Open cell vs closed cell material

 

The following matrix outlines which material is recommended in a variety of applications.

Domestic/residential
Closed
Open
Pitched tiled roof with breather membrane ✔*
Pitched tiled roof with sarking felt ✔** ✔**
Pitched tiled roof with no felt or membrane
Pitched roof above a loft space ✖***
Flat roof
Timber framed wall
Masonry cavity wall
Solid masonry wall
Suspended timber floor
Solid concrete ground floor

 

Commercial/Agricultural
Closed
Open
Steel clad roof or wall
Cold/refrigerated store
External roof insulation/waterproofing
Swimming pool hall
Narrowboat
Storage container
Marine buoyancy

 

* Roof must have counter-battens
** Check with manufacturer re ventilation/vapour control layer requirements
*** Open cell foam is NOT Class 1 to BS476 Part 7 as required by UK Building Regulations