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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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    • CommentAuthoradam_w
    • CommentTime7 days ago
     
    Good morning All,

    I've recently been granted planning permission to add a 2 storey extension to the side of my detached 3 bedroom brick and block work house down on the south coast. The house currently has a rather sorry looking garage via a shoddy corridor to the side which I plan to knock down and rebuild. The plans are for the ground floor to stay as a garage and the top half to be a 4th bedroom and en-suite. I've attached a drawing of my intended 'build-up' of the walls hoping that the experienced and well informed ones amongst you will be able to offer me some valued words of advice. The bottom half of the house is to be rendered in Weber Pral M and the top half clad in Cedral weatherboard. I've based my current design on the 'warm frame' principal where all habitable spaces are externally insulated with additional 'inter-stud' insulation to help meeting building regs. Any information or recommendations you could offer would be greatly appreciated!

    Thanks in advance,

    Adam
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    •  
      CommentAuthordjh
    • CommentTime7 days ago
     
    Where's the mebrane under the tiles?

    The joists form a big thermal bridge.

    How is the floor insulated?

    How is the roof insulated?

    Where's the fire separation from the garage to the room above?

    How are the fascia, soffit and gutter attached?

    How are the counterbattens attached?

    Why not use thicker insulation on the outside of the frame?

    Where's the DPM?

    Where's the DPC under the studwork?

    What's under the sole plate?
    • CommentAuthoradam_w
    • CommentTime6 days ago
     
    Mr DJH, thank you for your questions, the points you've made are exactly why I've chosen to join this forum. Please note that I am not a builder or any type of related tradesman, just a keen DIY'er looking to learn.
    Anyway, my answers are as follows;

    Q. Where's the mebrane under the tiles?
    A. Missing from the drawing, i'll shall amend to suit.

    Q. The joists form a big thermal bridge.
    A. I was aware of this but I thought my 60mm PIR would be sufficient to dampen this effect?

    Q. How is the floor insulated?
    A. Again, this is missing from the drawing but I was planning on some 200mm of Earthwool style in between the joists.

    Q. How is the roof insulated?
    A. This detail is also missing from the drawing but as I was hoping to have a vaulted ceiling to compensate for the lack of head height at the eaves, I was going to fit 100mm PIR inter-rafter.

    Q. Where's the fire separation from the garage to the room above?
    A. Again, missing from the drawing but I was planning on using fireboard (doubled if required) sandwiching some 25mm PIR for added insulation

    Q. How are the fascia, soffit and gutter attached?
    A. I am struggling with this detail but I have put a Trapazoid in the model that I was envisaging pinning through the PIR in to the rafters at 400mm centres but I think that may be problematic, looking at it now, it may be better to run a 4x2 and then pin a smaller trapezoid to that if that makes sense?

    Q. How are the counterbattens attached?
    A. I assumed the vertical battens would be pinned straight into the rafters sandwiching the PIR and then the horizontal ones would be pinned in to those.

    Q. Why not use thicker insulation on the outside of the frame?
    A. I'm trying to limit wall thickness and keep insulation thickness common throughout the design to reduce cost.

    Q. Where's the DPM?
    A. I wasn't sure how important this would be to my build as its only intended to be used as a garage?

    Q. Where's the DPC under the studwork?
    A. Unintentionally missing from the drawing :)

    Q. What's under the sole plate?
    A. I was planning on a double course of brickwork, maybe engineering bricks, or could I get away with just extending the oversite to the outer sub DPC wall?
    • CommentAuthoradam_w
    • CommentTime6 days ago
     
    DJH,

    I've taken on pretty much all of your comments and amended my drawing to suit, thanks again for your opinions, they are greatly valued, hopefully I'm a lot closer to my final build-up this time round;

    Kind regards,

    Adam
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