REN­O­VA­TIONS AND DIY

The Daily Telegraph - Property - - Interiors - NICK BIZLEY BUILDER

QThe ply­wood un­der­neath my bath­room tiles has bro­ken, and the loose­ness has spread un­der other tiles. Can I re-ad­here the ply­wood to the floor­boards with min­i­mal ef­fort?

MA, BY EMAIL

AThe tiles are de­lam­i­nat­ing from the ply­wood sub­strate. This is due to move­ment re­sult­ing from what could be a host of is­sues.

In my ex­pe­ri­ence, any ef­forts made to per­form lo­calised re­pairs to a mov­ing tiled floor sub­strate are gen­er­ally short-lived. In your case, and in the case of any­one wish­ing to lay floor tiles di­rectly on to a ply­wood sub­strate, there are some key points to note and fol­low.

The ideal method is to re­move the floor­boards and fix a 22mm marine

You could re-lay the tiles on specif­i­cally de­signed in­terim lay­ers

ply­wood sub­strate di­rectly to the floor joists at 200mm screw cen­tres. Prior to ad­her­ing the tiles, it is also ad­vis­able to ap­ply a PVA so­lu­tion to im­prove ad­he­sion and pre­vent against mois­ture from the ad­he­sive mix be­ing drawn into the ply­wood. Fi­nally, in the case of both the ad­he­sive and grout, a pre­mix pow­der or flex­i­ble ad­di­tive should be used. You could also re-lay the tiles on specif­i­cally de­signed in­terim lay­ers.

Nick Bizley co-founded as­pect.co.uk, the Lon­don-based main­te­nance and re­fur­bish­ment com­pany

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