This site uses javascript, some functionality and content is not working if javascript is disabled

Unventilated applications

Thanks to its unique production process and the characteristics of the raw material, basalt rock, ROCKPANEL can produce unique boards with a vapour open coating, perfect for use in non-ventilated building applications.

ROCKPANEL Rockclad (without ProtectPlus) has a vapour-open structure and can be used in unventilated structures such as:

  • infilling
  • dormers (side walls)
  • soffits
  • fascia boards
  • and other detailing

When using ROCKPANEL for unventilated applications, ventilated glass beading and a ventilation space between the ROCKPANEL and the insulation are not required. This therefore means that:

  • there is additional space for thicker and thus more effective insulation
  • the structure can be made narrower using the same thickness of insulation

In certain cases, ROCKPANEL can be fitted directly onto the existing structure.

For non-ventilated applications of ROCKPANEL Rockclad (without ProtectPlus) following pre-conditions are required:

  • interior climate with a maximum vapour pressure of 1330 Pa (normal housing);
  • the sd values of the materials on the inside of the structure down to the insulation should sum up to at least 10 m; this value can be achieved with a 0.15 m-thick PE membrane as vapour barrier and drywall;
  • the sd values of the materials on the outside of the structure down to the insulation should not amount to more than 2,5 m;
  • the inside of the structure should be airtight so that no warm air (with many grams of moisture per m3) can penetrate the structure;
  • the attachments of the boards to the structure should be water-tight, so that no rainwater or cleaning water can get behind the cladding. Due to this, horizontal joints are not allowed. At vertical joints a 3 mm by 60 mm EPDM self-adhesive foam gasket should be used.

If you are unsure whether you are able to meet these conditions, please contact ROCKPANEL.


Wern Tarw
Pencoed Bridgend
CF35 6NY
Tel.: +44 (1656) 863 210
Fax: +44 (1656) 863 611
Find your local ROCKPANEL dealer

or follow/join ROCKPANEL on:


Join Rockpanel on LinkedIn


Follow Rockpanel on Twitter


Rockpanel board material for facade cladding and roof detailing
Print Share