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Floor prep for screed inbetween joists
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[QUOTE="Ajax123, post: 951508, member: 12267"] I've done loads of screed between just floors with gypsol screed. In fact did one only last week. The only one I've done with no over boarding was my own. I actually went 25mm over the top to meet the floor boards height in the adjacent floor. It was an old house with 4x2 pitched pine joists spanning 4.5m total but with a supporting honeycomb wall halfway over so about 2.2m clear spans. Had to look up loading tables and do my own defection calcs etc cos could not find a single engineer to calc it for me. Screed between joists constitutes a dead weight so all load is supported by adjacent joists which stresses the joists individually. If the screed is over the tops if the joists it becomes a composite system and works vettercwuthout heed for overboarding. I placed 45mm screed with underfloor heating 16mm pipes (20mm between and 25mm over the top of the joists) over polythene stapled and taped to 12mm OSB supported on tile batten screwed between joists and underlaid with insulation supported from the underneath with tile batten screwed upward into the bottom of the joists. I didnt tile the floor but in 6 years living on it when we replaced the laminate before we moved there wasng a single crack. I reckon that couldve been tiled. [/QUOTE]
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Floor prep for screed inbetween joists
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