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Finished floor level - glue depth?


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Hi, I’m approaching sorting the floor out on the ground floor of my self build. The FFL build up consists of:

100mm insulation 

75mm screed

30mm floor covering.

205mm total


The wife wants engineered herringbone, researched it and most recommend glueing it down. Most the samples are 15mm thick, and I’m assuming 5mm of adhesive? Does this sound correct? 


Has you’ve noticed I’m shy 10mm for the FFL. Do I, 1.lay an additional 20mm of insulation, and reduce screed depth by 10mm. Or, 2. Leave insulation at 100mm, and increase depth of screed to 85mm?


Any advice would be gratefully received 






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