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Housing - New Build: Have I been short-changed with my breather membrane for walls and roof?

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    My SIPS structure has gone up and the installers ended up using a non-descript breather membrane. More of an advertising slogan for the SIP company than anything else. Looking at my contract with them it states that walls and roof should have been covered with " Protect TF200 or equivalent"
    http://www.protectmembranes.com/protect-tf200-thermo-insulating-breather-membrane/p/8

    This stuff looks okay from what their datasheet tells me with thermal values etc etc and thermal Resistance of 0.77 W/m2K.

    I'd post a picture of the stuff I've ended up with but it's full on advertising and that's the last thing I want to do (as their services have been shocking). Anyway, it's not multi-layered, has no aluminium reflective layer (like the TF200) and it doesn't take much for the water to start seeping through.

    Even the stuff I covered my shed with was of better quality than this 'advertising hoarding'. TF200 certainly seems to be expensive @ over GBP250 for a 50x1.50m roll.

    Am I right to feel agrieved?

    Thanks,

    KG:cry:
    • CommentAuthorCWatters
    • CommentTimeOct 23rd 2015 edited
     
    Perhaps ask the SIP company for the makers data sheet on the membrane. If they question it perhaps tell them you think Building Control is going to ask.

    Not used the TP200 but I used Protect VP400 membrane on an outbuilding and it was jolly strong stuff. Easily survived many months exposed due to my slow progress with the cladding.
  3.  
    Yes, you want to ensure it has 3rd party certification, or else the BCO does not have to accept it. Tell them that.
    • CommentAuthorcjard
    • CommentTimeOct 24th 2015 edited
     
    Have a look at the following products on the web:

    Sisalkraft builders paper 300
    Tyvek housewrap 200
    Tyvek reflex 850

    Don't Google the numbers, they're just approximate costs for 250 sqm of the stuff though reflex varies a lot, between 400 and 850

    The stuff you have is possibly one of those, and if used on the outside I think it should be housewrap which I think is the equivalent of tf200., if you're referring to the inner membrane, it should be something more like Tyvek airguard or airguard-reflective. I'm using reflex/airguard-reflective in my build, I'd be more than happy to post you a scrap of each to compare to yours

    Please note, if your contract says tf200, and not tf200 thermo then the product you linked is not the same thing.. The thermo designation is for tf200 (a sort of thin plastic, like those untearable Mail envelopes) that is coated with aluminium to make it low emissivity. Housewrap=tf200, reflex=tf200thermo
    • CommentAuthorPeterStarck
    • CommentTimeOct 24th 2015 edited
     
    I have Protect TF200 Thermo on the OSB3 racking on my timber frame and I can say from experience it is very tough and is waterproof. If that is what is in the spec. then ask them to fit it.
  6.  
    Thanks for the comments / suggestions.

    And thanks for the scrap offer cjard - do you by chance have about 10sqm? Since that's what I still need to have covered as they ran out!! need to chase them up on that.

    I will indeed request a data sheet from them and see how it compares to TF200. And it is the housewrap (TF200) that I should have linked to instead.

    Any suggestions how I can keep the roof dry until I have a roofer sorted out? I was just going to bang in some temporary battens then cover with DPM and then bang in some battens over that. Hoping that will keep the roof panels dryer and also get a bit of ventilation going. Don't like the idea of just leaving the OSB to the elements for potentially a couple of months!
    • CommentAuthorTriassic
    • CommentTimeOct 25th 2015
     
    Why not cover the roof using a non-tenting membrane and counter battens. Then all the roofer has to do is fit the battens and the tiles.
    • CommentAuthorTimber
    • CommentTimeOct 25th 2015
     
    As Cjard says....

    Contract says tf200 which is a standard breather membrane. Tf200 thermo is the shiney one.

    I don't think you have been short changed based on those bits of information.
    • CommentAuthorTimber
    • CommentTimeOct 25th 2015
     
    Also to add - Don't leave the SIPs roof panels exposed for a few months. They will be dead by then! Cover it all up with a breather membrane at least.
  10.  
    <blockquote><cite>Posted By: Timber</cite>Also to add - Don't leave the SIPs roof panels exposed for a few months. They will be dead by then! Cover it all up with a breather membrane at least.</blockquote>

    Yes, I've been told that additional breather membrane will arrive next week, so I'll be covereing up the small roof and wall areas that aren't done yet. More roofers are coming out to have a look next week also - hopefully they can give me a decent price and get it tiled soon!
    • CommentAuthorringi
    • CommentTimeOct 25th 2015
     
    Doing your own tiling is not that hard, if you have good access and the roof shame is simple. The only hard bit are where a roof meets a wall.

    The roofer skill in in doing the flushing etc and joining to existing roofs etc.
  12.  
    I did think about it after some crazy quotes, but I've got 4 valleys, rooflights, joining of existing roofs and tiles that will have to meet up with a wall. Plus I need some gable ends to be extended where I will have EWI underneath. I'll probably end up doing the rooflights and create 'ladders' for the EWI, but leave the rest to a tiler.
    • CommentAuthorringi
    • CommentTimeNov 2nd 2015
     
    Posted By: kentishgreenI did think about it after some crazy quotes, but I've got 4 valleys, rooflights, joining of existing roofs and tiles that will have to meet up with a wall. Plus I need some gable ends to be extended where I will have EWI underneath. I'll probably end up doing the rooflights and create 'ladders' for the EWI, but leave the rest to a tiler.


    That does not sound like a DIY tiling job, unless you can get "dryfix" kits for all of the detailing. The tiles meeting with a wall and the joining an existing roof sound like the most likely points for leaks.
  14.  
    <blockquote><cite>Posted By: Timber</cite>Also to add - Don't leave the SIPs roof panels exposed for a few months. They will be dead by then! Cover it all up with a breather membrane at least.</blockquote>

    Hi Timber. breather membrane is all on now but no further with getting the roof tiled. I'm afraid to leave it just like it is now. I don't like leaving it just with breather membrane now for possibly 2 months. I plan to put some temporary vertical battens ontop of breather and then to cover with DPC/plastic as a temporary measure. Will this provide sufficient breathability for the OSB? thanks.

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