Mapei Primer G can be used in this application providing the insulations boards are fixed correctly and have a cement surface, however it is recommended that the heating cables are encapsulated in Mapei Ultraplan Self-Levelling Compound (Product code 4959F) prior to the tiles being fitted.
To do this ensure the cement faced insulation boards are fixed correctly following the manufactures recommendation, prime the insulation boards with Mapei Primer G (Product Code: (5309P) and allowed to dry, then encapsulate the undertile heating element use Mapei Ultraplan Self-Levelling Compound Grey 25kg (4959F) at a minimum of 5mm ensuring a minimum of 2mm above the heating element. Allow upto 3 days for the Mapei Ultraplan Renovation Screed to fully dry before commissioning the underfloor heating system. Tile using Mapei Keraquick Tile Adhesive White 5kg, It should be noted that if the the tiles are equal to or greater than 600x600mm we would recommend incorporating Mapei Latex Plus (48884) into the Mapei Keraquick Rapid-set Flexible Adhesive White, check the packaging for correct mixing ratio.
Date published: 2017-03-21