- For most standard installations
- Fast setting even in cold weather
- Exceeds ANSI A118.4 and A118.11
Coverage Chart
SQUARE FOOT COVERAGE PER 50 LB BAG (SQUARE METER PER 22.68 KG)
Chart for estimating purposes. Coverage may vary based on installation practices and jobsite conditions. For more trowel sizes, please use the material calculator at CustomBuildingProducts.com or contact CUSTOM Technical Services at (800)282-8786.
Mortar coverage between the substrate and tile underside is required to be ≥80% for dry areas and ≥95% for wet areas and exteriors with all tile edges properly supported with mortar and in a minimum of 3/32” (2.38 mm) and a maximum of ¼” (6mm) for mortars without an ANSI “H” rating. Note: Larger tiles, tiles with deep underside patterns and ungauged natural stone tiles may require larger notch sizes and may need to be flat back-troweled (formerly back buttered) or notched-back troweled to achieve proper coverage and mortar support. CUSTOM recommends testing to confirm adequate bonding mortar coverage.
When back troweling, consider the tile’s underside pattern and depth to estimate thickness and usage to add to your estimate. For achieving proper mortar coverage see the following video: Trowel & Error. (Also available in Spanish and Russian.) For information
For achieving proper mortar coverage see the following video: Trowel & Error. (Also available in Spanish and Russian.) For information regarding back troweling, refer to The National Tile Contractors Association / Reference Manual & Flat Back & Notched Back - Troweling (TileTVS3 22 08).
| Trowel Size |
Min Coverage |
Max Coverage |
| 1/4" x 1/4" x 1/4" (6 x 6 x 6 mm) Square-Notch |
85 sq. ft. (8.8 M²) |
95 sq. ft. (8.8 M²) |
| 1/4" x 3/8" x 1/4" (6 x 9.5 x 6 mm) Square-Notch |
60 sq. ft. (5.6 M² |
67 sq. ft. (6.2 M²) |
