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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthorthebeacon
    • CommentTimeJul 17th 2019 edited

    i currently have all the floor boards of my suspended wooden floor up. I am planning to insulate by attaching chicken wire under the joists and filling the gap between the joists with rock wool. My joists are 90mm deep. I will lay a Pro Clima Intello VLC over the joists before laying a 18mm OSB board layer and floorboards on top of that.

    How should i go about insulating between the joists and sleeper walls? should i not run any insulation over the sleep wall as it will cause bridging?

    Should i be sticking the Pro Clima Intello VLC to the wall all around the floor?

    • CommentAuthortony
    • CommentTimeJul 17th 2019
    If you are in the UK then you are required to add more than 75mm of insulation.
    • CommentAuthorthebeacon
    • CommentTimeJul 17th 2019
    Posted By: tonyIf you are in the UK then you are required to add more than 75mm of insulation.

    I'm planning to create a hammock effect with the chicken wire to fill 200mm between the joists. Should i be insulating between the plate on the sleeper wall and the floor boards?
    • CommentAuthortony
    • CommentTimeJul 18th 2019
    Yes but you will need ventilation holes through the sleeper walls. I would like to see insulation under the joists too.i like the idea of 200mm
    • CommentAuthorthebeacon
    • CommentTimeJul 18th 2019
    Posted By: tonyYes but you will need ventilation holes through the sleeper walls. I would like to see insulation under the joists too.i like the idea of 200mm

    I took out a number of bricks in the sleeper walls to allow for ventilation under the entire floor of the house. And currently placing more air bricks. Do you think its ok to run the insulation over the tops of the sleeper walls? If the insulation is touching the sleeper walls then would it not cause a bridge?
    • CommentAuthorGreenPaddy
    • CommentTimeJul 18th 2019
    Hi thebeacon,

    Might be wrong but I think you're asking about the fact that;

    1. You will have only 90mm gap between floor boards and top of dwarf wall in which to insert insulation.

    2. The 90mm joists rest on the dwarf walls, maybe on a wall plate too, so there won't be any insulation under that contact point.

    3. Can insulation touch the dwarf wall.

    My suggestions would be;

    1. Fill the rectangular gap between wall top and floor board with a kingspan type insul. The wall is prob 100mm thick, so cut 90mm slices, and fit into the gap joist to joist. Bit of foam around for when it shrinks back, to keep in place.

    2. Not much you can sensibly do about the contact point of joist onto wall head. It's only a small area, although repeated.

    3. Once you've filled the gaps between floor boards and dwarf wall, go ahead and install the wool type insulation, packing it tight to the dwarf walls.

    Definitely important that you're increasing through-wall ventilation.
    • CommentAuthortony
    • CommentTimeJul 18th 2019
    • CommentAuthorthebeacon
    • CommentTimeJul 18th 2019
    Thanks GreenPaddy,

    that's what i have been trying to work out.

    Posted By: GreenPaddyDefinitely important that you're increasing through-wall ventilation.

    Yes as mentioned adding extra air bricks at the front and rear of the property and knocked out some in the sleeper walls. Where the hallway runs down the property and the doors open into the living and dining room, below the joists has not been bricked up, offering pretty substantial openings into the voids below the floor.
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