TrussForte RENDALOK® FIRE PROOFING is a galvanized steel lathing (metalath) expanded metal mesh used as a base or key for supporting fire proofing sprays on steel columns and beams in fire rated construction projects. It has a mass per unit area of 1.84 kg/m2 (3.4 lbs/sq. yard), and greater than 98 meshes per meter along the Short Way Measurement (SWM).
TrussForte RENDALOK® FIRE PROOFING can be fixed to steel or timber building frames, using non-corrosive self drilling screws for steel and galvanized flat head nails for timber.
TrussForte RENDALOK® FIRE PROOFING should be installed with the long dimension of the mesh across the studs, and the sheets should be fixed so that the strands all slope DOWNWARDS and INWARDS. Lapping ends should not be less than 25 mm, and sides not less than 12 mm. Tie laps with 1.25 mm galvanized wire every 150 mm.
Fasten to the background at edges and at supports at a maximum of 150 mm centres. Place fixings in the corners of the mesh diamonds ensuring the heads cover two strands.
Ensure that sheets do not finish on corners, but bend them at right angles to finish at least 150 mm on adjoining surfaces.