Unventilated applications
Rockpanel products with a vapour-open structure, like Rockpanel Colours, can be used in unventilated structures such as:
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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 7 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 4 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 according the BBA approval. At vertical joints a 3 mm by 60 mm EPDM self-adhesive foam gasket should be used.
Always contact us for advice about using Rockpanel in an unventilated application.
