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Ridgid foam on the outside of the house..vapour barrier??

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  • #16

    Re: Ridgid foam on the outside of the house..vapour barrier??

    Re: Ridgid foam on the outside of the house..vapour barrier??

    Yes, it is "Tentest" and it has been used for years and years in Ontario. Every Brick veneer house in the GTA is or was sheathed in Tentest.
    "Do it Right!"

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    • #17

      Re: Ridgid foam on the outside of the house..vapour barrier??

      Re: Ridgid foam on the outside of the house..vapour barrier??

      my guess would be with no rain screen batten between the Pine Siding and Foam you are/were getting a Dewpoint where they touch , ie it is sweating and without the rainscreen to enable the "dew" to evaporate , even with the back priming the back of the Siding was saturated most of the time....

      where in the wall was the new building paper put ? two layers ?

      M.

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      • #18

        Re: Ridgid foam on the outside of the house..vapour barrier??

        Re: Ridgid foam on the outside of the house..vapour barrier??

        Originally posted by Kbird123 View Post
        my guess would be with no rain screen batten between the Pine Siding and Foam you are/were getting a Dewpoint where they touch , ie it is sweating and without the rainscreen to enable the "dew" to evaporate , even with the back priming the back of the Siding was saturated most of the time....

        where in the wall was the new building paper put ? two layers ?

        M.
        I did not put tarpaper, I replaced it with foam. The next layer is 1'' tg vertical pine nailed on 4'' horizontal wood. the inside is 1''vertical vjoint nailed through strapping.

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        • #19

          Re: Ridgid foam on the outside of the house..vapour barrier??

          Re: Ridgid foam on the outside of the house..vapour barrier??

          Thanks for all the comments. The reason for considering a replacement is that the tentest is buckling in some places and is certainly not air sealed. Lots of draft around electricals in the winter. I also agree with the comment about thermal breaking the studs. My biggest concern is the state of the interior vapour barrier. From a number of reno jobs I have done inside ,I am sure that it is not totally sealed at the bottom plate or around the electricals. Also affords me the opportunity to check out the integrity of the fiberglass insulation. Guy was not much of a builder it seems..place is only 25 years old. Also the comment about strapping outboard of any rigid foam is a good one..will check with any local requirements. Was planning to use vinyl siding so weight is not an issue.

          Very familiar with "Muskoka siding", having lived there from 1970 to 97. Lots of it used on the less upscale places in the back country..didn't see to much on the lakes!!

          Bill

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          • #20

            Re: Ridgid foam on the outside of the house..vapour barrier??

            Re: Ridgid foam on the outside of the house..vapour barrier??

            no building paper and no vapour barrier ? (iamtooler) might work in Florida not sure about Montreal...appears you did this many years ago , and I think vinyl siding was done this way, way back but sounds like siding is on battens spaced off the foam? or on the foam?

            Rainscreening is the way to go these days ,and code here in Van. but Not going to get in a big debate about it anyway, but you might like to do some more reading.....

            BCRainScreen.pdf
            How to Avoid Moisture Damage to Walls from Condensation.pdf


            there is lots of info online Green building advisor.com is one with many articles.....

            http://www.greenbuildingadvisor.com/...ut-rainscreens

            http://www.greenbuildingadvisor.com/...ally-necessary

            http://www.greenbuildingadvisor.com/...r-wall-can-dry

            http://www.greenbuildingadvisor.com/...foam-sheathing

            http://www.greenbuildingadvisor.com/...wall-sheathing

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