Junction function
Reverse variant of the mixed joint = GS insPIRe groove + GS MW tongue. Vs. the previous detail (MW groove + insPIRe tongue):
- The insPIRe groove has different geometry than MW — it does not fit a standard MW tongue.
- MW tongue modification required by removal/sanding.
Practical procedure:
- Measure the GS insPIRe groove — typically 30–40 mm deep, 80–100 mm wide.
- Remove the GS MW tongue — utility knife (thin tongue up to 50 mm) or router (thicker ones).
- Sand the edges with 80–120 grit paper for smoothness.
- Slide the modified MW panel into the insPIRe groove.
Critical installation aspects
- On-site operation — requires a prepared station with a router + sanding paper; not feasible at typical installation pace.
- Only for advanced installation crews — improper sanding will damage the mineral wool and reduce panel load-bearing capacity.
- Standard fixing — self-drilling fasteners through the panels into the supporting structure; no special requirements.
- Reduced airtightness — greater than in the MW groove + insPIRe tongue variant (site-modified tongue ≠ factory geometry); class 2 maximum.
- NOT recommended for air-conditioned halls / cold stores — factory geometry is required.
Used in rare unplanned retrofits — e.g. replacement of a damaged insPIRe segment with MW (when MW is more readily available).
Documentation
Technical Catalogue GS MW S/CH/U (Gór-Stal 2025), page 88 — Joint of GS insPIRe groove with GS MW tongue. Scale 1:5.