Lead flashing on new extension

emmetlego · 08-10-2014 9:36am #1

Hello,

Being the family handy man, and a builder having left a family member in the lurch by not completing an extension, I have been asked would I finish the job. It's all relatively minor stuff (fascia boards, guttering etc) but the one job I'm wary of, is the flashing where the pitch roof meets the existing house. I have done flashing before onto conservatories etc, but never through an externally insulated wall. so if you please, I have a few questions…

Do I have to cut deep enough to go through the insulation AND through the existing masonary, or is it sufficient to go into JUST the insulation. If it's the former or latter, how deep should I go into the brick or insulation? Also, is there a preferred brand of sealant to use at the cut joint where the flashing is inserted???

Also, is there anything I should be cautious of? It would appear this builder was a bit of a scheister!!!

Any help would be hugely appreciated.

Thanks in advance.

EL.

emmetlego · 09-10-2014 9:59pm

Anybody?

sky6 · 10-10-2014 10:11am

What about using Flashband instead of Lead. If the Surface of the House is relatively smooth like a plaster or nap finish then Flashband should work very well.
It has an Adhesive backing and is made for sticking to all types of surfaces. just leave 80 to 100 mm up the Wall. If you wanted you could just cut into the insulation a little to provide a drip edge but probably not necessary.

emmetlego · 10-10-2014 3:36pm

Thank you sky 6, appreciate it...

sky6 · 11-10-2014 8:17pm

I was thinking also instead of cutting into the insulation just use another piece of flashband to create the drip. If you take a 3 inch strip to stick on above the large piece
and just lap it over the top edge of the large piece.
The good thing with flashband is it moulds and shapes really easy.
Incidentally I used it on my Garage roof in 1980 and it's still there never ever a leak.

Best of luck with it and thanks.

Lead flashing on new extension

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