Sawn Reg C24 Structural Timber 47mm x 200mm Length:3.6m / 3600mm / 12ft so a separate ventilation gap

so a separate ventilation gap between the underlay and insulation is not required

The MDF core cuts cleanly with a fine-toothed circular saw or jigsaw

"name": "Does pressure-treated cladding still need painting or staining

and allow it to acclimatise inside the building for at least 48 hours before fixing - this reduces movement once in place

maintaining the integrity of the fire barrier

Sawn Reg C24 Structural Timber 47mm x 200mm Length:3.6m / 3600mm / 12ft so a separate ventilation gapC24 structural timber in 47mm x 200mm (8x2) section is one of the most widely specified sizes for floor joists, roof rafters, and load bearing frames in UK construction. Sawn, kiln dried to 20% moisture content or below, and regularised for consistent sizing, this grade meets the demands of long spans and heavy loads. Specifications Material Softwood (structural carcassing timber) Grade C24 strength graded Treatment Kiln dried to 20% moisture content