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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Housing - Renovation: Thermal Skirting

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  1.  
    • CommentAuthorMatBlack
    • CommentTimeFeb 6th 2020
     
    I was considering EWI now on the sides and back of the property, 100mm of EPS, followed by lime render.

    I think it would be beneficial if I took the EWI down to the footings. As its a solid brick wall, with just 2 steps of corbel like brick footings, would I comprimise the force pushing in against the wall.

    Could the EPS still provide the necessary force needed when installed? ( I would install it bit by bit)
    • CommentAuthortony
    • CommentTimeFeb 6th 2020
     
    Stuff cannot provide a force, gravity does that
    •  
      CommentAuthordjh
    • CommentTimeFeb 6th 2020
     
    Posted By: tonyStuff cannot provide a force, gravity does that

    Stuff alongside other stuff can and does restrict the movement of the other stuff. The middle of a mountain is held up by the presence of the sides of the mountain.
    • CommentAuthortony
    • CommentTimeFeb 7th 2020
     
    If there is a force then there is acceleration unless there is an equal and opposite force
  5.  
    Posted By: MatBlackI was considering EWI now on the sides and back of the property, 100mm of EPS, followed by lime render.

    I think it would be beneficial if I took the EWI down to the footings. As its a solid brick wall, with just 2 steps of corbel like brick footings, would I compromise the force pushing in against the wall.

    Could the EPS still provide the necessary force needed when installed? ( I would install it bit by bit)


    Why use lime render rather than the normal adhesive and mesh coat followed by thin film acrylic render?

    Yes it would beneficial to take the EWI down to the footings.

    The footings are corbeled out to spread the load of the wall by giving a wider ground area to bear the load. The load from the footings is calculated as going downwards and outwards at 45% from the base of the footings. The ground down to the base of the footings is not required to provide any sideways support or pressure to the footings so it is safe to either (or both) put EWI and a french drain down to the base of the footings.

    When taking EWI down you must NOT go below the base of the footings or preferably stop one row short of the base.

    Do you have solid or suspended floors? (A potential ventilation issue with EWI down to the footings and suspended floors)
    • CommentAuthorMatBlack
    • CommentTimeFeb 8th 2020
     
    Posted By: Peter_in_Hungary
    Posted By: MatBlackI was considering EWI now on the sides and back of the property, 100mm of EPS, followed by lime render.

    I think it would be beneficial if I took the EWI down to the footings. As its a solid brick wall, with just 2 steps of corbel like brick footings, would I compromise the force pushing in against the wall.

    Could the EPS still provide the necessary force needed when installed? ( I would install it bit by bit)


    Why use lime render rather than the normal adhesive and mesh coat followed by thin film acrylic render?

    Yes it would beneficial to take the EWI down to the footings.

    The footings are corbeled out to spread the load of the wall by giving a wider ground area to bear the load. The load from the footings is calculated as going downwards and outwards at 45% from the base of the footings. The ground down to the base of the footings is not required to provide any sideways support or pressure to the footings so it is safe to either (or both) put EWI and a french drain down to the base of the footings.

    When taking EWI down you must NOT go below the base of the footings or preferably stop one row short of the base.

    Do you have solid or suspended floors? (A potential ventilation issue with EWI down to the footings and suspended floors)



    Thank you for clearing that up! I had the 45 degree going from the top of the ground level soil etc. That makes me happier about the idea.

    I was going for lime to try and keep some permeability, as I would use eps, then lime plaster on the inside of the solid brick walls.

    I'm currently changing the floors to solid also.
  7.  
    Posted By: MatBlackI was going for lime to try and keep some permeability, as I would use eps, then lime plaster on the inside of the solid brick walls.

    The thin film acrylic (or silicon based) render sold for EWI is sold as vapour permeable as is the adhesive that goes underneath the acrylic render so I can't see a permeability advantage in using lime.
    •  
      CommentAuthordjh
    • CommentTimeFeb 9th 2020
     
    Posted By: Peter_in_HungaryThe thin film acrylic (or silicon based) render sold for EWI is sold as vapour permeable

    I think you'll have to be more specific than that, since for example https://www.foveotech.co.uk/professional-zone/technical-advice/acrylic-vs-silicone-plaster-get-to-know-the-core-differences says "Acrylic plasters form a water vapour barrier (feature high diffusive resistance), whereas silicone ones are vapour permeable." and other pages say similar things.
  9.  
    There will be differences between manufacturers so best to read what is on the tin. e.g.
    CT 60 Acrylic plaster, structure like stone with grain 1.5 mm, 2.0 mm or 2.5 mm.....
    Resistant to weather conditions with low absorbability and high elasticity
    Vapour permeable and resistant to damage
    BioProtect formula – resistant to the development of fungus, algae and mould
    • CommentAuthorMatBlack
    • CommentTimeFeb 10th 2020
     
    Thank you for that, Its great to know some of the products are vapour permeable, I just assumed that sort of finish would not be!

    Many thanks again!

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