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Floor and Roof insulation for breathable house

  • 14-12-2017 9:32am
    #1
    Howzit17
    Registered Users Posts: 62 ✭✭


    Working on renovating 1910ish house .Typical 2 story farmhouse of the time.
    Thick stone walls ,now with wet dash - practically no foundations and the ground floor is a simple suspended timber floor over dirt no more than 8 inches below the floorboards. The floor plates (which have probably been in situ over 100 years) ,there is one damp patch and one or two corner presses have a slight mould , so will be lifting the boards that I thought I would have been able to keep, and since lifting wondering what would be the best type of insulation?
    I plan on later picking walls and applying hemp lime to walls and felting roof , also wondering what roof insulation would be best for breathable house?
    And preferable most cost effective, is it worth the cost to insulate floors?


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,141 Mod ✭✭✭✭BryanF


    Have you used the search function?


  • #3
    Howzit17
    Registered Users Posts: 62 ✭✭Howzit17


    Some unfinished answers for stone house floor insulation, plenty cavity wall floor insulation posts.wasnt sure if same measure to be taken with stone wall


  • #4
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,141 Mod ✭✭✭✭BryanF


    Best wall insulation in an old stone house: hemp lime or calcium silicate, or anything breathable that doesn’t suffer from mould.

    Roof, Are you taking of the existing and starting again? If so breathable felt and mineral wool or cellulose would be breathable options with intello vapour barrier internally.

    Floors is a tough one, depends on disruption. If your not doing the floors it may be best to consider external wall insulation


  • #5
    Howzit17
    Registered Users Posts: 62 ✭✭Howzit17


    Cheers Bryan ,
    Yeah having trouble deciding what to put under the floor.
    Builder suggested just putting some rubble and cement and putting boards back on...I would like to keep original boards, but thinking might loose a lot when pulling them up.
    the same builder didn't know what I was on about when I mentioned hemp lime, so I guess I will just do that myself at a later stage when have time.
    Yes, the slates will come off as there is no felt at all on now


  • #6
    Lumen
    Registered Users, Registered Users 2 Posts: 31,137 ✭✭✭✭Lumen


    Howzit17 wrote: »
    Cheers Bryan ,
    Yeah having trouble deciding what to put under the floor.
    Builder suggested just putting some rubble and cement and putting boards back on...I would like to keep original boards, but thinking might loose a lot when pulling them up.
    the same builder didn't know what I was on about when I mentioned hemp lime, so I guess I will just do that myself at a later stage when have time.
    Yes, the slates will come off as there is no felt at all on now
    Red flag right there. Don't take conservation advice from a builder who doesn't understand conservation.

    There are horror stories about combining old and new construction techniques and materials.

    https://passivehouseplus.ie/forum/showthread.php?1138-Thick-Cottage-Walls-Should-I-Insulate


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  • #7
    Howzit17
    Registered Users Posts: 62 ✭✭Howzit17


    Cheers man,
    That's what I know.will get him to do the work he good at


  • #8
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,141 Mod ✭✭✭✭BryanF


    Howzit17 wrote: »
    Cheers Bryan ,
    Yeah having trouble deciding what to put under the floor.
    Builder suggested just putting some rubble and cement and putting boards back on...I would like to keep original boards, but thinking might loose a lot when pulling them up.
    the same builder didn't know what I was on about when I mentioned hemp lime, so I guess I will just do that myself at a later stage when have time.
    Yes, the slates will come off as there is no felt at all on now
    Hemplime is a wet trade, mind your construction sequence. You could always look at an of the shelf product, but the breathable options can appear costly against the cheap dry-lining options such as plasterboard slabs - be careful who you listen to, interstitial condensation and mould are a consequence.

    Sounds like You must do details for the builder. Particularly eaves detail. No doubt some sole plate repair will be required and concrete will be the go-to material so thermal bridging must be considered.

    Look up ‘leca’ for the floor - for a product that will work with the likes of limeCrete.. If your messing with concrete you could just do a traditional radon/EPS/concrete floor


  • #9
    Howzit17
    Registered Users Posts: 62 ✭✭Howzit17


    Finally got a quote for the roof...

    Erect Scaffolding
    Strip & Refelt Roof
    New Laths
    Relead Chimney, and plaster
    New P.V.C Fascia & Guttering
    1 side of roof roof with exsisting slates and the other side new "Bangor" slates and new ridge tiles
    Labour & Materials
    5,750 Euro
    Any ideas how much "mineral wool or cellulose would be breathable options with intello vapour barrier internally" should add to this cost?Any preference on which to use? I've yet to get a quote for this.
    And since getting a new roof with extended overhang, External insulation will now be possible, but is there any trouble applying this to a wetdash finish? see photo link below
    https://imgur.com/tj5mKFo
    Just want to Get the Roof and walls sealed 1st, then can concentrated on picking the walls and applying the hemp myself at a later time, do you think this would be the correct construction sequence?


  • #10
    hochnie
    Registered Users Posts: 28 ✭hochnie


    Howzit17 wrote: »
    Finally got a quote for the roof...

    Erect Scaffolding
    Strip & Refelt Roof
    New Laths
    Relead Chimney, and plaster
    New P.V.C Fascia & Guttering
    1 side of roof roof with exsisting slates and the other side new "Bangor" slates and new ridge tiles
    Labour & Materials
    5,750 Euro
    Any ideas how much "mineral wool or cellulose would be breathable options with intello vapour barrier internally" should add to this cost?Any preference on which to use? I've yet to get a quote for this.
    And since getting a new roof with extended overhang, External insulation will now be possible, but is there any trouble applying this to a wetdash finish? see photo link below
    https://imgur.com/tj5mKFo
    Just want to Get the Roof and walls sealed 1st, then can concentrated on picking the walls and applying the hemp myself at a later time, do you think this would be the correct construction sequence?

    Hi. Any chance you could message me the details of the roofer you used for this job?
    What method did you use for insulating the floor?


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