meets against part of the existing build. Sections of lead flashing have been...
forums.overclockers.co.uk forums.overclockers.co.uk

 
Minstadave said:


This end of the flashing keeps coming loose. Had a roofing company fix it a couple of years back but it's come loose and all the mortars come out that they used.

I can't shape it enough to get it in so I can fix it. Do I need to pull the full length out and reshape it?
Click to expand...
Id remove the flashing, clean the joint and then do a fresh bend on the lead. Personally I wouldn't bother with clips, just make some wedges out of lead and hammer them home with a bolster, then mortar. Or get the guy back to do it properly.
 
As previous posts I would folder a deeper top part on the lead, use clips or lead wedges to hold but I would then use one of the modern specialist lead flashing to brick sealants rather than mortar.

I've found these very durable even compared to mortar with something like SBR in and wetted brick work. They're easy to use as they stick to the lead and brick really well. The only extra effort is some care applying/smoothing but that's not hard to do and leaves a smart finish that won't crack with movement.
 
Simon42 said:
As previous posts I would folder a deeper top part on the lead, use clips or lead wedges to hold but I would then use one of the modern specialist lead flashing to brick sealants rather than mortar.

I've found these very durable even compared to mortar with something like SBR in and wetted brick work. They're easy to use as they stick to the lead and brick really well. The only extra effort is some care applying/smoothing but that's not hard to do and leaves a smart finish that won't crack with movement.
Click to expand...
Thanks, I'll go get some clips and sealant. I've never made up mortar before so was thinking about using sealant.
 
Minstadave said:
Thanks, I'll go get some clips and sealant. I've never made up mortar before so was thinking about using sealant.
Click to expand...
Lead mastic is what you are after. Just make sure you get a clean 90 degree fold on the lead (watch some lead beating videos; it is pretty simple). You may need a mortar rake on an angle grinder to cut out some more cement from that gap that isn't adequate.

Edit: Don't bodge it as water will run behind the lead. I had a failed lead install and it was an absolute nightmare as the water made its way beneath the roof felt and the whole roof had to be ripped off.
 
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dLockers said:
Lead mastic is what you are after. Just make sure you get a clean 90 degree fold on the lead (watch some lead beating videos; it is pretty simple). You may need a mortar rake on an angle grinder to cut out some more cement from that gap that isn't adequate.

Edit: Don't bodge it as water will run behind the lead. I had a failed lead install and it was an absolute nightmare as the water made its way beneath the roof felt and the whole roof had to be ripped off.
Click to expand...
I'll whip the whole piece out, get a better bend on it and sit it in the gap properly.
 
Finally finished this:

Removed the entire piece, it was impossible to get back straight enough to get it back on. Lead was also too bloody heavy whilst balancing on the porch roof.

Used Bostik Flashband in the end. Cleared up all the surfaces, used the primer, fitted it and used clips to hold it in place. Then glued the lot in with flashing glue.

It looks OK, obviously the new Flashband doesn't match the other bits of lead but it was such a massive PITA I'm done. It's waterproof atleast.
 
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