Use either a thick bed solid bed trowel or a solid bed tipped trowel; either trowel will give a finished bed depth of approximately 4mm once the ribs are collapsed.
Dunlop Set Fast Plus
Plywood Overlay:- use exterior grade plywood (at least 15mm thick) which should be screwed down at 300mm centres to an existing timber floor to ensure full support. Prime with a suitable primer such as DUNLOP UNIVERSAL BONDING AGENT.
If the overlay is less than 15mm thick then use Dunlop 2-Part Rapidset Flex.
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