Insulation to suspended timber floor, thin joists [Version ID #93]

Author details

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Detail summary

Detail of woodfibre insulation laid between existing suspended ground floor joists where existing joists are too thin to allow min. 200mm depth for woodfibre installation.

Technical description

Section detail. Floor insulation between joists with breather membrane below. Accessible from below. To achieve target U-value of 0.2W/m2k.

Preparation: Inspect sub-floor and timbers for signs of damp and rot. Before starting work carry out a survey of any structual timbers, particularly those which enter external walls (e.g. floor joists). Record current condition of timbers and moisture content for future reference.

Remove any organic matter from sub-floor and floor void. Ensure all existing air-bricks are unobstructed with clear ventilation path

Parts list

  • Woodfibre Insulation Between Suspended Ground Floor Joists

    Flexible woodfibre insulation. \ Depth TBC on site based on depth of existing joist. \ Friction fit between joists to ensure air-tightness (batts cut approx 20mm wider than opening between joists.) \ Thermal conductivity: .004W/m2K. GWP 0.

    Unger \ www.unger-diffutherm.de \ UdiFLEX

  • Rigid woodfibre insulation fixed across joist.

    Woodfibre insulation. Thickness: to create total 200mm insulation thickness (including woodfibre between joists). Thermal conductivity: .004W/m2K. GWP 0.

    Unger \ www.unger-diffutherm.de \ UdiDiffutherm

  • Seal between floorboards- existing ground floor.

    Draught-proof and seal all timber floors to ensure no air-leaks

    Draughtex. \ www.draughtex.co.uk \ Reference: Draughtex Neoprene Strips

  • Single-sided air seal tape

    Tape for junctions critical to air-tightness. 60mm (typical). \ Accesssories: ORCON F sealant and TESCON PRIMER RP (for use on rough/old surfaces to assist adhesion)

    Pro Clima \ http://www.greenbuildingstore.co.uk/page--pro-clima-airtightness-tapes-options.html \ TESCON VANA/ TESCON PROFIL (2 release tapes)

Revisions

  1. Admin - 2015-04-30 13:23:14

    Intro/summary updated.

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  2. Admin - 2015-04-30 11:10:49

    General reformatting. DWG file uploaded.

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  3. Admin - 2015-03-30 11:11:39

    Preview image and pdf detail file updated.

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  4. Admin - 2015-03-26 13:26:47

    General re-formatting. Introduction revised. Technical description updated with approved docs and additional notes.Parts list updated with supplier links.

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  5. Admin - 2015-03-17 10:27:08

    Detail updated. errors removed.

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  6. Admin - 2015-03-17 10:23:23

    Version 2. Introduction expanded. Technical description updated and expanded with BS codes and approved docs. Parts list update with codes.

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  7. Admin - 2015-03-04 15:47:03 [Displayed version]

    Version 2- Parts list updated

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  8. Admin - 2015-03-04 15:45:55

    First Version

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