Replacing a lead flashing

frugglewump

The lead flashing between the house & the 1 storey extension is coming away from the wall & letting rain in. I covered it with a groundsheet held in place with bricks - but am having trouble finding someone willing to do a job this small.

Is it simply a case of removing the flashing, applying mortar along the seam like glue & replacing it/putting in a new one? You see, that doesn't sound too difficult - have I underestimated the work required?

I believe the flashing is coming away because the gutter from the roof goes straight down to a point just above the flashing & just empties. It trusts the gradient of the flat roof to get the water into the gutter along the edge of the extension. Presumably a 90degree angle on the bottom to redirect the water so it doesn't hit the roof will solve the underlying problem.

BobProperty

frugglewump wrote:

....Is it simply a case of removing the flashing, applying mortar along the seam like glue & replacing it/putting in a new one?.....

Basically, yes, but given that it has come away, then the suspicion is that it wasn't done properly in the first place.

frugglewump

BobProperty wrote:

Basically, yes, but given that it has come away, then the suspicion is that it wasn't done properly in the first place.

So what is "properly" ?

weekendwarrior

You are better off using lead mate sealant or similar as it bonds to lead better than mortar.

Clean out the joints first, replace the lead flashing and repoint with lead mate, using a silicone gun-

http://www.screwfix.com/app/sfd/cat/pro.jsp?id=63515&ts=61611

BobProperty

frugglewump wrote:

So what is "properly" ?

I think there is a .pdf on here somewhere: http://www.leadsheetassociation.org.uk/

plumb1_2

weekendwarrior wrote:

You are better off using lead mate sealant or similar as it bonds to lead better than mortar.

Clean out the joints first, replace the lead flashing and repoint with lead mate, using a silicone gun-

http://www.screwfix.com/app/sfd/cat/pro.jsp?id=63515&ts=61611

Yes , But also fix the lead with lead wedges.

frugglewump

Ah now I know why it all went wrong.

All that's on the roof at the moment is a large amount of mortar stuck into the right-angle like it came from a veyr large toothpaste tube, with a strip of lead bent into an L shape stuck on top.

No sealant & nothing pushed into the vertical brickwork at all.