I am going to have cavity wall insulation (polystyrene beads) installed soon, my house has a suspended timber ground floor. The outer leaf is sandstone (on two sides) and rendered block on the gable ends.
On the outside there are airbricks every 2m or so which I assumed was to vent the underfloor space. However on closer inspection none of these vent to the underfloor space they simply vent the cavity.
Having been under the floorboards for a look I notice it is draughty enough down there to vent the floorboards. I think this is because there are plenty of gaps (not by design) between joists and the cavity.
I am committed to getting the CWI done as the house is very draughty and too cold. However I am concerned that the ventillation to the underfloor will be blocked because there will be no cavity airflow, and there is no ventillation by design.
I am thinking I need to add some sleeved airbricks through to the underfloor to retain airflow.
Do you agree? and how can I assess how many I would need?
Thanks,
Dan
On the outside there are airbricks every 2m or so which I assumed was to vent the underfloor space. However on closer inspection none of these vent to the underfloor space they simply vent the cavity.
Having been under the floorboards for a look I notice it is draughty enough down there to vent the floorboards. I think this is because there are plenty of gaps (not by design) between joists and the cavity.
I am committed to getting the CWI done as the house is very draughty and too cold. However I am concerned that the ventillation to the underfloor will be blocked because there will be no cavity airflow, and there is no ventillation by design.
I am thinking I need to add some sleeved airbricks through to the underfloor to retain airflow.
Do you agree? and how can I assess how many I would need?
Thanks,
Dan