Frequently Asked Questions (FAQ)

The following example illustrates this process, with Keraflex Super thin-set mortar, a 1/4" x  1/4" x 1/4" (6 x 6 x 6 mm) trowel for installing  Mapeheat Membrane, plus filling the  membrane and installing the tiles with a  1/2" x 1/2" x 1/2" (12 x 12 x 12 mm) trowel.*

In this example the total floorspace requiring  coverage is 250 square feet (23.2 m²). To  determine how many bags of Keraflex Super is needed to install tile over Mapeheat  Membrane, we need to add the amounts from three separate calculations:

a) Installation of Mapeheat Membrane with a 1/4" x 1/4" x 1/4" (6 x 6 x 6 mm) trowel (with Keraflex Super):
At the per-bag minimum coverage of 100 sq. ft. (9.29 m²),

b) Filling of Mapeheat Membrane (with Keraflex Super)
At the per-bag minimum coverage of 60 sq. ft. (5.57 m²),

c) Installation of tiles (with Keraflex Super)
At the per-bag minimum coverage of 50 sq. ft. (4.65 m²),

Total = 12 bags of Keraflex Super

For additional helpful tips and product  information, visit www.mapei.ca or contact  MAPEI’s Technical Services Product  Support Team.

* Note that the amounts of coverage for each recommended trowel are available on the Technical Data Sheets of MAPEI's thin-set mortars.

When going over membranes, check the Technical Data Sheet of the thin-set mortar for proper water ratios, as  additional water may be required.