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Spray foam insulation to bond old slates to roof?

  • 01-02-2016 8:45pm
    #1
    antiskeptic
    Registered Users, Registered Users 2 Posts: 9,555 ✭✭✭


    A few neighbouring properties along my 100+ year old terrace have lost / slipped slates of in the recent storms. The roofs are in excellent condition generally: nice and straight and slates in good condition - except for the rusted nails holding them in place.

    I thought it might be an idea to get that spray foam insulation I've seen advertised installed to my own roof to stick the slates into position.

    Is that a runner? What about moisture build up in the wooden structure above the foam?


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    Go to foam installer, ask for their product name, Google it's certificates eg Iab/bba data sheet etc, read the install spec.

    None im aware of would be certified/tested for this application


  • #3
    antiskeptic
    Registered Users, Registered Users 2 Posts: 9,555 ✭✭✭antiskeptic


    BryanF wrote: »
    Go to foam installer, ask for their product name, Google it's certificates eg Iab/bba data sheet etc, read the install spec.

    None im aware of would be certified/tested for this application

    Good advice re: breathability. I suppose I'd be less concerned about it being certified for this purpose and more concerned that it sticks like poo to the proverbial poo-handling-device.

    Anyone ever experience whether it sticks like expandable foam to things (because if it did then it would likely add anti-slate-slip sufficient for need)


  • #4
    con1982
    Registered Users, Registered Users 2 Posts: 515 ✭✭✭con1982


    antiskeptic wrote: »
    A few neighbouring properties along my 100+ year old terrace have lost / slipped slates of in the recent storms. The roofs are in excellent condition generally: nice and straight and slates in good condition - except for the rusted nails holding them in place.

    I thought it might be an idea to get that spray foam insulation I've seen advertised installed to my own roof to stick the slates into position.

    Is that a runner? What about moisture build up in the wooden structure above the foam?

    This is a bad idea for a number of reasons. Sealing the underside of the slate with a foam will trap moisture. Your battens will decay, probably the rafters too. The foam typically used to seal between rafters would not be sufficient to hold slate for very long. I'm not a fan of this type of insulation. Anywhere I've seen it used, there have been problems.

    Check out the department of environment guide to roof maintenance and repair


  • #5
    Jonathan222
    Registered Users, Registered Users 2 Posts: 91 ✭✭Jonathan222


    On a related issue, I have slates to sell from a garage we are planning to demolish.

    I've heard you could get a decent price to sell the slates and as every bit helps, was wondering if anyone would know what kind of price I should expect to get for the slates? The building is about 100 yrs old and the slates are tacked onto the beams directly, but all in good condition.

    Any help would be appreciated.


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