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Technical notes — LSW Corp

01Technical notes

What we have learned.

Selection guides, drawings and test data from our engineers — the detail behind each product.

Construction Modular lengths and the T40 flat rail The T40 section is 40 × 7 mm with a formed T profile. Its job is to take the board joint on a straight line and to make the cut list predictable. Read → Selection The full component list for one partition project A dry partition is a kit of eight or nine parts, not a wall of three. Missing one of the small ones is what turns a system into a site improvisation. Read → Materials Rock wool or glass wool for partition cavities Both are mineral wools and both absorb sound. The difference is density, fibre structure and how the material behaves when the cavity is only 40 mm deep. Read → Materials Calcium silicate board: A1 fire rating, 800 N pull-out The base board in most hospital and office partitions is a calcium silicate sheet. The numbers that matter are fire class, density, moisture movement and screw holding. Read → Materials Fire board: rated walls and steel encasement A fire board is not just a board with a certificate. Density, shrinkage under heat and thermal conductivity decide whether the assembly holds its rating. Read → Materials Waterproof backing board under tile In a prefabricated bathroom the tile needs a substrate that is flat, waterproof and machinable. A closed-cell composite board does all three, and can be curved. Read → Materials The 33 mm sandwich module at 17 kg/m² A finished wall panel that arrives with its decoration already on: 6 mm backing, aluminium frame, 20 mm acoustic layer, 6 mm decorated face. Read → Comparison Service separation: why cables should not be chased into a wall Cutting a channel in a finished wall is the fastest way to build a wall that leaks sound, cracks, and cannot be changed. A cavity does the same job without the damage. Read → Comparison Dry partition vs blockwork: the flatness gap Flatness is not a cosmetic detail — it decides whether the finish can be thin, whether large-format tile lies flat, and how much filler the painter uses. Read → Comparison Tall partitions without ring beams or tie columns A masonry wall above a certain height needs secondary structure. A framed dry wall gets its stability from the frame itself — if the frame is designed for it. Read → Comparison Secondary structure and the problem with wet joints Every wet joint in a partition is a place where two materials meet, cure at different rates and move differently. That is where cracks and sound leaks start. Read → Comparison Construction waste targets and the dry partition Policy now sets a waste ceiling per 10,000 m² of floor area. A partition that arrives cut to size produces a fraction of the waste of one built from mortar and blocks. Read →