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  • Home
  • Air Tightness
  • Thermal Supports
  • Ventilation Advice
  • Our Story
  • Our Blog
    • Air Tightness at floor level
    • Air Tightness for windows & doors
    • Thermal Brackets for windows & doors
    • Air Tightness for roofs & ceilings
    • General air tightness topics
    • Ventilation Advice
    • Air Tightness Training & Consultation
    • Air Tightness Products
  • Contact
  • ONLINE SHOP
    Air Tightness at floor level  ·  14. May 2019

    Air tight wrapping of hollow core slabs

    The most clients with two storey houses do select concrete slabs (like Ducon) instead of timber joists nowadays, to achieve a better performance for sound proofing and load bearing. A common slab is still the hollow core version, which requires some attention regarding air tightness.

     

    Because of its access to the cavity, there is a risk of air infiltration into the building through the hollow cores, through the joints in between the slabs, at the junction where the ducon slab sits on the external wall and at the junction, where the slab lays alongside in front of the external wall. 

     

    The most builders and self-builders do wrap the hollow core slab with an air tightness membrane during the installation. Please select a heavy duty membrane for this purpose, because standard membranes could get torn during the installation of the floor slabs.

     

    On the following photos I´d like to show some steps, to create a good air tightness strategy for the building envelope area between the suspended ceiling and the underside of the hollow core slab.

    I´m pretty convinced that there are different strategies available and would appreciate any thoughts and comments, to develop an even better (easier) technique for the future.

    is-100

    Belgacoat Spray dark 10 liter, air tight paint


     
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     Common situation, once the hollow core slab is installed. The membrane ends somewhere loose.
     The membrane was trimmed right underneath the hollow core slab.
     This detail shows clearly one of the potential areas for air infiltration between the membrane and the wall.
     To eliminate the risk of air infiltration between wall and slab, air tight foam has been applied to cover the junction.
     Belgacoat Spray air tight paint has been sprayed after the air tight foam was completely cured.
     A second layer of Belgacoat Spray air tight paint has been applied, to create the recommended thickness of the finishing air tight layer.
     The air tight layer is finished and the metal frames for the suspended ceilings can be installed.
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