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  • #1819948
    tomdenne
    tomdenne
    Participant
    Joined: 29 Oct 2008
    Location: 58 La Nièvre
    Total posts: 4459

    Have a slight leak between our slate roof and chimney stack. Suspect that the zinc flashing has become porous although it appears quite sound. Had a similar zinc flashing leak about eight years ago and was able to completely cure it with Fortix 427, an elastic water based sealant, which unfortunately is now not available anymore.

    Was considering using this alternative… https://www.amazon.fr/ARCAFILM-Etancheite-infiltration-R%C3%A9paration-Mat%C3%A9riaux/dp/B01LZTCTHC/ref=lp_10808152031_1_1?srs=10808152031&ie=UTF8&qid=1516460805&sr=8-1
    Has anyone else used this product and does it work?
    https://www.amazon.co.uk/Evercryl-Repair-Waterproofing-Colours-Everbuild/dp/B01MTQUNH1/ref=cm_cr_arp_d_product_top?ie=UTF8
    Was also looking at this similar sealant from Sika, which is a company whose stuff I’ve always found to be very good.


    Tom

    #1819964
    Avatar
    riquet
    Participant
    Joined: 15 Sep 2010
    Location: North Tyneside & East 82 (not there often enough)
    Total posts: 2420

    Can you get something sent from the UK ? Johnson Bituminous roof repair. A grey semi liquid flexible stuff that works a treat.


    #1819979
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    fittersmate
    Participant
    Joined: 08 Jun 2009
    Location: Brittany France dept 56
    Total posts: 1624

    Does zinc flashing become porous? Could it be that a slate has a hairline crack in it? I’ve had this happen and it is the very devil to find the offending slate.

    You would think from the size of the leak that a slate was missing or had a hole in it but just found one with a nigh-on invisible crack in it after searching for 20 minutes with a strong light source.

    I have no idea what causes slates to develop these cracks, nobody had been on the roof, nothing had dropped onto the roof.


    #1820002
    Aardvark
    Aardvark
    Participant
    Joined: 27 May 2009
    Location: 22
    Total posts: 2457

    Frost.  I have a roof full of them, coupled with the naff French method of flashing with a lump of cement instead of proper lead or zinc.  Luckily we don’t have a ceiling in our bedroom so its easy to find where to place the buckets when it rains.   B-)


    #1820006
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    elsie
    Participant
    Joined: 05 Feb 2007
    Location: N/A
    Total posts: 1399

    tomdenne: is it a continuing leak or is it a one-off with rain being forced in by the strong winds we’ve had recently?


    #1820045
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    mikej
    Participant
    Joined: 21 Jun 2011
    Location: Dordogne sometimes and Kent the rest
    Total posts: 5287

    IMO Lead properly laid and let into a chimney is better than the horrible zinc flashings the French plumbers insist on using, failing that, at a push Sylglas flashing tape is still better than zinc that goes rusty and looks awful.

    Mike


    WFIPFLL

    #1820046
    tomdenne
    tomdenne
    Participant
    Joined: 29 Oct 2008
    Location: 58 La Nièvre
    Total posts: 4459

    tomdenne: is it a continuing leak or is it a one-off with rain being forced in by the strong winds we’ve had recently?

    I’m not sure Elsie; it’s a spare room that we used as a store. The walls were covered with stapled on cloth so the stain on the plaster was not evident. Water could have been seeping through for a long time but the recent weeks of rain would have made matters worse. My moisture meter reads 33% in the worst spot.

    Here are pictures of the stain and chimney stack. The lower right hand side of the chimney is directly over the stain.

    View post on imgur.com


    Tom

    #1820047
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    fittersmate
    Participant
    Joined: 08 Jun 2009
    Location: Brittany France dept 56
    Total posts: 1624

    As a temporary fix around that chimney base I would be up there with an aerosol of squirty polyurethane foam – it’ll go off really quickly as it’s damp.


    #1820066
    Annabelle’s Papa
    Annabelle’s Papa
    Participant
    Joined: 08 Sep 2012
    Location: Worcestershire & Brittany 22
    Total posts: 716

    Hi Tomdenne, I have used the Everbuild product that you have mentioned and it is very good but only for small areas, as you have send it may be a repair on a repair I probably would look for another solution.


French Electrical & Other Building Issues
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