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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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    • CommentAuthorLehobbit
    • CommentTimeNov 2nd 2021 edited
     
    In our renovation project we have two floors to insulate between. One will be the floor between the ground and second floor and this will be about 85-90 metres square. We are replacing all the floor beams and will be using OSB over the top of the beams to create a sub floor. This will then have pine chevrons to carry the 25mm thick pine floorboards above/ Electric wiring and water pipes will run in the void. I would think we will be using approx 75mm high chevrons so we will have a void to insulate.

    For the attic floor above the frame work is already in place and around 275mm thick. OSB will be laid over the to to create an attic floor and pine cladding on the underside. This area will be about 70m2 (once the thickness of the framework is subtracted).

    We have been looking at Steico flex wood fibre insulation for insulating the voids and also loose fill cellulose.

    The Steico flex works out quite pricey compared to the cellulose.

    The R value of 200mm of Steico Flex is 5.25. How do i find the R value for the same thickness of cellulose?

    Does anyone have any other suggestions of cost effective but ecological solutions?
    •  
      CommentAuthordjh
    • CommentTimeNov 2nd 2021
     
    Sorry, but what is a 'chevron' in this context? I have visions of arrows.

    When you say 'loose fill cellulose' do you mean the stuff sold in bags for loft insulation, or professionally blown-in cellulose?

    Posted By: LehobbitHow do i find the R value for the same thickness of cellulose?

    Find a specific product. Look in its data sheet for its lambda or 'k' value and do the sum to convert it to a U-value (or R-value) for the thickness you have in mind.

    U-value = ƛ-value / thickness
  1.  
    Out of interest why are you doing this? Is it for sound or heat? I was considering the same whilst my ceilings are open but decided it wasn't overly important given that both floors are within the thermal 'envelope' of the house. Looking at the complexity of pipes and wiring in this void I think it would be very difficult to install woodfibre batts.
    • CommentAuthortony
    • CommentTimeNov 2nd 2021
     
    For sound insulation use rockwool
    • CommentAuthorowlman
    • CommentTimeNov 2nd 2021 edited
     
    <blockquote><cite>Posted By: tony</cite>For sound insulation use rockwool</blockquote>



    +1; and I'd use the more rigid batts they are excellent for slightly oversizing before inserting to accommodate odd shapes.

    @ djh maybe the "chevrons" are diagonal battens screwed top the OSB to create a service void and somewhere to nail the wood floor to??
    • CommentAuthorLehobbit
    • CommentTimeNov 5th 2021
     
    <blockquote><cite>Posted By: djh</cite>Sorry, but what is a 'chevron' in this context? I have visions of arrows.

    When you say 'loose fill cellulose' do you mean the stuff sold in bags for loft insulation, or professionally blown-in cellulose?

    <blockquote><cite>Posted By: Lehobbit</cite>How do i find the R value for the same thickness of cellulose?</blockquote>
    Find a specific product. Look in its data sheet for its lambda or 'k' value and do the sum to convert it to a U-value (or R-value) for the thickness you have in mind.

    U-value = ƛ-value / thickness</blockquote>


    Sorry I was slipping into French parlance!! Chevron is like a chunky batten say 75mm by 60mm for example!
    • CommentAuthorLehobbit
    • CommentTimeNov 6th 2021 edited
     
    <blockquote><cite>Posted By: modernvictorian</cite>Out of interest why are you doing this? Is it for sound or heat? I was considering the same whilst my ceilings are open but decided it wasn't overly important given that both floors are within the thermal 'envelope' of the house. Looking at the complexity of pipes and wiring in this void I think it would be very difficult to install woodfibre batts.</blockquote>

    Hi there. Mainly for sound and also to keep most of the heat from our 18.3 kW wood burner downstairs! The rooms above will be super insulated and heated with wall mounted electric infra red radiators which are lower wattage than standard electric radiators. We may install some closeable floor vents to allow heat into the main bedroom above where the wood burner is. Maybe loose fill such as cellulose is better for pipes etc.
    • CommentAuthortony
    • CommentTimeNov 6th 2021
     
    Floor vents will breach fire barrier, let CO through and a LOT of noise/sound
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