Does new flashing need to be fitted?

Question

I have a flat roof extension to the rear which has lead flashing where the main house joins the roof of the extension.  I am about to have 100mm of external insulation and render fitted.  Should new flashing be provided on to the new render, or will the existing flashing still be ok.

Joshua · Accepted Answer

It depends on the quality of the current lead, in all fairness it is best practise to replace the lead..

Stewart · Answer

So long as the rendering  stops at the flashing it should be ok.

Kris · Answer

No as the waterproofing to the building will still be in check . I would suggest that the new insulation and render does not go past the lead flashing thou so if you ever have a problem with your flat roof it’s easy to repair or replace . Hope this helps

Roger · Answer

Depending on how old the existing lead flashing is, see if any splits in it if there is replace with new code 4 lead.

Shawn · Answer

It depends if its a lead flashing and the lead is in good condition you should be fine

Leon · Answer

Will be fine as long as the new insulation/render finishes above the existing flashing

Patrick · Answer

It would be a better option to have new Flash and fitted

Karl · Answer

The existing flashing will be sufficient. As the flashing will remain in place and the insulation fitted over the top.

Does new flashing need to be fitted?

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